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.
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
