摘要
四川盆地上三叠统已成为中国石油西南油气田分公司重要的勘探接替层系,其油气的分布受沉积相控制。测井相分析在研究沉积相和圈定砂体方面具有重要作用。利用测井曲线的形状、幅度、接触关系等基本要素,识别出钟形、漏斗形、箱形、指形和线形等5种基础测井相类型,并通过岩心标定测井,建立了测井相与沉积相之间的函数对应关系;在此基础上,通过单井测井相分析—剖面测井相对比—区域研究3个层次勾画出了上三叠统须二段沉积相的展布。认为四川盆地上三叠统须二段发育冲积扇、三角洲、湖泊3类沉积相,其分布受分别位于川西北部、川东北部、川中和川西南部方向的6大物源控制;由于物源区构造活动强烈,沉积物供应充分,冲积扇和三角洲发育,故滨浅湖沉积分布范围有限。
The Petrochina Southwest Oil and Gasfield Company has considered the Upper Triassic in the Sichuan basin as important supporting strata,where the distribution of oil and gas is controlled by the sedimentary facies.The analysis of log facies plays an increasingly important role in the identification of sedimentary facies and sand body.Depending on the basic elements of logs such as shape,amplitude,and contact relationships,5 kinds of log facies,namely campaniform,infundibuliform,box like,dactyloid,linearis,have been identified.Through demarcation of log facies with core data,the functional relationships between log facies and sedimentary facies have been established.The distributing graph of the sedimentary facies of member 2 of Xujiahe Formation is drawn on the basis of the comprehensive analysis of the log facies of individual wells,the correlation of profiles and the areal study.In this graph,three kinds of sedimentary facies are recognized,namely alluvial fan,delta and lake,the distribution of which are controlled by 6 provenances.Because of intensive tectonic movements and sufficient supply of deposits,the alluvial fan deposits and delta deposits become widespread,while lake deposits are limited in distribution.
引文
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