Carbonate reservoirs and seismic attributes: How far can they go together?

1997 ◽  
Author(s):  
Mariangela Capello de P ◽  
Ezequiel Gonzalez ◽  
Reinaldo J. Michelena
Keyword(s):  
Seismic Attributes ◽  
Carbonate Reservoirs

Application of Techniques of Natural Fracture Characterization for Appraisal of Tight Carbonate Reservoirs: A Case Study From Jurassic of Kuwait

2021 ◽  
Author(s):  
Aishah Khalid Abdullah ◽  
Bhaskar Chakrabarti ◽  
Anas Mansor Al-Rukaibi ◽  
Talal Fahad Hadi Al-Adwani ◽  
Khushboo Havelia ◽  
...  
Keyword(s):  
Seismic Attributes ◽  
Carbonate Reservoirs ◽  
Fracture Model ◽  
Fracture Aperture ◽  
Structural Restoration ◽  
Fracture Characterization ◽  
Fracture Porosity ◽  
Tight Carbonate ◽  
Porosity And Permeability ◽  
Sweet Spots

Abstract The State of Kuwait is currently appraising and successfully developing the tight carbonates reservoirs of Jurassic age, which have very low matrix porosity and permeability. These reservoirs are affected by several tectonic events of faulting and folding, resulting in the development of interconnected natural fractures, which provide effective permeability to the reservoirs in form of production sweet spots. The objective of the study was to characterize the natural fractures and identify high permeability sweet spots as being appraisal drilling locations in a discovered field with tight carbonate reservoirs. An integrated approach was undertaken for building a discrete fracture network model by characterizing the developed faulting- and folding-related fractures and combining all subsurface data from multiple domains. The reservoir structure has a doubly plunging anticline at the field level that is affected by several strike-slip faults. The faulting-related fractures were characterized by generating multiple structural seismic attributes, highlighting subsurface discontinuities and fracture corridors. The folding-related fractures were modelled using structural restoration techniques by computing stresses resulting from the anticlinal folding. The fracture model was built in addition to the 3D matrix property model for this tight carbonate reservoir, resulting in a dual-porosity-permeability static model. Analogue data was used to compute fracture aperture and expected fracture porosity and permeability, to identify the sweet spots. Structural seismic attributes such as Ant Tracking and Consistent Dip were successful in highlighting and identifying the fault lineaments and fracture corridors. The seismic discontinuities were validated using the fractures interpreted in the image log data from the predrilled wells before being input into the fracture model. Paleo stresses, derived from structural restoration, were combined with the reservoir facies and geomechanical properties to gain important insight into predicting fractures developed due to folding. Several fracture aperture scenarios were run to capture the uncertainty associated with the computed fracture porosity and permeability. Based on the results, several sweet spots were identified, which were ranked based on their extent and connected volumes of the various permeability cases. Identifying these sweet spots helped make informed decisions regarding well planning and drilling sequence. High-inclination wells aligned parallel to the present-day maximum stress direction were proposed, which would cut across corridors of the predicted open fractures. Through this study, comprehensive fracture characterization and fracture permeability understanding of the tight carbonates in the field under study were successfully achieved. This workflow will be useful in exploratory or appraisal fields with tight carbonate reservoirs.

scholarly journals Seismic attributes and integrated prediction of fractured and caved carbonate reservoirs in the Tarim Basin, China

2011 ◽  
Vol 8 (4) ◽  
pp. 455-461 ◽  
Author(s):  
Lifeng Liu ◽  
Sam Zandong Sun ◽  
Haijun Yang ◽  
Jianfa Han ◽  
Hongliang Gao ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Seismic Attributes ◽  
Carbonate Reservoirs

scholarly journals SEISMIC ATTRIBUTES ANALYSIS OF A PERMO-POROUS SYSTEM IN NEOBARREMIAN-EOAPTIAN CARBONATES RESERVOIRS – CAMPOS BASIN (BRAZIL)

