陆东凹陷前河地区上侏罗统层序地层与沉积体系特征  

SEQUENCE STRATIGRAPHY AND SEDIMENTARY SYSTEM CHARACTERISTICS OF UPPER JURASSIC IN QIANHE AREA OF LUDONG DEPRESSION

作　　者：雷霄雨 LEI Xiao-yu(Research Institute of Exploration ＆ Development ,Liaohe Oil Field Company,Petro China ,Panjin 124000,China)

机构地区：[1]中国石油辽河油田勘探开发研究院,辽宁盘锦124000

出　　处：《矿物岩石》2016年第4期104-114,共11页Mineralogy and Petrology

摘　　要：利用该区8口系统取心井的岩石薄片、粒度分析、古生物等资料,以层序地层学理论为指导,在层序界面识别的基础上,建立陆东凹陷前河地区层序地层格架。并将上侏罗统划分为1个Ⅱ级层序和3个Ⅲ级层序,自下而上分别对应九佛堂组、沙海组、阜新组。其中九佛堂组层序发育完整,由低水位体系域、水进体系域和高水位体系域组成,沙海组由湖侵及高位体系域组成,阜新组由湖退体系域组成。根据层序分析结果,对层序格架内的沉积体系类型和沉积相特征进行分析,编制了前河地区九佛堂组及沙海组各个体系域的沉积相图,结果表明九佛堂、沙海时期陡坡一侧以近岸水下扇沉积为主,发育岩性—构造圈闭。西北缓坡带以扇三角洲及滨浅湖滩坝沉积为主,发育地层超覆及透镜体圈闭。Based on the theory of sequence stratigraphy, the characteristics of sequence stratigraphy of upper Jurassic of Ludong depression in the Qianhe area is established by comprehensive researches of grain size analysis,paleontology data and sequence interface from 8 drilling cores. One 2^nd order stratigraphic sequence and three 3^nd order stratigraphic sequences in upper Jurassic are discriminated,they are Jiufotang Formation,Shahai Formation and Fuxin Formation from bottom to top. Jiufotang Formation sequence develops completely,composed of low stand systems tract, transgressive systems tract, high stand system tract. Shahai Formation sequence is composed of transgressive systems tract and high stand system tract. Fuxin Formation sequence consists of regressive systems tract. Depositional facies maps of Jiuft Formation and Shahai Formation in each systems tract are compiled by analyzing the characteristics of sedimentary system types and sedi- mentary facies of the sequence framework. It is concluded that structural-lithological traps developed in the steep slope zone in the form of underwater fan deposit,the stratigraphic overlap traps developed in the northwest slope zone in the form of fan delta, and the sandstone lens traps developed in the shallow lake in the form of beach bar.

关 键 词：前河地区 上侏罗统 层序地层 沉积体系 

分 类 号：TE121.34[石油与天然气工程—油气勘探]