收稿日期: 2013-04-26
修回日期: 2013-09-09
网络出版日期: 2014-05-10
基金资助
国家科技重大专项“CO2驱油与埋存关键技术”(编号：2011ZX05016-006)资助.
Significance of Lithology Analyses on the Researches of ConglomerateReservoir Architecture of Alluvial Fan Sediments:Taking Alluvial Fan Reservoirin Some Area of Northwest Margin of Junggar Basin as an Example
Received date: 2013-04-26
Revised date: 2013-09-09
Online published: 2014-05-10
冲积扇砾岩储层作为陆相沉积储层十分重要的类型之一，一直是我国油气勘探开发的重点领域。砾岩储层具有相变快，储层非均质性强等特点。岩性以砾岩、砂砾岩等粗粒岩石类型为主。通过密闭取心井精细岩性分析，将研究区目的层自下而上划分为3套地层。第1套：S47—S327，以砂砾岩为主，夹砂岩、细砾岩、中砾岩和粗砾岩薄层；第2套：S317—S237，以砂岩为主，夹薄层的细砾岩、中砾岩和砂砾岩；第3套：S227—S36，以大套泥岩为主，夹薄层砂岩、砂砾岩、细砾岩和中砾岩。在此基础上，结合测井曲线等多种信息，将储层构型划分为槽流砾石体、片流砾石体等13种4级单元。同时从扇根至扇缘，分析了岩性与主要构型类型之间的对应关系，槽流砾石体和槽滩砂砾体以1~2种砂砾岩、中砾岩等粗粒沉积为主，多形成高渗条带。片流砾石体虽然大面积连片分布，岩石类型以多变为特征，没有一种岩石类型占绝对的主导地位。少量的泥岩等细粒沉积主要以构型界面等沉积特征存在，加剧了储层在空间上的非均质性，增加了储层有效开发的难度。辫流水道、辫流砂砾坝等构型单元，一般由砂砾岩、砂岩等多种岩石类型组成，岩石类型分布特征与片流砾石体基本类似。最后探讨了储层岩性和构型对储层物性及开发的影响。
陈欢庆,赵应成，李树庆，李顺明，王晓光 . 岩性分析对砾岩储层构型研究的意义——以准噶尔盆地西北缘六区克下组冲积扇储层为例[J]. 天然气地球科学, 2014 , 25(5) : 721 -731 . DOI: 10.11764/j.issn.1672-1926.2014.05.721
As one of the most important kinds of reservoir,conglomerate reservoir has always been a key area to explorationists and developers of oilfield.It is characterized by quick changes of sedimentary facies and strong heterogeneity of reservoirs.Lithology of conglomerate and sand-conglomerate took the leading role.On the base of lithology analyses,the strata were divided into three sets.The first set is from S47—S327,and its lithology is dominated by sand-conglomerate.Sandstone,cobble conglomerate,pebble stone and fine conglomerate showed as a thin layer.The second set is from S317—S237,and its lithology is mainly of sandstone.Fine conglomerate,pebble stone and sand-conglomerate presented as thin layer.The third set is from S227 to S36,and mudstone took the leading role.Sandstone,sand-conglomerate,fine conglomerate and pebble stone appeared as thin layer.Based on these researches,the reservoir architecture were carved up into thirteen types with four degrees such as channel flow conglomerate,laminar flow conglomerate and so on.During this process,well logging data and other information were combined.At the same time,relationship between lithology and reservoir architecture were studied.One or two types of lithology of sand-conglomerate and pebble stone took the leading role in reservoir architecture of channel flow conglomerate and channel beach conglomerate,and high-permeability belt often formed at their position.Although laminar flow conglomerate extended like schistose,the types of lithology of it changed quickly.And on type of lithology took the leading role.Some mudstone of fine grain lithology developed as boundary of reservoir architecture,and they strengthened the heterogeneity of reservoir.The difficulty of reservoir development increased.Sand-conglomerate and sandstone formed main body of braided channel and braided sandstone-conglomerate dam.Lithology characteristics of them were similar with laminar flow conglomerate.The influence of lithology and reservoir architecture to reservoir physical properties and reservoir development were discussed later.
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