基于盆地模拟的强改造向斜型页岩气动态成藏演化特征

蓝宝锋; 李斌; 钟笠; 刘红岐; 李绍鹏; 邓泰宇; 唐涛

doi:10.3969/j.issn.1006-6535.2025.05.004

特种油气藏 >

2025 , Vol. 32 >Issue 5: 28 - 39

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.05.004

地质勘探

基于盆地模拟的强改造向斜型页岩气动态成藏演化特征

蓝宝锋 ,
李斌 ,
钟笠 ,
刘红岐 ,
李绍鹏 ,
邓泰宇 ,
唐涛

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1.贵州能源产业研究院有限公司,贵州贵阳 550025;
2.西南石油大学,四川成都 610500;
3.四川省天然气重点实验室,四川成都 610500

蓝宝锋(1981—),男,正高级工程师,2004年毕业于成都理工大学地质学专业,2015年毕业于中国地质大学(北京)地质工程专业,获硕士学位,现从事非常规天然气勘探开发研究及管理工作。

收稿日期: 2024-10-15

修回日期: 2025-08-26

网络出版日期: 2025-10-30

基金资助

贵州省找矿突破战略行动重大协同创新项目“贵州省页岩气效益开发关键技术及工程试验”(黔科合战略找矿[2022]ZD005)

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Dynamic accumulation evolution of shale gas in strongly reformed syncline-type structures based on basin modeling

LAN Baofeng ,
LI Bin ,
ZHONG Li ,
LIU Hongqi ,
LI Shaopeng ,
DENG Taiyu ,
TANG Tao

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1. Guizhou Energy Industry Research Institute Co., Ltd, Guiyang, Guizhou 550025, China;
2. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
3. Natural Gas Geology Key Laboratory of Sichuan Province, Chengdu, Sichuan 610500, China

Received date: 2024-10-15

Revised date: 2025-08-26

Online published: 2025-10-30

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摘要

针对黔北地区强改造向斜型页岩气动态演化历史和富集规律认识不清的难题,以测试资料、钻井资料以及地球物理资料为基础,恢复了安场向斜五峰组—龙马溪组页岩埋藏史、生烃史以及页岩动态成藏过程。结果表明:安场向斜五峰组—龙马溪组页岩印支期前整体具有“持续生烃、整体富气、地层超压”的特征,印支期后整体具有“缓慢生烃、差异富集、抬升泄压”的特征,页岩成熟度为2.8%~3.0%;页岩含气量演化具有印支—燕山早期稳定上升,燕山—喜山期逐渐下降的趋势;压力系统发育“常压—生烃增压—超压—泄压”演化过程,现今为常压地层;含气性结构表明早期以吸附烃为主,海西期后游离烃含量逐渐升高,燕山期后吸附烃和游离烃含量整体下降,现今以游离烃为主,游吸比为1.50~1.80。向斜构造页岩气富集与地层倾角、埋深、距露头区距离呈现良好的相关性;Ⅰ、Ⅱ级断层对页岩气藏起到破坏作用,Ⅲ、Ⅳ级断层附近页岩气局部富集。安场向斜构造发育5种页岩气富集模式:核部长期聚气型、缓翼缓聚型、小断层侧向遮挡型、陡翼-通天断层型、晚期剥蚀逸散型。其中,核部长期聚气型为最有利页岩气富集模式。研究成果为黔北地区强改造区页岩气资源评价提供了典型案例。

关键词： 页岩气; 保存条件; 富集模式; 五峰组—龙马溪组

本文引用格式

蓝宝锋 , 李斌 , 钟笠 , 刘红岐 , 李绍鹏 , 邓泰宇 , 唐涛 . 基于盆地模拟的强改造向斜型页岩气动态成藏演化特征[J]. 特种油气藏, 2025 , 32(5) : 28 -39 . DOI: 10.3969/j.issn.1006-6535.2025.05.004

Abstract

In addressing the challenge of unclear understanding of the dynamic evolution history and enrichment patterns of shale gas in strongly reformed syncline-type structures in northern Guizhou, the burial history, hydrocarbon generation history, and dynamic accumulation process of the Wufeng-Longmaxi shale in the Anchang Syncline were reconstructed based on testing data, drilling data, and geophysical data. The results indicate that the Wufeng-Longmaxi shale in the Anchang Syncline generally exhibited the characteristics of "continuous hydrocarbon generation, overall gas enrichment, formation overpressure" before the Indosinian period, and experienced a process of "slow hydrocarbon generation, differential enrichment, uplift and pressure release" after the Indosinian period, with shale maturity ranging from 2.8% to 3.0%; the evolution of shale gas content shows a trend of stable increase during the Indosinian-Early Yanshanian period and gradual decrease during the Yanshanian-Himalayan period; the pressure system underwent an evolution process of "normal pressure - hydrocarbon generation pressurization - overpressure - pressure release", and is currently at normal formation pressure; the gas content structure indicates that adsorbed hydrocarbon was dominant in the early stage, free hydrocarbon gradually increased after the Hercynian period, and both adsorbed and free hydrocarbons generally decreased after the Yanshanian period. Currently, free hydrocarbon is dominant, with a free-to-adsorbed hydrocarbon ratio of 1.50-1.80. Shale gas enrichment in syncline structures shows good correlation with formation dip angle, burial depth, and distance to outcrop areas; Class I and II faults damage shale gas reservoirs, while shale gas is locally enriched near Class III and IV faults. The Anchang Syncline structure develops five shale gas enrichment patterns: core long-term gas accumulation type, gentle wing slow accumulation type, small fault lateral sealing type, steep wing-through-going fault type, and late-stage erosion dissipation type. Among them, the core long-term gas accumulation type is the most favorable shale gas enrichment pattern. The research results provide a typical case for shale gas resource evaluation in strongly reformed areas of northern Guizhou.

Key words： shale gas; preservation conditions; enrichment patterns; Wufeng-Longmaxi Formation

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