川西南地区下寒武统龙王庙组储层特征  

Characteristics of Lower Cambrian Longwangmiao Formation reservoir in Southwest Sichuan,China

作　　者：孟宪武[1,2] 朱兰[2] 王海军[2] 田景春[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中国石化西南油气分公司勘探开发研究院,贵阳550004

出　　处：《成都理工大学学报（自然科学版）》2015年第2期180-187,共8页Journal of Chengdu University of Technology: Science & Technology Edition

摘　　要：综合钻井、测井及地震资料分析，进一步明确川西南地区下寒武统龙王庙期发育两期局限台地鲕粒、砂屑浅滩，平面上以资阳—磨溪地区为浅滩发育的中心，向四周减薄，纵向上由中心区稳定的早、晚两期浅滩迁移演变为边缘的晚期滩。储层岩性为溶孔微晶－细晶白云岩、滩相砂屑白云岩、鲕粒白云岩，储集空间以粒间溶孔、粒内溶孔、晶间溶孔为主，资阳—磨溪地区为中低孔渗—高孔渗，测井表现为低伽马、低电阻、低密度、较高的声波时差，为孔隙型储层；白云石化是形成储层的基本条件，溶蚀作用对优质储层发育起决定性作用。资阳—磨溪地区储层厚度为30～50 m，孔隙度为4％～6％，发育最好；向南西、南方向储层厚度变为10～30 m，孔隙度为3％～4％，因此，资阳－磨溪地区是龙王庙组油气勘探的最有利区。The comprehensive analysis of drilling,logging and seismic data further makes it clear that there develop two stages restricted platform oolite,sandy beach in Lower Cambrian Longwangmiao Formation of Southwest Sichuan.On the plane,the Ziyang-Moxi area is the development center of beach,thinning to the surroundings and vertically,the early and late stage stable banks in the central area transfer and evolve into the late beach on the edge.The reservoir rocks are the dissolved pore micro-fine crystalline dolomite, beach facies psammitic dolomite, and oolite dolomite, and the reservoir spaces are dominated by the intergranular dissolved pore,intragranular dissolved pore,and intergranular dissolved pore.The physical properties of the reservoir in Ziyang-Moxi area are the middle and low porosity and permeability and the high porosity and permeability.Logging shows as low gamma,low resistance,low density,high sonic time difference,so the reservoir belongs to pore-type reservoir.Dolomitization is the basic condition to form a reservoir,and the corrosion plays a＆amp;nbsp;decisive role in the high-quality reservoir development.In the Ziyang-Moxi area,the reservoir thickness is 30 ~ 50 m,the porosity is 4% ~ 6%,and the reservoir develops the best.To the southwest and the south,the reservoir thickness is 10 ~ 30 m,and the porosity is 3% ~ 4%. Therefore,the Ziyang-Moxi area is the most favorable oil and gas exploration area in the Lower Cambrian Longwangmiao Formation.

关 键 词：川西南地区 龙王庙组 浅滩 孔隙型储层 储层厚度 

分 类 号：TE122.23[石油与天然气工程—油气勘探]