川东地区大安寨段岩石类型及其组合特征的勘探意义  

Rock Types and Their Association Characteristics and Significance for Exploration in the Da'anzhai Member,Eastern Sichuan

作　　者：刘达望 张文济 任康绪[1] 邓西里[1] 李世临 吕洲 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油西南油气田重庆气矿,重庆400021

出　　处：《科学技术与工程》2018年第6期73-80,共8页Science Technology and Engineering

基　　金：国家科技重大专项(2017ZX05013-006);中国石油勘探开发研究院院级项目(2016yj01)资助

摘　　要：四川盆地下侏罗统自流井组大安寨段一直是四川盆地致密油勘探的重要层位之一,近年的勘探成果显示出了大安寨段具有良好的潜力与前景。川东地区具有和川中地区相似的资源和成藏有利区,但多年来未受到足够的重视。通过对川东地区26条大安寨段野外露头资料整理以及结合前人的认识,总结了川东地区大安寨段的岩石类型及其组合特征,按照生屑的含量、填隙物特征及对岩石物性影响较大的重结晶作用,将灰岩类和泥(页)岩类分为生屑灰岩、泥晶灰岩、结晶灰岩、介壳质泥(页)岩和钙质泥(页)岩5类,再进一步将生屑灰岩和泥晶灰岩类细分为7个亚类;综合"源、带、相"的勘探思路,分析了4种主要岩性组合对寻找致密油"甜点"的影响,对下步川东大安寨段致密油(气)的勘探具有重要意义。The Da'anzhai member of the Ziliujing Formation in Lower Jurassic in the Sichuan Basin has been one of the important strata of the tight oil exploration in the Sichuan Basin. In recent years,the exploration results show that Da'anzhai has good potential and prospects. The eastern Sichuan Basin has similar resources and reservoirs in the middle Sichuan Basin,but has not received enough attention for many years. Based on the data of 26 outcrops in Da'anzhai member of eastern Sichuan Basin and the combination of previous understanding,the rock types and their association characteristics of Da'anzhai member in eastern Sichuan region are summarized. According to the content of biological debris,the characteristics of interstitial fillings and the recrystallization,the limestone and mudstone( shale) are divided into biological debris limestone,micritic limestone,crystalline limestone,shell mudstone( shale) and calcareous mudstone( shale). And further subdivided the biological debris limestone and micritic limestone into seven subclasses. Based on the exploration of "source,zone and facies",the influence of four major lithological association on the discovery of tight oil "sweet zone"is analyzed,which is of great significance to the exploration of tight oil( gas) in Da'anzhai member in eastern Sichuan Basin.

关 键 词：川东 大安寨段 岩石类型 岩性组合 

分 类 号：P618.13[天文地球—矿床学]