开江—梁平海槽东侧长兴组沉积组合类型及分布规律  

Sedimentary assemblage type and distribution law of Changxing Formation on the east side of Kaijiang-Liangping trough

作　　者：左洺滔 胡忠贵[2,3] 李世临 陈卫东 朱宜新 孙玉华 ZUO Mingtao;HU Zhonggui;LI Shilin;CHEN Weidong;ZHU Yixin;SUN Yuhua(Research Institute of Petroleum Exploration and Development-Northwest,PetroChina,Lanzhou 730020,China;School of Geosciences,Yangtze University,Wuhan 430100,China;Sedimentary Basin Research Center,Yangtze University,Wuhan430100,China;Chongqing Gas Field,Southwest Oil and Gas Field Company,PetroChina,Chongqing 402160,China;Zhongyuan Measurement and Control Company,Sinopec Matrix Corporation,Puyang 457001,China)

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]长江大学地球科学学院,湖北武汉430100 [3]长江大学沉积盆地研究中心,湖北武汉430100 [4]中国石油西南油气田公司重庆气矿,重庆402160 [5]中国石化经纬有限公司中原测控公司,河南濮阳457001

出　　处：《断块油气田》2022年第1期60-65,共6页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项课题“重点海相层系构造-沉积响应与有利储层分布预测”(2016ZX05007-002)。

摘　　要：以野外露头剖面、岩心及薄片观察为基础,结合测、录井以及地震等资料,对川东地区开江—梁平海槽东侧长兴组沉积组合类型及分布规律进行了研究。结果表明:长兴组沉积组合可分为生物礁型及无生物礁型2类。其中,生物礁型沉积组合细分为台缘礁+台缘滩、台缘礁+台内滩、台缘礁+无滩、台内礁+台内滩、台内礁+无滩等5个亚类,无生物礁型沉积组合细分为无礁+台缘滩、无礁+台内滩、台缘滩+台内滩及无礁+无滩等4个亚类。长兴组发育陡坡型台缘礁及缓坡型台缘礁,2种生物礁呈现不同的沉积组合规律。前者为台缘礁+台缘滩沉积组合;而后者主要为台缘礁+无滩沉积组合,可见少量白云岩化的台缘礁+台缘滩沉积组合。研究成果为该区长兴组生物礁下一步的油气勘探提供了理论依据。Based on the observation of field outcrop profiles,cores and thin sections,combined with the data of logging,mud logging and seismic interpretation,the sedimentary assemblage type and distribution law of Changxing Formation on the east side of Kaijiang-Liangping trough in eastern Sichuan Basin are studied.The results show that the sedimentary assemblages of Changxing Formation can be divided into two types:reef sedimentary assemblages and non-reef sedimentary assemblages.Furthermore,the reef sedimentary assemblage can be divided into five types such as platform margin reef+platform margin beach,platform margin reef+intra-platform beach,platform margin reef+non-beach,intra-platform reef+intra-platform beach and intra-platform reef+non-beach.There are four types of non-reef assemblage:non-reef+platform margin beach,non-reef+intra-platform beach,platform margin beach+intra-platform beach and non-reef+non-beach.The Changxing Formation develops steep-slope type platform margin reefs and gentle slope type platform margin reefs,and the two reef types show different sedimentary assemblage law.The former develops platform margin reef+platform margin beach sedimentary assemblage.The latter is mainly platform margin reef+non-beach sedimentary assemblage,with a small amount of dolomitic platform reef+platform beach assemblage.The research results provide a theoretical basis for further oil and gas exploration of Changxing Formation reefs in this area.

关 键 词：生物礁 沉积组合类型 分布规律 成因 长兴组 川东地区 

分 类 号：TE121.32[石油与天然气工程—油气勘探]