Complex in situ stress states in a deep shale gas reservoir in the southern Sichuan Basin, China: From field stress measurements to in situ stress modeling

Rui, Yong; Wu, Jianfa; Huang, Hao; Xu, Ersi; Xu, Bin

doi:10.1016/j.marpetgeo.2022.105702

Cited by 22 publications

(7 citation statements)

References 28 publications

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“…The brighter the image, the higher the resistivity of the formations is. The images can be divided into static images and dynamic images. ,, …”

Section: Methodsmentioning

confidence: 99%

“…When the stress exceeds the shear strength of the rock, the borehole wall produces a stress collapse phenomenon (Figure a,b). Therefore, the direction of wellbore collapse is the direction of σ h in the formation. − The drilling-induced fractures are in a group of relatively regular fractures with relatively large opening degrees and longitudinal extensions. They show two groups of 180° or close to 180° symmetrical distribution of feathery-like fractures.…”

Section: Methodsmentioning

confidence: 99%

“…The images can be divided into static images and dynamic images. 26,31,32 By analyzing the stresses in the well wall are analyzed, there is a maximum shear stress around the well in the direction of σ h . When the stress exceeds the shear strength of the rock, the borehole wall produces a stress collapse phenomenon (Figure 2a,b).…”

Section: 2mentioning

confidence: 99%

“…The trend of the drilling-induced fractures is the direction of the σ H (Figure 2c,d). 32,33 2.2.2. Dipole Array Acoustic Logging.…”

Section: 2mentioning

confidence: 99%

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Detailed in Situ Stress Characterization Combining Well Logging and Improved Magnitude Calculation Model of Nos. 8+9 Coal Seam in Northeastern Ordos Basin

Wang,

Li,

et al. 2024

Energy Fuels

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The characteristics of in situ stress directly influence reservoir modification and gas production performance, and accurate evaluation of stress distribution can help improve coalbed methane production and development efficiency. Taking the deep carboniferous Nos. 8+9 coal seam in the northeastern Ordos Basin as an example, different in situ stress calculation models were evaluated with comparison to injection/falloff tests based on logging data and coal mechanical parameters. Then, the hydraulic fracture extension mechanism under different in situ stress conditions was simulated. The results show that the comprehensive use of microresistivity imaging logging and dipole array acoustic logging reveals that the main maximum horizontal principal stress direction of the Nos. 8+9 coal seam is E–W, with some area affected by faults showing NE–SW and SEE–NWW. Comparing the commonly used acoustic logging model, Huang’s model, the combined spring model, and Ge’s model, it was found that the combined spring model is more applicable. This model was optimized by adding a gas saturation parameter, decreasing the relative error of stress magnitude from 7.80 to 3.62% compared to the injection/falloff measurement results. The stress field shows vertical stress > maximum horizontal principal stress > minimum horizontal principal stress. The simulation indicates that the higher the horizontal stress difference, the smaller the fracture initiation pressure and width. The larger the injection angle, the higher the fracture initiation pressure and the smaller fracture width. The above results reveal the in situ stress distribution characteristics of the Nos. 8+9 coal seam in the northeastern Ordos Basin, providing data support for the subsequent deployment of wells and reservoir fracturing as well as guidance for deep coal seams in other basins.

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“…The brighter the image, the higher the resistivity of the formations is. The images can be divided into static images and dynamic images. ,, …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

“…The trend of the drilling-induced fractures is the direction of the σ H (Figure 2c,d). 32,33 2.2.2. Dipole Array Acoustic Logging.…”

Section: 2mentioning

confidence: 99%

See 2 more Smart Citations

Detailed in Situ Stress Characterization Combining Well Logging and Improved Magnitude Calculation Model of Nos. 8+9 Coal Seam in Northeastern Ordos Basin

Wang,

Li,

et al. 2024

Energy Fuels

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show abstract

“…This episode of crustal growth significantly changed the tectonic architecture of the Sichuan Basin, causing it to transition from a passive continental margin into a foreland basin; this is evident upon examination of the sedimentary rocks which form a singular topographic depression (i.e., basin) surrounded by three uplifted regions [ 24 , 25 ]. Before the Yanshanian deformation event, tectonic activity in the Sichuan Basin was dominated by subsidence and uplift; however, after this event, tectonic activity was dominated by intensive lateral compression, which formed several fold belts [ 9 , 20 , 26 , 27 ].…”

Section: Geological Backgroundmentioning

confidence: 99%

Carbon Isotope Fractionation Characteristics of Normally Pressured Shale Gas from the Southeastern Margin of the Sichuan Basin; Insights into Shale Gas Storage Mechanisms

Yang

Xiao

et al. 2022

Nanomaterials

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Since the development of shale gas in the Wufeng–Longmaxi Formation in the Sichuan Basin, China’s shale gas production and reserves have increased rapidly. The southeastern margin of the Sichuan Basin is located in a normally pressured transition zone, where single well gas production varies greatly under complex geological structures. In order to reveal the shale gas enrichment mechanism and favorable shale gas regions, shale gas samples from production wells were collected from different structures, with the formation pressure coefficient ranging between 0.98 and 1.35. The gas components and carbon isotope characteristics of normally pressured shale gas were investigated. The carbon isotope characteristics of the Wufeng–Longmaxi shale gas from the basin scale was mainly controlled using thermal maturity; as the thermal maturity increased, heavier carbon isotopes were found, in addition to drier shale gas. For normally pressured shale gas, the composition of δ13C1 and δ13C2 becomes heavier, and the dryness coefficient decreases with the decreasing pressure coefficient; this is not consistent with the results from thermal evolution. By comparing possible influencing factors, it is evident that the change in geological structure destroys the original shale gas reservoir, which leads to the escape of some gases, and it may be the main factor that contributes to the gas geochemical characteristics of the normally pressured shale gas. Compared with the geological parameters of the shale samples, such as mineral composition, organic abundance, organic pore distribution, and gas content, the carbon isotope characteristics of normally pressured shale gas show a higher efficiency, thus indicating favorable sweet spot evaluations for shale gas in the studied areas.

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In Situ Stress Evolution and Fault-Slip Tendency Assessment of an Underground Gas Storage Reservoir in the Turpan Basin (China): In Situ Stress Measurements and Coupled Simulations

Fan¹,

Liu²,

Liu³

et al. 2023

Rock Mech Rock Eng

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Complex in situ stress states in a deep shale gas reservoir in the southern Sichuan Basin, China: From field stress measurements to in situ stress modeling

Cited by 22 publications

References 28 publications

Detailed in Situ Stress Characterization Combining Well Logging and Improved Magnitude Calculation Model of Nos. 8+9 Coal Seam in Northeastern Ordos Basin

Detailed in Situ Stress Characterization Combining Well Logging and Improved Magnitude Calculation Model of Nos. 8+9 Coal Seam in Northeastern Ordos Basin

Carbon Isotope Fractionation Characteristics of Normally Pressured Shale Gas from the Southeastern Margin of the Sichuan Basin; Insights into Shale Gas Storage Mechanisms

In Situ Stress Evolution and Fault-Slip Tendency Assessment of an Underground Gas Storage Reservoir in the Turpan Basin (China): In Situ Stress Measurements and Coupled Simulations

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