In situ stress conditions at IODP Site C0002 reflecting the tectonic evolution of the sedimentary system near the seaward edge of the Kumano basin, offshore from SW Japan

2017 ◽  
Vol 122 (5) ◽  
pp. 4033-4052 ◽  
Author(s):  
Insun Song ◽  
Chandong Chang
Keyword(s):  
Tectonic Evolution ◽  
In Situ Stress ◽  
Stress Conditions ◽  
Seaward Edge ◽  
Sedimentary System ◽  
Kumano Basin ◽  
Sw Japan

scholarly journals In situ stress state from walkaround VSP anisotropy in the Kumano basin southeast of the Kii Peninsula, Japan

2011 ◽  
Vol 12 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Takeshi Tsuji ◽  
Ryota Hino ◽  
Yoshinori Sanada ◽  
Kiyohiko Yamamoto ◽  
Jin-Oh Park ◽  
...  
Keyword(s):  
Stress State ◽  
In Situ Stress ◽  
Kii Peninsula ◽  
Kumano Basin

Experiment on Mechanical Properties and Seepage Capability of Deep Tight Sandstone Under True-Triaxial Stresses Environment

2021 ◽  
Author(s):  
Jiaying Li ◽  
Chunyan Qi ◽  
Ye Gu ◽  
Yu Ye ◽  
Jie Zhao
Keyword(s):  
Mechanical Properties ◽  
In Situ Stress ◽  
Stress Sensitivity ◽  
Stress Conditions ◽  
Tight Sandstone ◽  
Gas Reservoir ◽  
True Triaxial ◽  
Strain Behavior ◽  
Triaxial Stresses

Abstract The characteristics of seepage capability and rock strain during reservoir depletion are important for reservoir recovery, which would significantly influence production strategy optimization. The Cretaceous deep natural gas reservoirs in Keshen Gasfield in Tarim Basin are mainly buried over 5000 m, featuring with ultra-low permeability, developed natural fractures and complex in-situ stress states. However, there is no comprehensive study on the variation of mechanical properties and seepage capability of this gas reservoir under in-situ stress conditions and most studies on stress-sensitivity are conducted under conventional triaxial or uniaxial stress conditions, which cannot truly represent in-situ stress environment. In this work, Cretaceous tight sandstone in Keshen Gasfield was tested under true-triaxial stresses conditions by an advanced geophysical imaging true-triaxial testing system to study the stress-sensitivity and anisotropy of rock stress-strain behavior, porosity and permeability. Four groups of sandstone samples are prepared as the size of 80mm×80mm×80mm, three of which are artificially fractured with different angle (0°,15°，30°) to simulate hydraulic fracturing. The test results corresponding to different samples are compared to further reveal the influence of the fracture angle on rock mechanical properties and seepage capability. The samples are in elastic strain during reservoir depletion, showing an apparent correlation with fracture angles. The porosity decreases linearly with stress loading, where the decrease rate of effective porosity of fracture samples is significantly higher than that of intact samples. The permeabilities decrease exponentially and show significant anisotropy in different principal stress directions, especially in σH direction. The mechanical properties and seepage capability of deep tight sandstone are successfully tested under true-triaxial stresses conditions in this work, which reveals the stress-sensitivity of anisotropic permeability, porosity and stress-strain behavior during gas production. The testing results proposed in this paper provides an innovative method to analyse rock mechanical and petrophysical properties and has profound significance on exploration and development of tight gas reservoir.

An Electrokinetic Testing Apparatus for Undisturbed/Remoulded Soils under In-Situ Stress Conditions

2000 ◽  
Vol 23 (2) ◽  
pp. 215 ◽  
Author(s):  
RC Chaney ◽  
KR Demars ◽  
JQ Shang ◽  
KL Masterson
Keyword(s):  
In Situ Stress ◽  
Stress Conditions ◽  
Testing Apparatus

scholarly journals Hydraulic Fracture Propagation under Varying In-situ Stress Conditions of Reservoirs

2017 ◽  
Vol 191 ◽  
pp. 410-418 ◽  
Author(s):  
P.L.P. Wasantha ◽  
H. Konietzky
Keyword(s):  
Hydraulic Fracture ◽  
Fracture Propagation ◽  
In Situ Stress ◽  
Stress Conditions ◽  
Hydraulic Fracture Propagation

3D characterization of coal strains induced by compression, carbon dioxide sorption, and desorption at in-situ stress conditions

2010 ◽  
Vol 82 (3-4) ◽  
pp. 262-268 ◽  
Author(s):  
J. Denis N. Pone ◽  
Phillip M. Halleck ◽  
Jonathan P. Mathews
Keyword(s):  
Carbon Dioxide ◽  
In Situ Stress ◽  
Stress Conditions ◽  
Carbon Dioxide Sorption

The application of strata reinforcement techniques for the determination of in-situ stress conditions in weak coal measures strata

1989 ◽  
Vol 9 (1) ◽  
pp. 1-9
Author(s):  
T.R.C. Aston ◽  
E. Harvey ◽  
C. Mirza
Keyword(s):  
In Situ Stress ◽  
Stress Conditions ◽  
Coal Measures

Influences of hydraulic fracturing on microfractures of high-rank coal under different in-situ stress conditions

Fuel ◽  
2021 ◽  
Vol 287 ◽  
pp. 119566
Author(s):  
Pengwei Mou ◽  
Jienan Pan ◽  
Kai Wang ◽  
Jiang Wei ◽  
Yanhui Yang ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
In Situ Stress ◽  
Stress Conditions ◽  
High Rank

scholarly journals Numerical Simulation of Empty-Hole Effect during Parallel-Hole Cutting under Different In Situ Stress Conditions

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhengyu Wu ◽  
Dayou Luo ◽  
Feng Chen ◽  
Wulin Huang
Keyword(s):  
Stress Field ◽  
Horizontal Stress ◽  
In Situ Stress ◽  
Vertical Stress ◽  
Stress Conditions ◽  
Deep Mining ◽  
In Situ Stress Field ◽  
Hole Effect ◽  
Parallel Hole

With the progress of deep mining in mine exploitation, the effect of the in situ stress field plays a more and more significant and crucial role in rock blasting. To uncover the impact of in situ stress field on empty-hole effect during parallel-hole cutting, the distribution and the trend of changes in dynamic stress around empty hole during blasting under different in situ stress conditions are simulated based on the basic model for parallel-hole cutting using 3D finite element analysis software ANSYS/LS-DYNA and implicit-explicit analysis method. Subsequently, the law of variation in the empty-hole effect under different in situ stress conditions is determined, and the effects of horizontal and vertical stress fields are analyzed in detail. The simulation results show that the overall increase in in situ stress can facilitate compressive failure and inhibit tensile failure in the rock mass around an empty hole during blasting. When empty holes are arranged horizontally, the effect of the vertical stress field is consistent with that of the in situ stress field, while the effect of the horizontal stress field is opposite to that of the in situ stress field. With the increased stress, the inhibitive effect of the vertical stress field on tensile stress around an empty hole is remarkably stronger than that of the horizontal stress field. Finally, the numerically simulated results are verified by the theoretical calculation. This study can provide new insight and a simple but accurate numerical simulation method to investigate how the in situ stress field affects the empty-hole effect, especially in deep mining.

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