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

岩性油气藏 ›› 2022, Vol. 34 ›› Issue (1): 43–51.doi: 10.12108/yxyqc.20220105

川南泸州地区五峰组—龙马溪组古构造应力场及裂缝特征

董敏^1,2,3, 郭伟⁴, 张林炎^1,2,3, 吴中海^1,2,3, 马立成^1,2,3, 董会⁵, 冯兴强^1,2,3, 杨跃辉^1,2,3

1. 中国地质科学院地质力学研究所, 北京 100081;
2. 自然资源部古地磁与古构造重建重点实验室, 北京 100081;
3. 中国地质调查局油气地质力学重点实验室, 北京 100081;
4. 中国石油勘探开发研究院, 北京 100083;
5. 中国地质调查局西安地质调查中心, 西安 710054

收稿日期:2021-06-25 修回日期:2021-08-18 出版日期:2022-01-01 发布日期:2022-01-21
第一作者:董敏(1983-),女,博士,副研究员,主要从事构造地质和油气地质方面的研究。地址:(100081)北京市海淀区民族大学南路11号。Email:dongminyf@sina.com
通信作者: 郭伟（1973—），男，博士，高级工程师，主要从事页岩气与开发地质等工作。Email：pkuguowei69@petrochina.com.cn。
基金资助:
中国石油天然气集团公司科技项目“川南深层页岩综合地质评价和效益开发技术研究”（编号：kt2021-11-01）和中国地质调查局地质调查项目“重点地区构造体系及油气页岩气控藏条件调查”（编号：DD20190085）联合资助

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

摘要/Abstract

摘要： 川南泸州地区为深层页岩气勘探的重点区，中生代以来经历了多期构造运动，下古生界五峰组—龙马溪组深层页岩储层的裂缝主要受控于区域古构造应力场。为了探究泸州地区有利的深层页岩勘探区，以其五峰组—龙马溪组深层页岩地层为研究对象，以褶皱断裂系统、地震资料综合解释、埋深古构造图和页岩岩石力学参数测试为基础，开展了目的层燕山期Ⅲ幕（裂缝主要形成时期）的古构造应力场数值模拟，采用ANSYS有限元数值模拟方法，结合钻井裂缝实测结果，利用裂缝形成的力学原理，预测了其裂缝发育特征。结果表明：该区深层页岩储层的地应力呈差异分布，燕山期Ⅲ幕最大主应力方向为NW向，约为135°；窄背斜核部和断裂附近裂缝发育，低陡构造向斜区裂缝较发育，宽缓向斜核部裂缝弱发育；主要发育水平层理缝和高角度裂缝，裂缝密度分布由NE向SW逐渐降低，在高应力值的低陡构造向斜区，深层页岩储层裂缝发育，有利于游离态天然气聚集。该结论为泸州地区深层页岩气的勘探开发提供了地质依据。

关键词: 古构造应力场, 数值模拟, 裂缝预测, 燕山期, 泸州地区

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

中图分类号:

TE121

董敏, 郭伟, 张林炎, 吴中海, 马立成, 董会, 冯兴强, 杨跃辉. 川南泸州地区五峰组—龙马溪组古构造应力场及裂缝特征[J]. 岩性油气藏, 2022, 34(1): 43–51.

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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川南泸州地区五峰组—龙马溪组古构造应力场及裂缝特征

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

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