Petroelastic Modeling of Complex Lithology Fields: Case Study

2021 ◽  
Author(s):  
Anastasiia Spirina ◽  
Evgeniy Cherepanov
Keyword(s):  
Pore Space ◽  
Complex Structure ◽  
Geophysical Methods ◽  
Core Sample ◽  
Reservoir Properties ◽  
Production Water ◽  
High Production ◽  
Water Cut ◽  
Effective Models ◽  
Component Models

Abstract The present-day growth of petroleum reserves, maintaining and enhancing of oil production is associated with involving of complex fields into production (Uspenskaya, 2014). The complex structure of the study areas of the Urai Region (facies variability, formation replacement, fracturing, crushing and cleavage zones, complicated structure of the pore space) makes conventional forecast of reservoir properties ineffective. Moreover, the pay formations are highly exhausted with high production water cut. Therefore, the search of prospective targets is relevant in the Urai Region. The article shows generalized results of petroelastic modeling of several fields of the Urai Region for solving the following tasks: ○ Lithology, saturation and poroperm properties forecast of reservoir rocks from log and seismic data; ○ Development of 1D mechanical earth models (MEM) of horizontal well sections and their maintenance while drilling horizontal wells. The approach is based on the principles of integrating different-scale geological and geophysical studies. The lithological division of rocks was carried out, the saturation behavior and point-by-point interpretation of the data of geophysical methods of well logging (WL) were identified. 3D component models were built with taking into account the lithological features of the section using core sample studies. Effective models for the environment of sediments of interest were selected and petroelastic modeling was carried out.

Geophysical methods for determining the reservoir properties of complexly constructed Lower and Middle Jurassic deposits within the oil-gas fields of the Ob River Region

2020 ◽  
pp. 37-41
Author(s):  
V. V. Shelepov ◽  
O. V. Tyukavkina
Keyword(s):  
Middle Jurassic ◽  
Complex Structure ◽  
Geophysical Methods ◽  
Extended Period ◽  
Reservoir Properties ◽  
River Region ◽  
Geophysical Information ◽  
High Average Number ◽  
Gas Fields ◽  
Oil Gas

This paper discusses the use of geophysical well logging for the interpretation of complex structure oil-saturated intervals of the Lower and Middle Jurassic horizons with high average number of permeable intervals, the content of minerals — semiconductors (pyrite, siderite, glauconite, et al.) for structuring a complex of geological and geophysical information and developing a researching methodology of areas with hard to recover reserves on example of deposits which was in operation for an extended period of time.

scholarly journals Geophysical methods of oil and gas exploration in cambrian and precambrian sedimentary rocks of the Siberian Platform

1989 ◽  
Vol 20 (2) ◽  
pp. 37
Author(s):  
M.M. Mandelbaum ◽  
A.I. Shamal
Keyword(s):  
Siberian Platform ◽  
Seismic Data ◽  
Oil And Gas ◽  
Complex Structure ◽  
Geophysical Methods ◽  
Reservoir Properties ◽  
Oil And Gas Exploration ◽  
Salt Complex ◽  
Abrupt Changes ◽  
Low Amplitude

The Siberian Platform is the largest hydrocarbon-bearing sedimentary basin in the USSR. The conditions encountered in geophysical exploration in this basin are uniquely difficult. This very old sedimentary complex is characterised by abrupt changes in physical properties reflecting the presence of dolerites and tuffs, changes in salt thickness, and complex structure. Petroleum traps are controlled by low amplitude structures in the salt complex, although reservoir properties are variable, so that most traps are stratigraphic. This leads to the use of frequency content of seismic data to identify traps and electrical and time domain EM techniques to confirm the presence of the traps.

