Reservoir characteristics of the first member of Middle Permian Maokou Formation in Sichuan Basin and its periphery and inspirations to petroleum exploration,SW China  

作　　者：SU Chengpeng LI Rong SHI Guoshan JIA Huofu SONG Xiaobo 

机构地区：[1]Research Institute of Exploration and Development,Southwest Branch Company,Sinopec,Chengdu 610041,China

出　　处：《Petroleum Exploration and Development》2021年第6期1329-1340,共12页石油勘探与开发（英文版）

基　　金：Supported by the Scientific and Technological Research Projects of Sinopec(P20059-3);Scientific and Technological Research Projects of Southwest Branch Company(KJ-633-2103).

摘　　要：Based on a large number of field outcrops and cores taken systematically from boreholes,by microscopic observa-tion,physical property analysis,mineralogy analysis,geochemical analysis etc.,reservoir characteristics of the first member of Middle Permian Maokou Formation in Sichuan Basin("Mao 1 Me mber"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 diagene-sis in the early seawater burial stage and the exposure karstification in the early diagenetic stage.It is inferred through th e 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.

关 键 词：Sichuan Basin Maokou Formation limestone-marl alternations tight carbonate reservoir secondary dissolution pore authigenic clay minerals exploration direction 

分 类 号：TE31[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]