2017 ◽  
Vol 35 (2) ◽  
Author(s):  
Milena Cristina Rosa ◽  
Maria Gabriela Castillo Vincentelli
Keyword(s):  
Physical Properties ◽  
Seismic Attributes ◽  
Seismic Interpretation ◽  
Carbonate Reservoirs ◽  
Well Logs ◽  
Homogeneous Distribution ◽  
Porous System ◽  
Reservoir Level ◽  
Petrophysical Analysis ◽  
Campos Basin

ABSTRACT. The geological complexity of carbonate reservoirs formed by coquinas at the rift section of Campos and Santos basins has been directing the studies aiming efforts to understand this type of reservoir, even in an analogue form. The application of this analysis intends to help the understanding of the main physical properties distribution and the geometric permo-porous system associated to the potential reservoir levels located in carbonate reservoirs formed by coquinas in the Upper Barremian – Lower Aptian in Campos Basin. The method uses seismic attributes generated from 3D seismic and their correlation with the petrophysical property as porosity from well logs. Considering two pre-defined reservoir levels (CI-A and CS), the correlation between the main physical properties (well logs and petrophysical analysis) and the seismic attributes of amplitude and sweetness showed correlation coefficients ranging from R2≥0.7 to R2≤0.92. This integration of this petrophysical analysis with the seismic interpretation concludes that the porosity distribution at the reservoir level CI-A has higher influence of the tectonic structure, when compared to the reservoir level CS, with the best porosities (8% to 24%) following the main structures with NW-SE direction. The porosity values from reservoir level CS has a homogeneous distribution and reduces porosity towards South-Southeast, following the thickness decrease of these coquinas reservoir level. Keywords: seismic interpretation, reservoir-levels, petrophysics, coquinas. RESUMO. A complexidade geológica dos reservatórios carbonáticos formados por coquinas da seção rifte das bacias de Campos e Santos tem direcionado estudos, mesmo que de uma forma análoga, para entender a distribuição de suas principais propriedades físicas e o comportamento geométrico do seu sistema permo-poroso. O método proposto contempla o uso de atributos sísmicos que são gerados a partir de um volume sísmico de amplitude e a sua correlação com a porosidade, calculada a partir dos perfis de poço, e tem como objetivo contribuir para a definição de potenciais níveis-reservatório de interesse e na definição da geometria do sistema permo-poroso associado a reservatórios carbonáticos formados por coquinas do neobarremiano-eoaptiano da Bacia de Campos. Considerando dois níveis-reservatório predefinidos (CI-A e CS), a correlação entre as principais propriedades físicas (perfil de poço e petrofísica) e os atributos sísmicos de amplitude e Sweetness apresentaram coeficientes de correlação que vão de R2≥0.7 até R2≤0.92. Finalmente a análise da distribuição da porosidade para o nível-reservatório CI-A mostra uma alta influência da estruturação tectônica na distribuição dessa propriedade, se comparado com o nível CS, com as melhores porosidades (8% a 24%) seguindo as principais estruturas com direção NW-SE. Os valores de porosidade para o nível CS se distribuem de modo mais homogêneo e diminuem para sul e sudeste juntamente com a diminuição das espessuras dos níveis-reservatórios de coquinas. Palavras-chave: interpretação sísmica, níveis-reservatório, petrofísica, coquinas.

Efficiency improvement of foam-acid treatments and selective large-volume acidizing at carbonate reservoirs of Tatneft PJSC

2019 ◽  
Vol 11 ◽  
pp. 116-119
Author(s):  
M.Kh. Musabirov ◽  
◽  
A.Yu. Dmitrieva ◽  
R.F. Khusainov ◽  
E.M. Abusalimov ◽  
...  
Keyword(s):  
Large Volume ◽  
Carbonate Reservoirs ◽  
Efficiency Improvement ◽  
Acid Treatments
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