深层常压页岩气富集机制研究——以涪陵页岩气田白马区块为例
Enrichment law of deep atmospheric shale gas:a case study of Baima syncline in Fuling shale gas field
徐向 1辛志源 2刘超 3姚欣欣 4刘赵毅 2唐文艳 2卢坤辉 1廖添2
作者信息
- 1. 中国石化重庆涪陵页岩气勘探开发有限公司,重庆 408000
- 2. 中国石油大学(北京)油气资源与工程全国重点实验室,北京 102249
- 3. 中国石化江汉油田分公司勘探开发研究院,湖北武汉 433124
- 4. 中国石油长庆油田公司第五采气厂,陕西西安 710018
- 折叠
摘要
目前,我国南方海相页岩气勘探开发主要聚焦在中深层超压背斜,而针对深层常压页岩气富集机制的研究较为薄弱.以白马向斜南斜坡Y162 井为例,在系统评价五峰组-龙一1 亚段页岩气赋存状态及储层孔隙结构的基础上,与焦石坝背斜JY11-4 井中深层异常高压页岩气成藏特征对比,结果表明:1)白马向斜五峰组-龙一1 亚段页岩气含量略高于焦石坝背斜,是典型以吸附气为主的深层常压气藏;2)白马向斜页岩孔隙度明显低于焦石坝背斜,且孔隙度与TOC呈正相关,单位TOC比表面积更高;3)地层抬升幅度小,远离大断裂带,受构造活动影响小,断裂欠发育,构造保存条件较好,来自白马向斜核部页岩气的顺层扩散对斜坡区页岩气藏进行气源补充,是斜坡区页岩气维持常压、最终形成以吸附气为主的深层常压向斜型页岩气富集的关键因素.
Abstract
At present,the exploration and development of marine shale gas in south China is mainly focused on the middle and deep over-pressure anticline,while the research on the enrichment mechanism of deep deep atmospheric pressure shale gas is relatively weak.Taking well Y162 in the south slope of Baima syn-cline as an example,based on the systematic evaluation of the occurrence state and pore structure of shale gas in the Wufeng-Longyi sub-member,the comparison with the accumulation characteristics of abnor-mally high pressure of shale gas in Jiaoshiba anticline JY11-4 well was carried out.The results indicate that(1)The shale gas content of Baima syncline Wufeng-Longyi sub-member is slightly higher than that of in Jiaoshiba anticline.(2)The porosity of Boma syncline shale is obviously lower,the porosity is posi-tively correlated with TOC,and the specific surface area per unit TOC of Boma syncline is higher.(3)The strata uplift is small,far away from the large fault zone,less affected by tectonic activities,underdeveloped fractures,and good structural preservation conditions.The bedding diffusion of shale gas from the core of the Boma syncline plays a good gas source supplement to the shale gas in the slope area,which is the key factor to maintain normal pressure and finally form the deep atmospheric syncline shale gas enrichment domi-nated by adsorption gas.
关键词
白马向斜/页岩气/深层常压/保存条件/页岩气富集规律Key words
Baima syncline/shale gas/deep atmospheric pressure/preservation conditions/shale gas en-richment law引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据