四川盆地上三叠统须二段测井沉积相研究
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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.
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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[2]胡明毅,李士祥,魏国齐,等.川西前陆盆地上三叠统须家河组致密砂岩储层评价[J].天然气地球科学,2006,17(4):456-458.
[3]李士祥,胡明毅,李浮萍.川西前陆盆地上三叠统须家河组砂岩成岩作用及孔隙演化[J].天然气地球科学,2007,18(4):535-539.
[4]梁西文,何文斌,盛贤才.四川盆地东缘上三叠统须家河组沉积特征[J].华南地质与矿产,2006,(1):59-65.
[5]林良彪,陈洪德,姜平,等.川西前陆盆地须家河组沉积相及岩相古地理演化[J].成都理工大学学报,2006,33(4):376-383.
[6]魏国齐,刘德来,张林,等.四川盆地天然气分布规律与有利勘探领域[J].天然气地球科学,2005,16(4):437-442.
[7]张金亮,王宝清.四川盆地中西部上三叠统沉积相[J].西安石油学院学报:自然科学版,2000,15(2):1-6.
[8]赵希刚,吴汉宁,王靖华,等.综合测井资料在研究油气藏沉积相中的应用——以川口油田和六油层组为例[J].地球物理学进展,2004,19(4):918-923.
[9]曹广华,胡亚华,张奇文,等.利用测井资料识别沉积微相方法研究[J].科学技术与工程,2007,7(15):3674-3680.
[10]郭正吾,邓康龄,韩永辉.四川盆地形成与演化[M].北京:地质出版社,1996:70-116.
[11]王宓君.中国石油地质志(卷十)[M].北京:石油工业出版社,1987:67-69.
目录