川南泸州地区五峰组—龙马溪组古构造应力场及裂缝特征

doi:10.12108/yxyqc.20220105

Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 43-51.doi: 10.12108/yxyqc.20220105

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Characteristics of paleotectonic stress field and fractures of WufengLongmaxi Formation in Luzhou area, southern Sichuan Basin

DONG Min^1,2,3, GUO Wei⁴, ZHANG Linyan^1,2,3, WU Zhonghai^1,2,3, MA Licheng^1,2,3, DONG Hui⁵, FENG Xingqiang^1,2,3, YANG Yuehui^1,2,3

1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
2. Key Laboratory of Paleomag-netism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing 100081, China;
3. Key Laboratory of Petroleum Geo-mechanics, Chinese Geological Survey, Beijing 100081, China;
4. PetroChina Research Institute of Exploration & Development, Beijing 100083, China;
5. Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China

Received:2021-06-25 Revised:2021-08-18 Online:2022-01-01 Published:2022-01-21

Abstract

Abstract: As a key area for deep shale gas exploration in southern Sichuan Basin,Luzhou area has experienced multi-stage tectonic movements since Mesozoic. Studies have shown that fractures of deep shale reservoirs in Wufeng-Longmaxi Formation of Lower Paleozoic are mainly controlled by regional paleotectonic stress field. In order to explore the favorable deep shale exploration areas in Luzhou area,taking the deep shale reservoir of Wufeng-Longmaxi Formation in southern Sichuan Basin as the research object,based on fold-fault system,comprehensive interpretation of seismic data,buried paleostructure depth map and testing of mechanical parameters of shale rocks,an ANSYS finite element numerical simulation method was applied to carry out numerical simulation of the palaeotectonic stress field of the target layer of Yanshan Episode Ⅲ(the main formation period of fractures). Combined with the measured results of drilling fractures,the characteristics of fractures of WufengLongmaxi formations were predicted by using the mechanical principle of fracture formation. The results show that the in-situ stress of the deep shale reservoirs in this area has the characteristics of differential distribution. The maximum principal stress direction of Yanshan Episode Ⅲ is NW,with a value of about 135°. Fractures are developed in the narrow anticlinal core and near faults,relatively developed in the low and steep syncline area,and weakly developed in the wide and gentle synclinal core. Horizontal bedding fractures and high-angle fractures are mainly developed in the study area. The fracture density distribution gradually decreases from NE to SW. In the low and steep syncline area with high stress value,fractures in deep shale reservoir are developed,which is conducive to the accumulation of free natural gas. The results can provide geological basis for deep shale gas exploration and development in Luzhou area.

Key words: paleotectonic stress field, numerical simulation, fracture prediction, Yanshan Episode, Luzhou area

CLC Number:

TE121

DONG Min, GUO Wei, ZHANG Linyan, WU Zhonghai, MA Licheng, DONG Hui, FENG Xingqiang, YANG Yuehui. Characteristics of paleotectonic stress field and fractures of WufengLongmaxi Formation in Luzhou area, southern Sichuan Basin[J].Lithologic Reservoirs, 2022, 34(1): 43-51.

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Characteristics of paleotectonic stress field and fractures of WufengLongmaxi Formation in Luzhou area, southern Sichuan Basin

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