Integrated reservoir characterization: Beyond tomography

Geophysics ◽  
1995 ◽  
Vol 60 (2) ◽  
pp. 354-364 ◽  
Author(s):  
Larry Lines ◽  
Henry Tan ◽  
Sven Treitel ◽  
John Beck ◽  
Richard Chambers ◽  
...  
Keyword(s):  
History Matching ◽  
Preferential Flow ◽  
Reservoir Characterization ◽  
Seismic Anisotropy ◽  
Flow Direction ◽  
Geophysical Methods ◽  
Reservoir Properties ◽  
Traveltime Tomography ◽  
Sonic Log ◽  
Primary Water

In 1992, there was a collaborative effort in reservoir geophysics involving Amoco, Conoco, Schlumberger, and Stanford University in an attempt to delineate variations in reservoir properties of the Grayburg unit in a West Texas [Formula: see text] pilot at North Cowden Field. Our objective was to go beyond traveltime tomography in characterizing reservoir heterogeneity and flow anisotropy. This effort involved a comprehensive set of measurements to do traveltime tomography, to image reflectors, to analyze channel waves for reservoir continuity, to study shear‐wave splitting for borehole stress‐pattern estimation, and to do seismic anisotropy analysis. All these studies were combined with 3-D surface seismic data and with sonic log interpretation. The results are to be validated in the future with cores and engineering data by history matching of primary, water, and [Formula: see text] injection performance. The implementation of these procedures should provide critical information on reservoir heterogeneities and preferential flow direction. Geophysical methods generally indicated a continuous reservoir zone between wells.

Cable Thru Downhole Insert Safety Valve: A New Paradigm

2021 ◽  
Author(s):  
Kuswanto Kuswanto ◽  
Oka Fabian ◽  
Orient B Samuel ◽  
Mohd Yuzmanizeil B Yaakub ◽  
Chua Hing Leong ◽  
...  
Keyword(s):  
Safety Valve ◽  
Cost Effective ◽  
Submersible Pump ◽  
New Paradigm ◽  
Reservoir Properties ◽  
Technology Application ◽  
Artificial Lift ◽  
Water Cut ◽  
The Right ◽  
Gas Lift

Abstract The B Field is located in the South China Sea, about 45 KM offshore Sarawak, Malaysia, in a water depth approximately 230 ft. Its structure is generally regarded as a gentle rollover anticline with collapsed crest resulting from growth faulting. The reservoirs were deposited in a coastal to shallow marine with some channels observed. Multiple stacked reservoirs consist of a series of very thick stacked alternating sandstone and minor shale layers with differing reservoir properties. The shallow zones are unconsolidated, and the wells were completed with internal gravel packs. Wells in B Field mostly were completed in multi-layered reservoirs as dual strings with SSDs and meant to produce as a commingled production. The well BX is located within B Field and designed as oil producer well with a conventional tubing jointedElectrical Submersible Pump (ESP) system which was installed back in 2008. Refer to figure 1, the initial completion schematic is 3-1/2″ single string that consist of the single production packer, gas lift mandrel, tubing retrievable Surface Controlled Subsurface Safety Valve (SCSSV) and ESP. The production packers equipped with the feed thru design to accommodate the ESP cable and the gas vent valve as part of the ESP completion design. The gas lift mandrel was installed in the completion string as a backup artificial lift method to receive the gas lift and orifice valve in the event of the conventional ESP failed. Hence the well still able to produce by introducing the gas thru the annulus to activate the gas lift valve. Eventually throughout the end of the the field life, the well would depend on the ESP system for the primary lifting method due to gas lift depth limitation and the gas supply. The conventional ESP failed after seven years of operation which is above the average ESP lifetime. The well last produced at a flow rate with 28 % water cut, however the well is not at the end of the field life. Based on the economical study with the right technology and cost efficient approach, the well still economicaly profitable. The Thru Tubing (TT) ESP technology is approached as cost effective solution compare to fully well workover. Despite a couple of operational challenges, for example, setting the cable hanger, maintaining downhole barrier requirement, the Thru Tubing Electrical Submersible Pump Cable Deployed (TTESP CD) and Cable Thru Insert Safety Valve (CT-ISV) was successfully installed. Several post-installation findings have uncovered some problems which are requiring some additional technical and operation improvement for future similar applications. This paper will highlight the deployment of the Cable Thru Insert Safety Valve (CT-ISV) that was successfully installed as pilot, which is the first application in the world, and also highlights the success, lesson learnt and improvement for future requirement for the CT-ISV application as one of the solution for retrofitting completion application without jeopardizing the well integrity. This achievement is collaboration between Company and service partner as the technology and deployment under the proprietary scope. Further technology application, the replication of this insert safety valve was conducted and successfully deployed on other three wells.

