川南—川东地区龙马溪组优质页岩分布及主控因素
The Distribution and Main Controlling Factors of High-quality Shale in Longmaxi Formation in Southern Sichuan-Eastern Sichuan Region
陈渝川 1林伟 2李明涛 2韩登林 1郭伟3
作者信息
- 1. 长江大学,湖北 武汉 430100
- 2. 临沂大学,山东 临沂 276000
- 3. 中国石油勘探开发研究院,北京 100083
- 折叠
摘要
四川盆地海相页岩气资源丰富,自古生代至新生代,盆地经历了多期构造运动,形成了复杂的构造样式和多变的沉积环境,导致页岩气资源分布不均.为厘清优质页岩的分布规律,以川南—川东地区龙马溪组页岩为例,开展了全岩X衍射、地球化学测试、盆地模拟、钻录井资料分析,从沉积、成藏、构造等角度对优质页岩的分布规律及主控因素进行了讨论并划分页岩气勘探开发有利区.研究表明:川南—川东地区优质页岩主要分布在半深水—深水陆棚相;Ro值为2.5％～3.5％时有利于发育优质页岩;褶皱构造对页岩气的富集和分布起到较为明显的控制作用.研究结果可为川南—川东地区的页岩探勘开发提供理论依据.
Abstract
Sichuan Basin is rich in marine shale gas resources.From Paleozoic to Cenozoic,the basin has experi-enced multiple tectonic movements,forming complex structural styles and variable sedimentary environments,featu-ring with uneven distribution of shale gas resources.In order to clarify the distribution law of high-quality shale,taking the Longmaxi Formation shale in southern Sichuan-eastern Sichuan Region as an example,comprehensive analyses including whole-rock X-ray diffraction,geochemical testing,basin simulation,and drilling and logging data analysis were conducted.The distribution law and main controlling factors of high-quality shale were discussed from the perspectives of sedimentation,reservoir formation,and structure,and favorable areas for shale gas explora-tion and development were delineated.The results show that high-quality shale in the southern Sichuan-eastern Si-chuan Region is mainly distributed in the semi-deepwater to deepwater continental shelf facies;an Ro value of 2.5％to 3.5％is conducive to the development of high-quality shale;and fold structures play a significant control-ling role in the enrichment and distribution of shale gas.The research results can provide theoretical basis for shale exploration and development in southern Sichuan-eastern Sichuan Region.
关键词
页岩/主控因素/沉积环境/储层分布/龙马溪组/川南—川东地区Key words
shale/main controlling factors/sedimentary environment/reservoir distribution/Longmaxi Formation/southern Sichuan-eastern Sichuan Region引用本文复制引用
基金项目
国家自然科学基金青年基金(42202141)
出版年
2024
国家科技期刊平台
NSTL
万方数据