辽河盆地雷61储气库安全运行相关断层稳定性评价

doi:10.11743/ogg20250521

Abstract

Abstract:

The safe operation of underground gas storage （UGS） facilities is crucial for ensuring a stable gas supply， achieving seasonal peak shaving， and securing strategic energy reserves. Fault stability is， in turn， a critical to keeping the UGS integrity. Therefore， it is essential to assess the stability of faults in a UGS facility and determine the critical pressure for fault instability. In this study， we explore the stability of faults in the Lei 61 UGS facility within the Liaohe Basin. Conventional method that assumes the frictional coefficient of faults is a fixed value， tends to overestimate the fault stability， as shown by the research results. Given that clay minerals can reduce the frictional strength， we examine the relationships of clay minerals of various types with the frictional coefficient of faults. By integrating theoretical calculations with the experimental calibration of the frictional strength， we develop a model for quantitatively characterizing the heterogeneity in the frictional strength of faults tailored to the study area. This approach enhances the scientific rigor of fault stability assessment and enables a more accurate fault stability assessment for the Lei 61 UGS facility. According to the comparison of the assessment results， the conventional assessment method predicts that all faults in the UGS facility remain highly stable under the current stress field， at a minimum activation pressure of 20.04 MPa； in contrast， the improved assessment method indicates a minimum activation pressure of 16.68 MPa， with a decrease of 3.36 MPa， despite the absence of any fault activation.

Key words: clay mineral, heterogeneity in the frictional coefficient of a fault, maximum allowable pressure of a fault, fault stability assessment method, Lei 61 underground gas storage （UGS） facility, Liaohe Basin

CLC Number:

TE822

Chao WANG, Xiaofei FU, Yejun JIN, Lingdong MENG, Xianxue CHEN, Tianguang ZHANG, Haidong SHI. Fault stability assessment for the safe operation of the Lei 61 underground gas storage facility in the Liaohe Basin[J]. Oil & Gas Geology, 2025, 46(5): 1731-1744.

Figures/Tables 18

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断层编号	断层走向	断层倾向	断层倾角/（°）	断层性质	断距/m	断层延伸长度/km
F1	北东向	南东向	65.1	正断层	700～1 000	5.4
F2	北东向	南东向	55.5	正断层	35～120	2.5
F3	北东向	北西向	59.3	正断层	25～75	3.1
F4	东西向	北向	58.6	正断层	15～70	1.1
F5	东西向	南向	38.4	正断层	15～40	0.5
F6	东西向	南向	35.8	正断层	15～35	0.5

实验序号	样品质量/g	黏土矿物组分含量/g				石英含量/g	泥质含量/%	有效正应力/MPa	旋转角度/（°）
实验序号	样品质量/g	蒙脱石	伊利石	高岭石	绿泥石	石英含量/g	泥质含量/%	有效正应力/MPa	旋转角度/（°）
1	100.0	21.4	11.8	3.5	3.3	60.0	40.0	10.0	90
2	100.0	32.2	17.6	5.2	5.0	40.0	60.0	10.0	90
3	100.0	42.9	23.5	7.0	6.6	20.0	80.0	10.0	90

Fault stability assessment for the safe operation of the Lei 61 underground gas storage facility in the Liaohe Basin

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Figures/Tables 18

References 67

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样品编号	深度/m	黏土矿物组分占比/%				伊/蒙混层比/%
样品编号	深度/m	伊/蒙混层	伊利石	高岭石	绿泥石	伊/蒙混层比/%
1	1 341.1	42	29	15	14	73
2	1 346.0	48	23	15	14	79
3	1 347.8	57	23	10	10	71
4	1 348.7	58	22	10	10	71
5	1 349.6	62	23	8	7	76
6	1 354.4	40	33	14	13	56
7	1 356.0	75	15	5	5	86
8	1 357.0	71	16	6	7	86
9	1 358.6	65	21	7	7	88
10	1 368.0	71	13	8	8	90
11	1 371.0	82	7	6	5	96
12	1 372.7	72	18	5	5	95
13	1 381.9	77	10	7	6	94
14	1 384.9	80	9	6	5	96
15	1 391.8	61	23	8	8	68

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