渝东南南川地区东胜构造带常压页岩气勘探开发实践

Exploration and development practice of normal pressure shale gas in Dongsheng structural belt, Nanchuan area, southeast Chongqing

何希鹏 张培先 任建华 王伟 卢比

HE Xipeng ZHANG Peixian REN Jianhua WANG Wei LU Bi

中国石化 华东油气分公司, 南京 210019; 2. 中国石化 华东油气分公司 勘探开发研究院, 南京 210019

1. SINOPEC East China Oil & Gas Company, Nanjing, Jiangsu 210019, China; 2. Research Institute of Exploration and Development, SINOPEC East China Oil & Gas Company, Nanjing, Jiangsu 210019, China

渝东南南川地区东胜构造带位于四川盆地东南缘的盆缘过渡带，经历多期构造改造，具有构造复杂、保存条件复杂、地应力场复杂的典型地质特征，导致常压页岩气单井产量差异较大。为提高东胜复杂构造带常压页岩气单井产量、实现效益开发，通过开展地震资料目标处理、构造特征分析、成藏富集规律研究及生产动态分析等，以及加强基础研究和勘探开发实践，明确了东胜复杂构造带实现常压页岩气效益开发的四项关键技术对策：①提高浅层速度模型精度，提升构造解释准确度；②优化井网部署，提高井控储量；③地质工程一体化，钻定导协同导向提高甜点钻遇率；④建立分区差异化压裂方案，提高裂缝复杂度。东胜常压页岩气效益开发关键技术对策为复杂构造带常压页岩气的效益开发提供了技术支撑，同时也可为盆缘其他类似地区的勘探开发提供借鉴。

The Dongsheng structural belt in Nanchuan area, southeast Chongqing, is located in the transitional zone of the southeastern margin of Sichuan Basin. It has experienced multi-period tectonic reformation and has typical geological characteristics of complex structure, complex preservation conditions and complex in-situ stress field, which leads to a significant difference in single well production. In order to increase the single well production of normal pressure shale gas wells in Dongsheng complex structural belt and realize profitable development, through target processing of seismic data, analysis of structural characteristics, study of accumulation regularity and analysis of production dynamics, as well as the strengthening of basic research and exploration and development practice, four key technical countermeasures for realizing profitable development of normal pressure shale gas in Dongsheng complex structural belt are defined: (1) improve the accuracy of shallow velocity model and structure interpretation; (2) optimize well pattern deployment, increase well-controlled reserves; (3) integrate geology and engineering, and coordinate drilling, orientation and steering to improve the drilling rate of sweet spots; (4) establish a zonal differentiated fracturing scheme to improve fracture complexity. These four countermea-sures provide technical support for the profitable development of normal pressure shale gas in complex structural zones, and provide reference for the exploration and development of other similar areas along the basin margin.

国家科技重大专项(2016ZX05061)和中国石化科技部项目(P21087-6)联合资助。

https://doi.org/10.11781/sysydz2023061057