四川盆地震旦系灯影组储层特征及成因

发布时间：2018-03-09 20:29

本文选题：震旦系　切入点：微生物　出处：《东北石油大学学报》2016年02期 　论文类型：期刊论文

【摘要】：为明确四川盆地震旦系灯影组的储层特征及成因,以钻井岩心、薄片观察、扫描电镜和碳氧稳定同位素分析等资料为基础,分析研究区储层的储集空间类型及储层特征、成因。结果表明:灯影组储集岩类以凝块状云岩、砂屑云岩为主,储集空间以次生孔隙、溶蚀孔洞为特征;沉积相是储层的物质基础,藻丘和颗粒滩亚相控制储层在平面上的分布范围和规模;溶蚀是储层形成的关键,同生期溶蚀增加储层的比表面积,为后期岩溶提供有利的物性条件;表生期溶蚀控制优质储层在纵向上的分布,主要分布在距离不整合面100m以内;埋藏期溶蚀对储层总孔隙度改变不大,但使前期较分散的储层趋于富集。早期裂缝(第一~三期)为各期流体及烃类充注提供导引作用,晚期裂缝(第四~五期)改善灯影组储层的渗透能力。该结果对研究区气田的勘探和开发具有参考意义。
[Abstract]:In order to clarify the reservoir characteristics and genesis of the Dengying formation of the Sinian system in Sichuan Basin, the reservoir space types and reservoir characteristics of the studied area are analyzed on the basis of drilling core, thin slice observation, scanning electron microscope and carbon and oxygen stable isotope analysis. The results show that the reservoir rocks of Dengying formation are condensed block dolomite, sand dolomite is dominant, reservoir space is characterized by secondary pores and dissolved pores, and sedimentary facies are the material basis of reservoir. The distribution range and scale of the reservoir are controlled by algal dune and granular shoal subfacies, dissolution is the key of reservoir formation, and the syngenic dissolution increases the specific surface area of the reservoir, which provides favorable physical properties for the later karst. Supergene dissolution controls the vertical distribution of high quality reservoir, mainly within 100m from unconformity surface, and the total porosity of reservoir is not changed by dissolution in burial period. The early fractures (the first to the third stage) provide guidance for fluid and hydrocarbon filling in each stage, but the early dispersed reservoirs tend to be enriched, and the early fractures (the first to the third stage) provide guidance for the filling of fluids and hydrocarbons in each stage. The late fractures (4th ~ 5) improve the permeability of the reservoir in Dengying formation. The results are of reference significance for the exploration and development of gas fields in the study area.
【作者单位】：中国石油西南油气田分公司勘探开发研究院;四川路桥矿业投资开发有限公司;
【基金】：国家科技重大专项(2011ZX05004-005) 中国石油天然气股份有限公司重大科技专项(2013E-050208)
【分类号】：P618.13

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