Effets de la texture petrographique sur les proprietes petrophysiques d'un calcaire en zone de diagenese meteorique (calcaire oligocene d'Aquitaine, France)

2000 ◽  
Vol 171 (4) ◽  
pp. 419-430 ◽  
Author(s):  
Adrian Cerepi ◽  
Louis Humbert ◽  
Rene Burlot
Keyword(s):  
Porous Medium ◽  
Specific Surface ◽  
Pore Space ◽  
Space Complexity ◽  
Petrophysical Properties ◽  
Chemical Analyses ◽  
Reservoir Properties

Abstract 120 samples of three quarries of the Oligocene Aquitaine limestone were subjected to petrographic, petrophysical and chemical analyses. Strong variations of depositional and diagenetic textures were observed. Four main depositional textures characterize this limestone: mudstone-wackestone, packstone, packstone-grainstone and grainstone. The diagenetic transformations recognized and specially meteoric leaching increases the heterogeneity of porous medium. The "Pierre de Bordeaux" shows a high variation of porosity (12,8 % to 42,51%), permeability (4,27 to 4755 mD), specific surface (0,78 to 3,73 m 2 /g) and distribution of pore throats (from monomodal to three modal distribution). Petrophysical properties depend strongly on depositional and diagenetic patterns. Textures with two and three modal distribution of porous medium, packstone-grainstone and grainstone have the best reservoir properties. The meteoric dissolution associated to microfracturing improves strongly both the macroporosity, permeability in mudstone-wackestone and packstone and increases the pore space complexity in all textures.

Important Factors to Propose High-Produced New Development Wells in CBM Project

2014 ◽  
Vol 1030-1032 ◽  
pp. 2578-2581
Author(s):  
Zhao Hui Xia ◽  
Ming Zhang ◽  
Bin Ren ◽  
Liang Chao Qu ◽  
Ze Hong Cui ◽  
...  
Keyword(s):  
Coal Seam ◽  
3D Model ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Seams ◽  
Reservoir Properties ◽  
Well Design ◽  
New Development ◽  
Reservoir Type ◽  
High Production

Coal bed methane (CBM) is a kind of natural gas that generated from coal and disseminated organic matters during the stage of diagenesis and coalification, which mainly composed of methane and hosted in coal seam by free, adsorbed, and dissolved forms. Genetic, reservoir type and occurrence condition in CBM are different from traditional reservoir. And the high-produced development wells in CBM aiming to drill more coal seams with high quality therefore needs to be analyzed in the methods that are different from traditional reservoir. 3 important factors including the study on correlation and elevation depth of coal seam roof and floor in section and areal by using well-seismic ties, outcrop boundary based on coal mine data and distributions of CBM reservoir properties in 3D model are needed for high-produced development well analyze in CBM. Application in Australia CBM project shows this methodology is very successful for the development well design with high production.

Image-Based Petrophysical Parameters: CT Imaging of Chalk Cuttings and Experimental Comparisons by Plug-Size Upscaling

SPE Journal ◽  
2016 ◽  
Vol 22 (01) ◽  
pp. 41-52 ◽  
Author(s):  
Jakob Noe-Nygaard ◽  
Finn Engstrøm ◽  
Theis I. Sølling ◽  
Sven Roth
Keyword(s):  
Pore Space ◽  
Complex Structure ◽  
Ct Imaging ◽  
Low Permeability ◽  
Micro Ct ◽  
Two Phase ◽  
Petrophysical Parameters ◽  
Root Cause ◽  
Sufficient Detail ◽  
Experimental Comparisons

Summary In the present study, the focus is on two 2- to 3-mm cuttings-scale reservoir chalk samples chosen such that the resolution of the pore space is challenging the state of the art and the permeability differs by a factor of four. We compare the petrophysical parameters that are derived from nano-computed-tomography (nano-CT) images of trim sections and cuttings. Moreover, the trim-section results are upscaled to trim size to form the basis of an additional comparison. The results are also benchmarked against conventional core analysis (CCAL) results on trim-size samples. The comparison shows that petrophysical parameters from CT imaging agree reasonably well with those determined experimentally. The upscaled results show some discrepancy with the nano-CT results, particularly in the case of the low-permeability plug. This is probably because of the challenge in finding a representative subvolume. For the cuttings, the differences are significant for the low-permeability plug. For the two-phase-flow data, the predicted relative permeability endpoints differ significantly. The root cause of this again is attributed to the more-complex structure of the pore network in the low-permeability carbonate. The experiment was also run directly from the micro-CT results on a cutting measured on an in-house instrument; the results clearly show that micro-CT measurements on chalk do not capture the pore space with sufficient detail to be predictive. Overall, with the appropriate resolution, the present study shows that it is indeed feasible to obtain petrophysical parameters from imaging experiments on cuttings.

