川东南涪陵地区长兴组储层特征与形成主控因素
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摘要
运用钻井岩心观察、铸体薄片观察、压汞分析等方法,结合测井、录井及地震资料,对研究区长兴组沉积相带展布与储层发育特征进行了研究。结果表明:长一期,台缘礁滩相带主要发育于涪陵兴隆场南部地区;长二期,台缘礁滩相带主要发育于兴隆场北部,台缘礁滩相和台内生屑滩相为储层发育有利的沉积相带。储层岩性主要为残余生屑白云岩、(残余海绵)细粉晶白云岩、生屑灰岩、白云质灰岩;储集空间类型以溶蚀孔隙为主,次为溶洞;储层类型为裂缝-孔隙型,属中孔-中低渗储层,综合评价为Ⅱ、Ⅲ类储层。优质储层发育受沉积相、白云石化及溶蚀作用等因素控制。图4表2参5
Through casting thin-section observation,and core and mercury-injection analysis,both the distribution of sedimentary facies belt and the growth characteristics of Changxing Formation are explored for the study area based on well-logging,mud-logging and seismic data.Results show that(1) during a period of Changxing 1 Member,reef beach facies belt in the marginal platform was mainly developed in the southern Xinglongchang,Fuling area;(2) during another period of Changxing 2 Member,the reef beach facies belt,was mainly developed in the north,and the biodetritus beach facies within the platform were sedimentary facies belts favorable for reservoir growth;(3) reservoir is dominantly composed of residual bioclastic limestone,(residual cavernous) crystal dolomite,bioclastic dolomite and dolomitic limestone;(4) dissolution pore is the main reservoir space,karst cave for the second;(5) reservoir is fractured-porous one,with middle porosity and permeability,and belongs to II-and III-type;and(6) the growth of high-quality reservoir is affected by sedimentary facies,dolomitization and dissolution.
Through casting thin-section observation,and core and mercury-injection analysis,both the distribution of sedimentary facies belt and the growth characteristics of Changxing Formation are explored for the study area based on well-logging,mud-logging and seismic data.Results show that(1) during a period of Changxing 1 Member,reef beach facies belt in the marginal platform was mainly developed in the southern Xinglongchang,Fuling area;(2) during another period of Changxing 2 Member,the reef beach facies belt,was mainly developed in the north,and the biodetritus beach facies within the platform were sedimentary facies belts favorable for reservoir growth;(3) reservoir is dominantly composed of residual bioclastic limestone,(residual cavernous) crystal dolomite,bioclastic dolomite and dolomitic limestone;(4) dissolution pore is the main reservoir space,karst cave for the second;(5) reservoir is fractured-porous one,with middle porosity and permeability,and belongs to II-and III-type;and(6) the growth of high-quality reservoir is affected by sedimentary facies,dolomitization and dissolution.
引文
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3马永生,牟传龙,郭彤楼,等.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,12(3):180-181
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5耿威,郑荣才,李爽,等.开江—梁平台内海槽东段长兴组礁、滩储层特征[J].成都理工大学学报,2008,12(06).
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