Present-day in-situ stresses versus paleo-stresses for locating sweet spots in unconventional reservoirs

2013 ◽  
Vol 53 (1) ◽  
pp. 217 ◽  
Author(s):  
Hani Abul Khair ◽  
Dennis Cooke ◽  
Martin Hand
Keyword(s):  
Sweet Spot ◽  
Principal Stresses ◽  
Tectonic History ◽  
In Situ Stresses ◽  
Calculated Stress ◽  
History Of ◽  
Software Codes ◽  
Sweet Spots ◽  
Element Method

The effect of stresses on permeability is a combination of external stress and pore pressure. The authors examine if and how present-day in-situ stresses and the spatial distribution of permeable locations in the Moomba-Big Lake fields in the Cooper Basin are correlated. Image logs, well logs, and formation tests are analysed and the orientation and magnitudes of the three principal stresses are calculated. A 3D model was constructed and the calculated stress magnitudes and orientations were applied to the model using the software Poly3D. The resulting stress distribution in the present-day stress state showed a potential sweet spot in the Big Lake field, which is presently the location of a gas pool that forms, with the Moomba field, one-third of the gas reserve in SA. No potential sweet spots, however, are located in the Moomba area. The authors also used the finite element method (FEM) and the boundary element method (BEM) for modelling the behaviour of folds, fractures, and faults and for mimicking the tectonic history of the basin. Software codes Dynel3D and Traptester were used to examine the validity of geomechanical restoration techniques for locating sweet spots in the Moomba-Big Lake fields. The methodology attempts to reconstruct the present-day structural and geometrical placement and to predict fractures generated due to stresses released during past tectonic events. Predicted stresses succeeded in mapping the same sweet spot in the Big Lake field using both software codes. Accordingly, the present permeability and production rate is controlled by a combination of present-day and stored stresses.

INTERPRETING REACTION HISTORIES AND P-T-T PATHS FROM IN-SITU MONAZITE AND XENOTIME PETROCHRONOLOGY: IMPLICATIONS FOR THE TECTONIC HISTORY OF NEW ENGLAND

2020 ◽  
Author(s):  
Ian W. Hillenbrand ◽  
◽  
Michael L. Williams ◽  
Michael J. Jercinovic ◽  
Daniel J. Tjapkes
Keyword(s):  
New England ◽  
Tectonic History ◽  
History Of

IN-SITU MONAZITE GEOCHRONOLOGY OF MIGMATITES IN THE SHELVING ROCK QUADRANGLE: IMPLICATIONS FOR THE TECTONIC HISTORY OF THE EASTERN ADIRONDACK HIGHLANDS, NY

2017 ◽  
Author(s):  
Claire R. Pless ◽  
◽  
Michael L. Williams ◽  
Timothy W. Grover ◽  
Ashley Smith ◽  
...  
Keyword(s):  
Tectonic History ◽  
History Of

scholarly journals Paleostress reconstruction of faults recorded in the Niedźwiedzia Cave (Sudetes): insights into Alpine intraplate tectonic of NE Bohemian Massif

2021 ◽  
Author(s):  
Artur Sobczyk ◽  
Jacek Szczygieł
Keyword(s):  
Central Europe ◽  
Bohemian Massif ◽  
Tectonic Activity ◽  
Principal Stresses ◽  
Basin Inversion ◽  
Cave System ◽  
Tectonic History ◽  
Fault Block ◽  
Riedel Shear ◽  
History Of

AbstractBrittle structures identified within the largest karstic cave of the Sudetes (the Niedźwiedzia Cave) were studied to reconstruct the paleostress driving post-Variscan tectonic activity in the NE Bohemian Massif. Individual fault population datasets, including local strike and dip of fault planes, striations, and Riedel shear, enabled us to discuss the orientation of the principal stresses tensor. The (meso) fault-slip data analysis performed both with Dihedra and an inverse method revealed two possible main opposing compressional regimes: (1) NE–SW compression with the formation of strike-slip (transpressional) faults and (2) WNW–ESE horizontal compression related to fault-block tectonics. The (older) NE-SW compression was most probably associated with the Late Cretaceous–Paleogene pan-regional basin inversion throughout Central Europe, as a reaction to ongoing African-Iberian-European convergence. Second WNW–ESE compression was active as of the Middle Miocene, at the latest, and might represent the Neogene–Quaternary tectonic regime of the NE Bohemian Massif. Exposed fault plane surfaces in a dissolution-collapse marble cave system provided insights into the Meso-Cenozoic tectonic history of the Earth’s uppermost crust in Central Europe, and were also identified as important guiding structures controlling the origin of the Niedźwiedzia Cave and the evolution of subsequent karstic conduits during the Late Cenozoic.

