基于拓扑结构分析的断层连通性评价——以川南泸州中区深层页岩气储层多级断层为例

doi:10.13809/j.cnki.cn32-1825/te.2024.03.014

油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (3): 446-457.doi: 10.13809/j.cnki.cn32-1825/te.2024.03.014

基于拓扑结构分析的断层连通性评价——以川南泸州中区深层页岩气储层多级断层为例

梁孝柏^1,²(),鞠玮^1,²()

1.中国矿业大学煤层气资源与成藏过程教育部重点实验室，江苏徐州 221116
2.中国矿业大学资源与地球科学学院，江苏徐州 221116

收稿日期:2023-05-22 出版日期:2024-06-26 发布日期:2024-07-10
通讯作者: 鞠玮（1988—），男，博士，副教授，主要从事非常规油气储层地应力学教学与教研。地址：江苏省徐州市大学路1号中国矿业大学南湖校区资源与地球科学学院，邮政编码：221116。E-mail: wju@cumt.edu.cn
作者简介:梁孝柏（2000—），男，在读硕士研究生，主要从事油气储层地应力场与裂缝预测研究。地址：江苏省徐州市大学路1号中国矿业大学南湖校区资源与地球科学学院，邮政编码：221116。E-mail: TS22010053A31@cumt.edu.cn
基金资助:
国家重点研发计划项目“页岩储层甲烷原位燃爆压裂理论与技术”(2020YFA0711800)

Fault connectivity evaluation based on topological structure analysis: A case study of multi-stage faults of deep shale gas reservoirs in central Luzhou Block, southern Sichuan

LIANG Xiaobai^1,²(),JU Wei^1,²()

1. Key Laboratory of Coalbed Methane Resources & Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
2. School of Resources and Earth Sciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

Received:2023-05-22 Online:2024-06-26 Published:2024-07-10

摘要/Abstract

摘要：

川南深层页岩气是中国天然气增储上产的重要领域。断层连通性是影响深层页岩气储层渗透性能、单井产能的重要因素，前期多针对断层形态、组合样式开展研究，鲜有断层连通性的系统量化评价。研究以川南泸州中区五峰组页岩气储层多级断层为研究对象，利用拓扑结构分析方法研究断层网络拓扑结构，并对其连通性进行定量评价，结果显示：泸州中区五峰组断层发育，断层网络分支的平均连接点数为1.12，可形成高渗通道，有利于页岩气的运移。研究区中部及南部断层产状分散度、断层长度分散度和断层密度均较大，连接型节点、分支数量多，有利于提高断层连通性，其连通性评价结果优于其他区域，具备一定的潜在高产井可能。

关键词: 泸州中区, 深层页岩气, 连通性评价, 拓扑结构, 断层网络

Abstract:

Deep shale gas reserves in southern Sichuan represent a significant opportunity for augmenting China's natural gas reserves and production. One critical factor influencing the permeability and productivity of individual wells in these deep shale gas reservoirs is fault connectivity. Previous research has primarily focused on fault morphology and combination styles, with little systematic quantitative assessment of fault connectivity. This study targets the Wufeng Formation reservoir in the central Luzhou section of the southern Sichuan Basin, initiating a detailed analysis of the fault network structure and connectivity using multiple faults as reference points. Findings indicate that faults in the Wufeng Formation of the central Luzhou area are well-developed, with an average of 1.12 connection points per branch network. These networks potentially form highly permeable channels favorable for shale gas transport. The central and southern parts of the study area exhibit higher fault dispersion, fault length dispersion, and fault density, which contribute to a greater number of connecting nodes and branches. This enhanced connectivity is conducive to the development of high-production wells. The connectivity assessment results from these regions are superior to other studied areas, indicating notable potential for high-yield well development in the Wufeng Formation.

Key words: central Luzhou Block, deep shale gas, connectivity evaluation, topological structure, fault network

中图分类号:

TE12

梁孝柏, 鞠玮. 基于拓扑结构分析的断层连通性评价——以川南泸州中区深层页岩气储层多级断层为例[J]. 油气藏评价与开发, 2024, 14(3): 446-457.

LIANG Xiaobai, JU Wei. Fault connectivity evaluation based on topological structure analysis: A case study of multi-stage faults of deep shale gas reservoirs in central Luzhou Block, southern Sichuan[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 446-457.

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基于拓扑结构分析的断层连通性评价——以川南泸州中区深层页岩气储层多级断层为例

Fault connectivity evaluation based on topological structure analysis: A case study of multi-stage faults of deep shale gas reservoirs in central Luzhou Block, southern Sichuan

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