川东地区茅口组储层特征及主控因素
Characteristics and main controlling factors of reservoirs of Maokou Formation in eastern Sichuan Basin
钟佳倚 1王尉 1刘冉 1李阳 2杨西燕 2白晓亮 1范存辉 2彭思桥 1袁小玲1
作者信息
- 1. 中国石油西南油气田公司勘探开发研究院,四川 成都 610041
- 2. 油气藏地质及开发工程全国重点实验室,四川 成都 610500;西南石油大学地球科学与技术学院,四川 成都 610500
- 折叠
摘要
为阐明川东地区茅口组储层特征,厘清储层发育的主控因素,基于野外露头、钻井岩心以及大量测井资料,开展了川东地区茅口组储层特征研究.结果表明:1)亮晶颗粒灰岩、颗粒云岩与细—中晶白云岩为川东地区茅口组主要储集岩;2)溶洞与裂缝在石灰岩和白云岩中均有发育,孔隙主要分布于细—中晶白云岩中;3)茅口组储层主要分布于茅二a,b亚段,平面上受到颗粒滩及断裂带的控制;4)颗粒岩为茅口组储层提供了物质基础,是形成储层的最重要因素,断裂系统决定了储层的最终分布,表生期岩溶以及白云石化作用形成了大量储集空间,是改善储层质量的关键.研究认为,邻水-丰都一带沿15#基底断裂分布的茅二a,b亚段地层中的颗粒滩可以作为重点勘探开发目标.
Abstract
In order to elucidate the reservoir characteristics of Maokou Formation in eastern Sichuan Basin and to clarify the main controlling factors of reservoir development,the reservoir characteristics of Maokou Formation in eastern Sichuan Basin are studied based on field outcrops,drilling cores,and a large amount of logging data.The results indicate that:(1)Bright granular limestone,granular dolomite and fine-mesocrystalline dolomite are the main reservoir rocks of Maokou Formation in eastern Sichuan Basin.(2)Caves and fractures are developed in both limestone and dolomite,and pores are mainly distributed in fine-mesocrystalline dolomite.(3)The Maokou Formation reservoirs are mainly distributed in Mao 2 a and b submembers,which are controlled by grain shoals and fault zones on the plane.(4)Granular rock provides the material foundation for the Maokou Formation reservoir,which is the most important factor in forming the reservoirs.The fault system determines the final distribution of the reservoir,and the supergene karstification and dolomitization form a large amount of reservoir space,which is the key to improving reservoir quality.The results show that the grain shoals in the Mao 2 a and b submembers distributed along the 15# basement fault in the Linshui-Fengdu area can be a key target for exploration and development.
关键词
石灰岩储层/白云岩储层/主控因素/茅口组/川东地区Key words
limestone reservoir dolomite reservoir/main controlling factors/Maokou Formation/eastern Sichuan Basin引用本文复制引用
基金项目
四川省科技攻关计划(2022KT0401)
出版年
2024
NETL
NSTL
万方数据