Regional In-Situ Stress Prediction in Frontier Exploration and Development Areas: Insights from the First-Ever 3D Geomechanical Model of the Arabian Plate

2021 ◽  
Author(s):  
Rajesh Goteti ◽  
Yaser Alzayer ◽  
Hyoungsu Baek ◽  
Yanhui Han
Keyword(s):  
Plate Boundary ◽  
In Situ Stress ◽  
Wellbore Stability ◽  
Arabian Plate ◽  
Arabian Shield ◽  
Principal Stresses ◽  
Tectonic Plate ◽  
In Situ Stresses ◽  
3D Geomechanical Model

Abstract In this paper, we present results from the first-ever 3D geomechanical model that supports pre-drill prediction of regional in-situ stresses throughout the Arabian Plate. The results can be used in various applications in the petroleum industry such as fault slip-tendency analysis, hydraulic fracture stimulation design, wellbore stability analysis and underground carbon storage. The Arabian tectonic plate originated by rifting of NE Africa to form the Red Sea and the Gulfs of Aden and Aqaba. The continental rifting was followed by the formation of collisional zones with eastern Turkey, Eurasia and the Indo-Australian Plate, which resulted in the formation of the Eastern Anatolian fault system, the fold-thrust belts of Zagros and Makran, and the Owen fracture zone. This present-day plate tectonic framework, and the ongoing movement of the Arabian continental lithosphere, exert a first-order control on the of in-situ stresses within its sedimentary basins. Using data from published studies, we developed a 3D finite element of the Arabian lithospheric plate that takes into account interaction between the complex 3D plate geometry and present-day plate boundary velocities, on elastic stress accumulation in the Arabian crust. The model geometry captures the first-order topographic features of the Arabian plate such as the Arabian shield, the Zagros Mountains and sedimentary thickness variations throughout the tectonic plate. The model results provide useful insights into the variations in in-situ stresses in sediments and crystalline basement throughout Arabia. The interaction between forces from different plate boundaries results in a complex transitional stress state (thrust/strike-slip or normal/strike-slip) in the interior regions of the plate such that the regional tectonic stress regime at any point may not be reconciled directly with the anticipated Andersonian stress regimes at the closest plate boundary. In the sedimentary basin east of the Arabian shield, the azimuths of the maximum principal compressive stresses change from ENE in southeast to ~N-S in northern portions of the plate. The shape of the plate boundary, particularly along the collisional boundaries, plays a prominent in controlling both the magnitude and orientations of the principal stresses. In addition, the geometry of the Arabian shield in western KSA and variations in the sedimentary basin thickness, cause significant local stress perturbations over 10 – 100 km length scales in different regions of the plate. The model results can provide quantitative constraints on relative magnitudes of principal stresses and horizontal stress anisotropy, both of which are critical inputs for various subsurface applications such as mechanical earth model (MEM) and subsequently wellbore stability analysis (WSA). The calibrated model results can potentially reduce uncertainties in input stress parameters for MEM and WSA and offer improvements over traditional in-situ stress estimation techniques.

Statistical Analysis of Deep In Situ Stresses Field Characteristic in Huainan Mining Area

2012 ◽  
Vol 446-449 ◽  
pp. 1615-1620 ◽  
Author(s):  
Hai Bing Cai ◽  
Hua Cheng ◽  
Chang Bo Wang
Keyword(s):  
Statistical Analysis ◽  
Measurement Data ◽  
Mining Area ◽  
Principal Stresses ◽  
Research Results ◽  
In Situ Stresses ◽  
Underground Caverns ◽  
Deep Rock ◽  
High Level

Based on deep in-situ stresses measurement data in new and old mines of Huainan mining area, in-situ stresses characteristic is researched by statistical analysis with multiple methods. Research results indicate that in-situ stresses of deep rock mass in Huainan mining area are located at high level. Scatter plots of vertical stresses, horizontal principal stresses and lateral pressure ratios variation with depth are presented, then, respective regression equation is obtained. The statistical results are helpful to finding out macroscopical characteristic of deep in-situ stresses field in Huainan mining area. The research results can also provide important reference frame for design and computation of underground caverns in Huainan mining area.

Tectonic history of the Dent Blanche

2017 ◽  
Vol 9 (2.1) ◽  
pp. 1-73 ◽  
Author(s):  
Paola Manzotti ◽  
Michel Ballèvrei
Keyword(s):  
Tectonic History ◽  
History Of
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