scholarly journals Geophysical monitoring of the development of stress-deformed ore massives

2021 ◽  
Author(s):  
В.И. Голик ◽  
О.Г. Бурдзиева ◽  
Б.В. Дзеранов
Keyword(s):  
Rock Mass ◽  
Complex Structure ◽  
Geophysical Methods ◽  
Practical Experience ◽  
The State ◽  
Theory And Practice ◽  
Structure Theory ◽  
Nature Management ◽  
Reliability Factor ◽  
Communication Processes

Рассмотрены актуальные вопросы рационализации природопользования, включающие в себя установление величины и закономерностей экологического риска технологических процессов, оценку процессов коммуникации техногенных продуктов и прогнозирование экологической зависимости биоты от горного производства при подземной разработке месторождений Садонского рудного узла. Целью исследований является определение форм взаимодействия природных и технических систем, определяющих параметры геомеханики участка земной коры в районе освоения недр путем исследования напряженно-деформированного состояния массивов для разработки приемлемых вариантов добычи металлических руд. Методы исследования. Приведены результаты моделирования состояния рудовмещающих массивов на оптически активных материалах. Предложен коэффициент надежности для оценки безопасности горных технологий по развитию критических напряжений и деформаций. Результаты работы. Установлена адекватная зависимость между характером силового воздействия на природные и искусственные массивы и их устойчивостью с корреляцией между напряженностью массива и сохранностью земной поверхности, как гаранта безопасности экосистем биосферы. Даны результаты моделирования напряженности массива методом конечных элементов, распределения давления по контуру выработки на крепь и исследования фильтрационной неоднородности руд. Обобщены результаты анализа ретро-и перспектив развития способов управления состоянием массивов при разработке месторождений. Сделан вывод о возможности обеспечения оптимального соотношения напряжений в элементах геомеханической системы геофизическими методами в рамках мониторинга состояния горного массива и подземных выработок. В совокупности рекомендации представляют собой программу выхода горных предприятий региона из затяжного кризиса и восстановления былого потенциала одного из флагманов цветной металлургии, реализация которой формирует экономический, экологический и социальный эффект в условиях депрессивного промышленного региона. Topical issues of rationalization of nature management are considered, including the establishment of the magnitude and regularities of the ecological risk of technological processes, the assessment of the communication processes of technogenic products and the prediction of the ecological dependence of biota on mining during the underground development of the deposits of the Sadonsky ore cluster. The Aim of the research is to comprehensively study the interaction of natural and technical systems that ensure the geomechanical balance of massifs in the area of subsoil development by systematic monitoring of the stress-strain state of the massifs using the methods of complex generalization, analysis of practical experience and scientific achievements in the field of underground ore mining in the massifs. Complex structure, theory and practice of destruction of solid media by means of continuum mechanics and mathematical statistics with the development of economically and environmentally acceptable options for the extraction of metal ores. Methods. The results of modeling the state of ore-bearing massifs on optically active materials are presented. A reliability factor is proposed for assessing the safety of mining technologies for the development of critical stresses and deformations. Results. An adequate relationship has been established between the nature of the force impact on natural and artificial massifs and their stability with the correlation between the strength of the massif and the safety of the earth's surface, as a guarantor of the safety of biosphere ecosystems. The results of modeling the tension of the massif by the finite element method, the distribution of pressure along the contour of the excavation on the support and the study of the filtration heterogeneity of ores crushed for leaching purposes according to the propagation velocity of stress waves are given. The results of the analysis of retro- and prospects for the development of methods for managing the state of rock mass in the development of fields are generalized. A conclusion is made about the possibility of ensuring the optimal stress ratio in the elements of the geomechanical system by geophysical methods within the framework of monitoring the state of the rock mass and underground workings. Taken together, the recommendations represent a program for the recovery of the region's mining enterprises from a protracted crisis and the restoration of the former potential of one of the flagships of non-ferrous metallurgy, the implementation of which creates an economic, environmental and social effect in a depressed industrial region.

