四川盆地下寒武统龙王庙组储集层形成与演化  

Genesis and evolution of Lower Cambrian Longwangmiao Formation reservoirs, Sichuan Basin, SW China

作　　者：周进高[1,2] 徐春春[3] 姚根顺[1,2] 杨光[3] 张建勇[1,2] 郝毅[1,2] 王芳[1] 潘立银[1,2] 谷明峰 李文正 

机构地区：[1]中国石油杭州地质研究院 [2]中国石油天然气集团公司碳酸盐岩储层重点实验室 [3]中国石油西南油气田分公司

出　　处：《石油勘探与开发》2015年第2期158-166,共9页Petroleum Exploration and Development

基　　金：国家科技重大专项(2011ZX05004-002);中国石油勘探与生产重大项目(2012ZD01-02-03);中国石油重大专项(2014E-3202)

摘　　要：通过野外露头、岩心和薄片观察,结合测井和实验测试资料,深入研究四川盆地下寒武统龙王庙组储集层特征、形成主控因素和演化过程,预测有利储集层分布。龙王庙组储集层以残余砂屑白云岩、鲕粒白云岩和晶粒白云岩为主,储集空间主要为溶孔和溶洞,平均孔隙度为4.28%,储集层平均厚度约36 m,以裂缝-孔洞型储集层为主。储集层形成受颗粒滩、准同生溶蚀和准同生白云石化作用控制。储集层经历4个演化阶段,孔隙形成期奠定储集空间类型和物性条件,表生岩溶期进一步改善储集层的物性,热液矿物充填期孔隙度减小,埋藏溶蚀和沥青充填期使储集层进一步致密化。基于储集层主控因素,预测华蓥山和龙泉山断裂之间的古地貌高带为最有利储集层发育区,广安—南充—剑阁一带有望取得勘探突破。Based on observation of outcrops, cores and thin sections and analysis of logging data and experiment, the features, main controlling factors, evolution and distribution of the Longwangmiao Formation reservoirs in the Lower Cambrian, Sichuan Basin, are examined carefully and the distribution of favorable reservoirs is predicted. Mostly fracture-pore type, the Longwangmiao Formation reservoirs are dominantly comprised of residual dolarenite, oolitic dolomite and crystal dolomite, with dissolution cavities and dissolution pores as the main storage space, an average porosity of 4.28%, and average reservoir thickness of 36 m. The formation of the reservoirs is controlled by grain shoal facies, parasyngenetic dissolution and parasyngenetic dolomitization. The reservoirs have experienced four evolution stages, the period of pore formation laid the foundation for storage space types and physical conditions of the reservoirs; the reservoir physical properties were improved further in the hypergene karstification period; the porosities were decreased by minerals filling during the hydrothermal period; and the reservoirs became denser in the burial dissolution and asphaltic filling period. Based on the main controlling factors of Longwangmiao reservoirs, the high geomorphology area between Huayingshan fault and Longquanshan fault is predicted as the most favorable reservoir zone. Exploration breakthroughs will possibly be made in Guang＇an-Nanchong-Jiange area.

关 键 词：四川盆地 下寒武统龙王庙组 储集层类型 储集层形成主控因素 储集层演化模式 储集层预测 

分 类 号：TE122.2[石油与天然气工程—油气勘探]