泸州古隆起地区嘉一—嘉二段台内滩演化分析  

Platform Shoal Evolution of T_1 j^1 ~ T_1 j^2 in Luzhou Paleohigh Area

作　　者：解发川[1] 郭川[1] 董文玉[1] 罗鹏[2] 

机构地区：[1]成都理工大学,四川成都610059 [2]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《天然气技术与经济》2011年第6期6-10,77,共5页Natural Gas Technology and Economy

基　　金：中国石化石油勘探开发研究院项目(编号:2008ZX05005-002-008HZ)"海相碳酸盐岩层序结构样式;沉积相与构造作用对天然气保存条件的控制研究"资助

摘　　要：四川盆地泸州古隆起地区嘉陵江组时期广泛发育的台内滩具有巨大的勘探潜力,以该区嘉一—嘉二段为研究对象,通过钻井剖面的测井、录井、岩心资料及野外露头的综合分析,认识到层序内不同体系域时期台内滩类型、纵向演化及分布存在较大差异:海侵体系域时期,短暂海退成滩,滩体规模较小,平均厚度为1.8m,滩体多位于古隆起核部,且多在雏滩发育期因海侵淹没而结束;高水位体系域早期,为该区滩体发育的主体时期,海退成滩,以发育鲕粒滩和砂屑滩为主,滩体范围广,古隆起核部及斜坡均有发育,平均厚度可达3.8m,滩体发育晚期因暴露而终止;高水位体系域晚期,海退背景下短暂海侵成滩,以发育鲕粒滩和砂屑滩为主,平均厚度为3.4m,滩体主要分布在古隆起斜坡地区。In Luzhou Paleohigh area of Sichuan Basin, platform shoal developed widespread in Jialingjiang Formation stage is of a huge exploration potential. In this paper, Jialingjiang 1 Member (T 1 j 1 ) to Jialiangjiang 2 Member (T 1 j 2 ) are taken as the study aims. Based on a comprehensive analysis on well-logging and mud-logging data, core analysis and outcrop observation, it is found that for the platform shoal during different system tracts, its type, vertical and lateral evolution and distribution are very different. During transgressive system tract (TST), transient regression occurred to form shoal; and the shoal body with an average thickness of 1.8 m is characterized by small scale and almost located in paleohigh core; and the shoal almost ended due to transgressive flood during the development of embryonic shoal. During early highstand system tract (HST) (the main period of shoal-body development), regression occurred to form shoal; with mainly developed oolitic shoal and sand-cutting shoal, the shoal body with an average thickness of 3.8 m is characterized by large scale and almost located in both paleohigh core and slope; and the shoal ended due to exposure during the later shoal-body development. During later HST, transient regression occurred to form shoal, with mainly developed oolitic shoal and sand-cutting shoal, the shoal body with an average thickness of 3.4 m is mainly developed at the slope of paleohigh.

关 键 词：泸州古隆起 下三叠统 嘉一—嘉二段 台内滩 

分 类 号：P618.130.2[天文地球—矿床学]