scholarly journals Refinement of the petrophysical model of the Achimov formation based on facial analysis of sedimentation conditions

2021 ◽  
Vol 6 (4) ◽  
pp. 22-31
Author(s):  
Guzel R. Vahitova ◽  
Anzhela A. Kazaryan ◽  
Timur F. Khaybullin
Keyword(s):  
Oil And Gas ◽  
Facies Analysis ◽  
Pore Space ◽  
Sedimentary Cover ◽  
Clay Content ◽  
Geological Structure ◽  
Space Structure ◽  
Reservoir Properties ◽  
The Core ◽  
Promising Source

Aim. Due to the depletion of reserves of the main oil and gas complexes, the greatest interest is attributed to hard-to-recover reserves, complex-built objects of the sedimentary cover, the development of which was unprofitable until recently. One of these is the oil-bearing complex of the Achimov deposits of the Malobalykskoye field in Western Siberia. This article is devoted to the facies analysis and typification of reservoir rocks of the Achimov deposits in order to increase the reliability of determining the boundaries of the reservoirs, their interpretation and assessment of the petrophysical properties of the reservoirs. At the same time, special attention is paid to the facies analysis, which determines the characteristics of the reservoir. The Achimov deposits are a promising source of increasing resources and maintaining production at a high level. With their increasing importance, there are problems that complicate the search and assessment of deposits. Such problems include a high degree of reservoir compartmentalization, sharp facies variability, complex pore space structure, high clay content, low permeability values, etc. Materials and methods. The work is based on a comprehensive interpretation of the data of the lithological description of the core, the results of laboratory studies of the core and well logging data analysis of the Achimov deposits of the Malobalykskoye field. The methods used in the interpretation of GIS data, statistical analysis, comparison. Due to the fact that the reservoir properties of sand bodies are determined by the peculiarities of their formation in different conditions of sedimentation, it is necessary to establish a relationship between the petrophysical characteristics of rocks and their facies nature by substantiating petrofacies models. The use of the latter in geological modeling makes it possible to more effectively predict the reservoir properties (reservoir properties) of various facies lithotypes. Results. The paper presents the results of facies analysis and typification of the reservoirs of the Achimov deposits of the Malobalykskoye field, on the basis of which the boundaries of the reservoirs and the effective oilsaturated thicknesses were refined. Conclusions. Based on the results of the study, it can be concluded that it is necessary to develop refined petrophysical models for reservoirs with complex geological structure that take into account the facies features of rocks.

scholarly journals Application of geophysical methods in the extrapolation of sedimentological data on unmastered areas of deposits (on the example of Pennsylvanian carbonate reservoir, Akanskoye oilfield, east of Russian Platform)

2021 ◽  
pp. 128-134
Author(s):  
B. V. Platov ◽  
◽  
A. N. Kolchugin ◽  
E. A. Korolev ◽  
D. S. Nikolaev ◽  
...  
Keyword(s):  
Seismic Data ◽  
Geophysical Methods ◽  
Russian Platform ◽  
Carbonate Reservoir ◽  
Reservoir Properties ◽  
Reservoir Characteristics ◽  
The North ◽  
Study Results ◽  
Core Study ◽  
Well Data

A feature of the oil-bearing carbonate deposits of the lower Pennsylvanian in the east of the Russian platform is their rapid vertical and horizontal change. It is often difficult to make correlations between sections, especially in the absence of core data when using only geophysical data. In addition, not all facies are reliably identified and traceable from log data and not all have high reservoir properties. Authors made an attempt to trace the promising facies both to adjacent wells and, in general, to the entire field area using core study results and translation of these results using log and seismic data. The data showed pinching of rocks with high reservoir characteristics in the direction of the selected profile (from south to north within the field). Coastal shallow water facies, represented by Grainstones and Packstones, with high reservoir properties in the south of the field, are replaced by lagoon facies and facies of subaerial exposures, represented by Wakestones and Mudstones with low reservoir characteristics, in the north of the field. The authors suggest that this approach can be applicable for rocks both in this region and for areas with a similar structure. Keywords: pinch-out; well data; seismic data; limestone; facies; reservoir rocks.

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