摘要
首次分析睡宝盆地A井区古近系成岩演化序列并提出其储层处于中成岩A1-A2期,此成岩阶段有利于次生孔隙的保护。研究区古近系储层成岩演化序列具有特殊性：第一期胶结作用为硅质胶结,早于机械压实作用或者同时进行,强烈的机械压实作用使得孔隙度减小15%,此后第二期碳酸盐胶结作用占主导,镜下统计两期胶结作用的减孔量为4%~6%;渐新世受到挤压构造运动和表生成岩作用的双重影响,紧临渐新统不整合面以下的储层由于碳酸盐胶结物溶解而形成次生孔隙。2009年中海油新钻井地处冲起构造,后期的这种构造变形对始新统及其以下的核部地层产生侧向挤压形成构造压实效应,原始孔隙遭到更多的破坏,而对渐新统起到构造托举的作用,可以减缓上覆沉积物的静岩压实效应。成岩演化序列的特殊性和多期构造运动使得古近系储层物性出现差异,总结储集性好的储层并分析其成因机制,对睡宝盆地下一步勘探具有重要指导意义。
The Paleogene reservoir diagenesis of well A in Shwebo Basin is studied.It is during the middle diagenetic A1 and A2 stages,which is good for secondary porosity.Paleogene reservoir diagenesis evolution is special in research block： the first cementation was silicon cement happened before or simultaneously with the compaction.The second cementation was calcite cement and happened after the main compaction and porosity decreased by 15%.Thin section microscopy research shows that the two cementation reduced porosity by 4%~6%.Hypergenesis and the related tectonic squeezing movement are the controlling factors to the forming of Oligocene reservoir secondary porosity.New well of CNOOC in 2009 is located in pop-up and the lateral structure compression would influence deep layer sandstone diagenesis and porosity,but structural uplift to the upper reservoir would reduce the compaction.Special diagenetic evolution sequences and multiphase tectonic activities control the Paleogene reservoir quality.Deep research on the reservoir diversity and the mechanism of secondary porosity are important to the exploration in Myanmar.
出处
《海洋石油》
CAS
2010年第4期26-31,共6页
Offshore Oil
基金
中海石油(中国)有限公司科技攻关项目(编号:2009-HW-03-1)
关键词
睡宝盆地
成岩作用
孔隙演化
构造压实效应
次生孔隙
Shwebo Basin
diagenesis
porosity evolution
structure compression
secondary porosity
