摘要
基于野外露头剖面实测和钻井剖面系统取心资料,结合微观观察、物性分析、矿物学分析和地球化学分析,研究四川盆地及周缘中二叠统茅口组一段储集层特征。结果表明:①茅口组一段灰岩-泥灰岩韵律储集层主要发育在泥灰岩层中,储集空间类型多样,以次生溶蚀孔隙和黏土矿物孔缝为主,为一套低孔低渗裂缝-孔隙型致密碳酸盐岩储集层;②黏土矿物主要为成岩黏土矿物海泡石、滑石以及二者的中间产物阿里石,几乎不含陆源黏土矿物,且不同区域所含黏土种类差异显著;③优质灰岩-泥灰岩韵律致密碳酸盐岩储集层的形成主要与早期海水埋藏阶段差异成岩作用和早成岩期暴露岩溶作用有关。研究认为,川西南内缓坡更容易形成甜点高产区,川东外缓坡更容易形成体量较大连片分布的低产区。
Based on a large number of field outcrops and cores taken systematically from boreholes,by microscopic observation,physical property analysis,mineralogy analysis,geochemical analysis etc.,reservoir characteristics of the first member of Middle Permian Maokou Formation in Sichuan Basin("Mao 1 Member"for short)are analyzed.(1)Rhythmic limestone-marl reservoirs of this member mostly exist in marl layers are a set of tight carbonate fracture-pore type reservoir with low porosity and low permeability,with multiple types of storage space,mainly secondary dissolution pores and fissures of clay minerals.(2)The clay minerals are mainly diagenetic clay minerals,such as sepiolite,talc and their intermediate products,aliettite,with hardly terrigenous clay minerals,and the reservoir in different regions have significant differences in the types of clay minerals.(3)The formation of high quality tight carbonate reservoir with limestone-marl interbeds is related to the differential diagenesis in the early seawater burial stage and the exposure karstification in the early diagenetic stage.It is inferred through the study that the inner ramp of southwestern Sichuan Basin is more likely to have sweet spots with high production,while the outer ramp in eastern Sichuan Basin is more likely to have large scale contiguous reservoir with low production.
作者
苏成鹏
李蓉
石国山
贾霍甫
宋晓波
SU Chengpeng;LI Rong;SHI Guoshan;JIA Huofu;SONG Xiaobo(Research Institute of Exploration and Development,Southwest Branch Company,Sinopec,Chengdu 610041,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2021年第6期1150-1161,共12页
Petroleum Exploration and Development
基金
中国石化科技攻关项目群下属课题西南探区天然气富集规律与目标评价(P20059-3)
中国石化西南油气分公司科技攻关项目“四川盆地中二叠统构造演化与成藏研究”(KJ-633-2103)。
关键词
四川盆地
茅口组
灰岩-泥灰岩韵律
致密碳酸盐岩储集层
次生溶蚀孔隙
自生黏土矿物
勘探方向
Sichuan Basin
Maokou Formation
limestone-marl alternations
tight carbonate reservoir
secondary dissolution pore
authigenic clay minerals
exploration direction
