元坝地区大安寨段大一亚段沉积相研究及对油气勘探的意义  

The Sedimentary Facies Study of the 1th Sub- Member of Daanzhai Section and Its Significance to Hydrocarbon Exploration in Yuanba Region

作　　者：张腊梅[1] 梁波[1] 

机构地区：[1]中国石化勘探分公司研究院,四川成都610041

出　　处：《延安大学学报（自然科学版）》2015年第2期28-30,38,共4页Journal of Yan'an University：Natural Science Edition

摘　　要：基于测井、岩心、薄片和地震等资料,认为元坝地区大安寨段大一亚段沉积演化划分为大一亚段下和大一亚段上两个阶段,由南向北依次发育半深湖、浅湖和滨湖沉积。随着水体的变浅,大一亚段总体上发育的上下两套浅湖介壳滩逐渐向南迁移。过去认为浅湖介壳滩只是由"纯"介壳灰岩组成的高能介壳滩,本文研究发现,在浅湖靠近滨湖的斜坡上发育一种由薄层介壳灰岩夹泥岩、粉砂质泥岩组成的低能介壳滩。该沉积孔隙和微裂缝相对发育,是一种潜在的储集体,对本区油气勘探和井位部署具有重要的指导作用。Based on well logging,core,thin section and seismic,this text thinks that sedimentary evolution of the 1th sub- member of Daanzhai section can be divided into two stages： upper and lower. It is,from north to south,of semi- deep lake,shallow lake and lakeshore sediments. But with water shoaling in vertical on the plane,the upper and lower shell beach of the 1th sub- member of Daanzhai Section of the Yuanba region moves towards the south. In the past,it was thought that the shallow lake shell beach sedimentation was high- energy shell beach sedimentation which is composed of pure shell carbonate. The studies show that there is low- energy shell beach sedimentation which is composed of thin shell carbonate,mudstones and silty mudstones on the slope of shallow lake near lakeshore. The pore and microcrack is relatively rich in the reservoir,and it is potential reservoir. It is important for oil- gas exploration and well deployment.

关 键 词：元坝地区 大一亚段 高能介壳滩 低能介壳滩 

分 类 号：TE122.2[石油与天然气工程—油气勘探]