川西南缘天宫堂构造奥陶系五峰组—志留系龙马溪组页岩气富集主控因素

doi:10.12108/yxyqc.20220213

岩性油气藏 ›› 2022, Vol. 34 ›› Issue (2): 141–151.doi: 10.12108/yxyqc.20220213

川西南缘天宫堂构造奥陶系五峰组—志留系龙马溪组页岩气富集主控因素

张梦琳¹, 李郭琴¹, 何嘉¹, 衡德²

1. 中国石油集团川庆钻探工程有限公司地质勘探开发研究院, 成都 610051;
2. 中国石油西南油气田分公司四川长宁天然气开发有限责任公司, 成都 610000

收稿日期:2021-11-13 修回日期:2022-01-25 出版日期:2022-03-01 发布日期:2022-03-14
第一作者:张梦琳(1987-),女,工程师,主要从事页岩气勘探开发综合地质研究方面的工作。地址:(610051)四川省成都市建设北路一段83号地质勘探开发研究院。Email:17284551@qq.com
通信作者: 李郭琴(1987-),女,硕士,工程师,主要从事页岩气勘探开发综合地质方面的研究工作。Email:791208869@qq.com。
基金资助:
国家自然科学基金“海相深层油气富集机理与关键工程技术基础研究”（编号：U19B6003）资助

Main controlling factors of Ordovician Wufeng-Silurian Longmaxi shale gas enrichment in Tiangongtang structure, southwestern margin of Sichuan Basin

ZHANG Menglin¹, LI Guoqin¹, HE Jia¹, HENG De²

1. Research Institute of Geological Exploration and Development, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 610051, China;
2. Sichuan Changning Natural Gas Development Co., Ltd., PetroChina Southwest Oil & Gas Field Company, Chengdu 610000, China

Received:2021-11-13 Revised:2022-01-25 Online:2022-03-01 Published:2022-03-14

摘要/Abstract

摘要： 综合利用地震、钻井、测井及岩心分析化验资料，分析了四川盆地西南缘天宫堂构造奥陶系五峰组—志留系龙马溪组的构造、沉积、储层及可改造性等基本地质特征，探讨了页岩气富集主控因素及成藏模式。研究结果表明：①天宫堂构造优质页岩集中分布在五峰组—龙马溪组龙一₁亚段，Ⅰ类储层主要发育于龙一₁¹—龙一₁³小层，厚度为0.8~17.0 m，具典型的高TOC含量、含气性好、高脆性矿物的特征。②天宫堂构造经历了晚白垩世前快速沉降、深埋藏和大量排烃阶段，形成早期富集型超压页岩气藏；晚白垩世后经2期抬升改造，早期富集型超压页岩气藏逐步向高压—常压页岩气藏调整。③研究区保存条件受地层倾角与宫1号断层的影响，造成不同构造部位页岩气差异富集。④研究区为“早期深埋藏促富集，后期隆升调富集、保存条件控富集”的背斜构造型成藏模式，构造南西翼是下步页岩气勘探开发的潜在有利区。

关键词: 富集主控因素, 页岩气, 五峰组—龙马溪组, 奥陶系, 志留系, 天宫堂构造, 川西南

Abstract: The data of seismic, drilling, logging and core analysis and test were comprehensively used to study the structure, deposition and basic reservoir geological characteristics of Ordovician Wufeng-Silurian Longmaxi Formation in Tiangongtang structure in southwestern margin of Sichuan Basin, and the main controlling factors of shale gas enrichment and accumulation model were discussed. The results show that:(1) The high-quality shale in Tiangongtang structure is mainly developed in O₃w-S₁l_1-1. Type Ⅰ reservoir is mainly developed in S₁l_1-1-1-S₁l_1-1-3 layers, with a thickness of 0.8-17.0 m, and characterized by high TOC content, good gas-bearing property and highly brittle minerals.(2) Tiangongtang structure has experienced rapid subsidence, deep burial and a large amount of hydrocarbon expulsion before the Late Cretaceous, forming an early enriched overpressure shale gas reservoir. After the Late Cretaceous, it was uplifted and reformed in two phases, and the early enriched overpressure shale gas reservoir gradually transformed to high pressure-normal pressure shale gas reservoir.(3) The preservation conditions of Tiangongtang structure are affected by stratigraphic dip angle and Gong-1 fault, resulting in differential enrichment of shale gas in different structural zones.(4) Tiangongtang structure is an anticline structure-type accumulation model of "early deep burial promotes enrichment, later uplift adjusts enrichment, and preservation conditions control enrichment". The southwest tip of the structure is a potential favorable area for next shale gas exploration and development.

Key words: main controlling factors of enrichment, shale gas, Wufeng-Longmaxi Formation, Ordovician, Silurian, Tiangongtang structure, southwestern Sichuan Basin

中图分类号:

TE122.1

张梦琳, 李郭琴, 何嘉, 衡德. 川西南缘天宫堂构造奥陶系五峰组—志留系龙马溪组页岩气富集主控因素[J]. 岩性油气藏, 2022, 34(2): 141–151.

ZHANG Menglin, LI Guoqin, HE Jia, HENG De. Main controlling factors of Ordovician Wufeng-Silurian Longmaxi shale gas enrichment in Tiangongtang structure, southwestern margin of Sichuan Basin[J]. Lithologic Reservoirs, 2022, 34(2): 141–151.

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川西南缘天宫堂构造奥陶系五峰组—志留系龙马溪组页岩气富集主控因素

Main controlling factors of Ordovician Wufeng-Silurian Longmaxi shale gas enrichment in Tiangongtang structure, southwestern margin of Sichuan Basin

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