Optimization inversion analysis of a geo-stress field in a deep mine area: a case study

Fu, Qiang; Liu, Qinjie; Yang, Ke

doi:10.1007/s12517-021-06880-3

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…Thus, there are two layers of bed separation horizon. [41][42][43]. The physical and mechanical parameters were measured in the laboratory.…”

Section: Identify Of Bed Separation Zone Horizonmentioning

confidence: 99%

Research on Formation Mechanism and Evolution Pattern of Bed Separation Zone during Repeated Mining in Multiple Coal Seams

Yang

et al. 2022

Geofluids

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Mastering the formation mechanism and dynamic evolution pattern of bed separation zone during repeated mining is the key to the success or failure of separation grouting injection technology. Taking a mine in Ningdong as the engineering background, using the research methods of theoretical analysis, numerical simulated, and field measurement, four overburden structure models of single or multiple key strata with repeated mining and single or multiple key strata without repeated mining were constructed. The evolution pattern of bed separation zone was studied from four aspects: bed separation zone development mechanism, formation position, development form, and change of clearance. The results showed that when a single key stratum of repeated mining exists between coal seams, it is difficult to form a large separation area because there is no key stratum during the upper coal mining, and a separation area will be formed below the key stratum when mining the lower coal. When the key stratum exists above all coal seams, a large separation zone will be formed under the key stratum when the upper coal is mined. When mining the lower coal, when the coal seam spacing is less than 4 times of the mining height of the lower coal, the crack will penetrate the upper coal floor. If the key stratum is not completely broken, secondary separation may occur. When multiple key strata are all located above all coal seams, there will be bed separation zone under the high-level key stratum. When multiple key strata and coal seams are distributed at intervals, the separation below the high-level key stratum during upper coal mining and the separation below the low-level key stratum during lower coal mining are formed. Because the high-level key stratum bends and sinks after being affected by the mining of coal 1, the clearance of bed separation during mining coal 2 is slightly less than that during mining coal 1, which is contrary to the pattern that the greater the bed separation clearance increases with the increase of mining height.

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“…Thus, there are two layers of bed separation horizon. [41][42][43]. The physical and mechanical parameters were measured in the laboratory.…”

Section: Identify Of Bed Separation Zone Horizonmentioning

confidence: 99%

Research on Formation Mechanism and Evolution Pattern of Bed Separation Zone during Repeated Mining in Multiple Coal Seams

Yang

et al. 2022

Geofluids

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“…After nearly a century of development, the reservoir stress state can be determined by various means. At present, the research techniques for determining in-situ stress of oil and gas reservoirs and mines are mainly divided into five categories (Ljunggren et al, 2003): 1) well trajectory analysis methods (Zhao et al, 2015), 2) core test methods (Nian et al, 2016), 3) calculation methods based on logging data (Han et al, 2018), 4) methods of actual measurement of underground in-situ stresses (Fu et al, 2021) and 5) simulation methods, including physical and numerical ones (Bai et al, 2018). In the study (Hashimoto and Matsu'Ura, 2006;Lü et al, 2017), the stress field simulation was performed using a simple three-dimensional geological model, whereas the geological unit was regarded as homogeneous and had constant mechanical parameters.…”

Section: Introductionmentioning

confidence: 99%

Geomechanical Modeling and Inversion Analysis of the in-situ Stress Field in Deep Marine Shale Formations: A Case Study of the Longmaxi Formation, Dingshan Area, China

Liu

Yang

et al. 2022

Front. Earth Sci.

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Based on the comprehensive analysis of wellbore characteristics in a deep shale gas field, the in-situ stress state of the shale reservoir was assessed in this study for the Longmaxi formation in the Dingshan area, Southwestern China. The data obtained from hydraulic fracturing, drilling-induced fractures, and in-situ core testing were used to determine the magnitude and direction of the maximum principal horizontal stress in five wells. Besides, hydraulic fracturing and cross-multipole array acoustic logging (XMAC) were employed to determine the vertical variation of the in-situ stress. Based on the logging interpretation and mechanical test results, the spatial distribution of rock mechanical parameters in the Dingshan area was assessed by the amplitude variation versus offset (AVO) seismic inversion. A 3D heterogeneous mechanical inversion model was realized via the ANSYS and CATIA3D finite element software packages, providing the area in-situ stress field simulation. The depth, fault strike, and position change effects on the main stress, horizontal stress difference, and horizontal stress difference coefficient were numerically simulated. The results show that the maximum principal stress azimuth was mainly concentrated in the NE20°-NE80° sector. Moreover, the development zone of natural fractures was related to the area with the highest principal stress differences. The maximum principal stress variation in the study area was mainly in the compressive range from −135 to −45 MPa, gradually increasing from east to west and south to north. The stress type mainly depended on the depth, fault strike, and rock mechanical parameters, while the stress difference and stress difference coefficient near the fault structure were relatively small. This study’s findings are considered instrumental in improving the borehole stability, determining the casing setting point, and optimizing the well location in deep shale reservoirs with similar geological conditions.

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Research on Elaborate Construction of Complex 3D Geological Model and In-Situ Stress Inversion

Liang,

Zhu,

Sui

et al. 2023

Geotech Geol Eng

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Optimization inversion analysis of a geo-stress field in a deep mine area: a case study

Cited by 7 publications

References 23 publications

Research on Formation Mechanism and Evolution Pattern of Bed Separation Zone during Repeated Mining in Multiple Coal Seams

Research on Formation Mechanism and Evolution Pattern of Bed Separation Zone during Repeated Mining in Multiple Coal Seams

Geomechanical Modeling and Inversion Analysis of the in-situ Stress Field in Deep Marine Shale Formations: A Case Study of the Longmaxi Formation, Dingshan Area, China

Research on Elaborate Construction of Complex 3D Geological Model and In-Situ Stress Inversion

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