川东南涪陵地区基底断裂特征与油气成藏

潘磊; 徐祖新; 李让彬; 邹玉涛

doi:10.3969/j.issn.1006-6535.2020.04.003

特种油气藏 >

2020 , Vol. 27 >Issue 4: 19 - 25

DOI: https://doi.org/10.3969/j.issn.1006-6535.2020.04.003

地质勘探

川东南涪陵地区基底断裂特征与油气成藏

潘磊 ,
徐祖新 ,
李让彬 ,
邹玉涛

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中国石化勘探分公司,四川成都 610041

潘磊(1984—),男,高级工程师,2006年毕业于中国地质大学(武汉)资源勘查工程专业,现主要从事石油地质综合研究工作。

收稿日期: 2019-10-23

修回日期: 2020-05-20

网络出版日期: 2022-02-18

基金资助

国家科技重大专项“四川盆地上组合大中型气田富集规律与勘探目标评价”(2017ZX05005-003-004)

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Basement Fault Characterization and Hydrocarbon Accumulation in Fuling of Southeastern Sichuan

Pan Lei ,
Xu Zuxin ,
Li Rangbin ,
Zou Yutao

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Sinopec Exploration Company, Chengdu, Sichuan 610041, China

Received date: 2019-10-23

Revised date: 2020-05-20

Online published: 2022-02-18

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摘要

为了明确川东南涪陵地区茅口组热液白云岩气藏富集规律,基于钻井、岩心和涪陵地区连片三维地震资料,分析了研究区基底断裂特征与形成演化及其对茅口组油气成藏的意义,建立了油气成藏模式。研究结果表明:研究区基底断裂剖面上发育“Y”字形与反“Y”字形、“花状”、直立状3种构造样式;平面上识别出15、15-1、16号3条基底断裂,均以北西—南东向展布为主;基底断裂纵向上具有分层特征,同时沿断裂走向又体现出分段差异性;15、15-1号基底断裂中、上构造层活动性强于16号基底断裂,15号基底断裂西段活动性强于中段和东段。基底断裂控制了茅口组油气藏的形成与分布;白云岩储层沿基底断裂两侧呈条带状展布,距基底断裂越近,下伏志留系烃源岩对茅口组成藏贡献越大,含气性越好,测试产量越高。综合研究区基底断裂、烃源岩和储层发育特征等,建立了“下生上储、双源供烃”油气成藏模式。研究成果对深化涪陵地区茅口组热液白云岩研究具有重要指导意义,同时可为其他基底断裂发育区油气成藏研究提供借鉴。

关键词： 基底断裂; 断裂特征; 油气成藏; 茅口组; 川东南地区

本文引用格式

潘磊 , 徐祖新 , 李让彬 , 邹玉涛 . 川东南涪陵地区基底断裂特征与油气成藏[J]. 特种油气藏, 2020 , 27(4) : 19 -25 . DOI: 10.3969/j.issn.1006-6535.2020.04.003

Abstract

In order to clarify the hydrothermal dolomite gas reservoir enrichment pattern of Maokou Formation, the basement fault properties, formation and evolution and their significance for the hydrocarbon accumulation in the Maokou Formation and establish a hydrocarbon accumulation mode. Research indicates that there are three tectonic styles in the basement fault cross section, including "Y" and reverse "Y" style, "flower style" and upright style. Three basement faults were identified laterally, including No.15, No.15-1 and No.16 basement faults, which all show a northwest to southeast distribution. The basement fault indicates stratified properties in the longitudinal direction and segmentation along the fault strike. The middle and upper tectonic layer activity of the basement fault No.15 and No.15-1 is higher than that of the basement fault No.16, and the west section activity is higher than that of the east section in the basement fault No.15. The basement fault controls the formation and distribution of Maokou Formation hydrocarbon reservoirs. The dolomite reservoirs show a zonal distribution along the two sides of basement fault. The underlying Silurian sourcerock contribution increases with the decrease of distance to the basement fault. The well test production increases with the increase of gas content. An "on-source accumulation, dual-source hydrocarbon supply" hydrocarbon accumulation mode was established by comprehensively considering the basement fault, sourcerock and reservoir development pattern. This research could provide certain guidance for further understanding the Maokou Formation hydrothermal dolomite in Fuling, and it can also offer certain reference for the hydrocarbon accumulation characterization in other basement fault development areas.

Key words： basement fault; fault feature; hydrocarbon accumulation; Maokou Formation; southeastern Sichuan

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