川东地区下寒武统龙王庙组储层特征及主控因素研究  

The Study on Reservoir Characteristics and Main Controlling Factors of Lower Cambrian Longwangmiao Formation in Eastern Sichuan Basin

作　　者：胡忠贵[1] 吴松[1] 郭艳波[2] 张文济[2] 李世临[2] 左云安[2] 黄宇飞 Hu Zhonggui;Wu Song;Guo Yanbo;Zhang Wenji;Li Shilin;Zuo Yun’an;Huang Yufei(Sedimentary Basin Research Center,Yangtze University,Wuhan 430100,Hubei;Chongqing Gas Mine,Southwest Oil&Gasfield Company,PetroChina,Chongqing 400021)

机构地区：[1]长江大学沉积盆地研究中心,湖北武汉430100 [2]中国石油西南油气田分公司重庆气矿,重庆400021

出　　处：《长江大学学报（自然科学版）》2020年第5期1-9,I0001,共10页Journal of Yangtze University(Natural Science Edition)

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05007002);中国石油天然气股份有限公司西南油气田分公司项目“达州奉节地区下寒武统地质特征研究”(XNS02JS2019-0036);“川东地区震旦系下古生界沉积及储层特征研究上寒武统、震旦系沉积相研究和分析化验”(XNS02JS2019-0059)。

摘　　要：龙王庙组是四川盆地研究的热点层位之一,川东地区龙王庙组规模资源前景广阔,但对储层及主控因素的研究相对较少。基于野外剖面、新井及岩心观察资料,结合薄片鉴定分析和物性资料统计,持续推进川东地区下寒武统龙王庙组储层特征的研究。研究表明,川东地区下寒武统龙王庙组储层主要发育于(残余)鲕粒白云岩、砂屑白云岩及晶粒白云岩中,储集空间类型主要有(残余)粒间孔、晶间溶孔、粒间(溶)孔、粒内溶孔和铸模孔等。露头、岩心及测井孔隙度分析表明研究区孔隙度整体偏低,分布范围较大,非均质性较强,孔隙度和渗透率呈现较好的正相关性,龙王庙组储集类型总体以裂缝孔隙型为主。储层发育受岩性、沉积相和成岩作用的叠加控制。岩性差异与储层发育关系密切,颗粒滩是储层发育的物质基础,成岩作用对储层的改善至关重要。起建设性作用的溶蚀作用、白云石化作用和破裂作用是研究区优质储层形成的关键。The Longwangmiao Formation is one of the hot spots of the research on Sichuan Basin.The scale resources of the Longwangmiao Formation in the eastern Sichuan region are promising,but there are relatively few studies on reservoirs and the main controlling factors.Based on the field profiles,new drilling wells and core observation data,identification analysis in combination with slice and physical data statistics,the research on the reservoir characteristics of the Lower Cambrian Longwangmiao Formation in the eastern Sichuan basin was continuously promoted.The studies have shown that the reservoir of the Lower Cambrian Longwangmiao Formation in the eastern Sichuan basin is mainly developed in oolitic dolomite(residual dolomite),sandy dolomite,and grain dolomite,and the types of storage space mainly include(residual)intergranular pores,intercrystalline solution pores,intergranular(dissolved)pores,intragranular dissolved pores,mold pores,etc.,The analysis of outcrop,core and logging porosity shows that the porosity of the study area is generally low,the distribution range is large,the heterogeneity is strong,the porosity and permeability show a good positive correlation,and the reservoir types of Longwangmiao Formation are mainly fracture-pore type.Reservoir development is controlled by the superposition of lithology,sedimentary facies and diagenesis.The difference in lithology is closely related to the reservoir development,the grain bank is the material basis for reservoir development,and diagenesis is crucial to the improvement of reservoir.Dissolution,dolomitization and rupture have played a constructive role in the formation of high-quality reservoirs in the study area.

关 键 词：川东地区 下寒武统 龙王庙组 储层特征 主控因素 

分 类 号：P618.13[天文地球—矿床学]