靖边气田马五_4~1储层成岩作用及孔隙演化  

DIAGENESIS AND PORE EVOLUTION OF MAWU_4~1 RESERVOIR IN JINGBIAN GASFIELD

作　　者：陈凤喜[1] 王东旭[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院

出　　处：《天然气勘探与开发》2012年第1期22-26,80,共5页Natural Gas Exploration and Development

摘　　要：鄂尔多斯盆地北部靖边气田奥陶系马家沟组马五41气藏储集岩为颗粒白云岩、粗粉晶白云岩和细粉晶白云岩;储集空间以溶蚀孔洞为主,裂缝是提高储层渗流能力的有利通道;溶孔-裂缝型、晶间孔-裂缝型储层是研究区最主要的储层。压实与压溶作用使原生孔隙几乎丧失贻尽,表生期的溶蚀作用对马五41储层的最终形成起到至关重要的作用。加里东末期的岩溶作用形成最大的次生孔隙,其对于储集空间的贡献优于原生孔隙。以上因素相互匹配形成了研究区良好的天然气储层。In the Mawu 4 1 Member,Ordovician Majiagou Formation in Jingbian gasfield of northern Ordos Basin,its reservoir rock is composed of granular dolomite,coarse crystal dolomite and crystal dolomite;the reservoir space is mainly solution vug,and fractures are favorable channel to improve a reservoir-permeability capacity;the most important reservoirs in this study area are made up from vug-fractured and intergranular pore-fractured ones.Both compaction and pressure solution nearly make primary pore missing.However,dissolution in the exogeneous stage is important to form Mawu 4 1 Member.The largest secondary pore,which contributes to reservoir space better than primary pore,is formed by karstification at the end of Caledonian stage.These factors match together to from better gas reservoirs.

关 键 词：靖边气田 马五41段 成岩作用 孔隙演化 次生孔隙 

分 类 号：P618.13[天文地球—矿床学]