摘要
鄂尔多斯盆地子洲-清涧地区上古生界山2段有效储层为三角洲前缘水下分流河道及河口坝，分为山2^3、山2^2、山2^1三个小层，其中山2^3小层单井产量高、整体产能大，其他2个小层尚未发现工业气流。山2^3小层与山2^2、山2^1小层相比，岩石学特征、物性特征、孔隙类型及孔隙结构等储层基本特征差异较大，综合分析表明沉积作用是导致3个小层储层差异悬殊的根本原因，成岩作用使差异进一步加剧。以石英砂岩为主的山2^3小层河道水动力强，碎屑颗粒分选好、磨圆度高，破坏性成岩作用相对较弱，溶蚀、破裂作用相对较强，储层物性好、有效储集空间多；以岩屑砂岩为主的山2^2、山2^1小层河道水动力弱，碎屑颗粒分选差、磨圆度低，压实作用强，伊利石、伊／蒙混层黏土及碳酸盐矿物的体积分数大，而建设性成岩作用弱，储层物性差、有效储集空间少。
The effective reservoir deposited in underwater distributary river channels of the delta front and mouth bars in Upper Palaeozoic Member Shan2 of Zizhou-Qingjian area in Ordos Basin is separated into Shah23, Shah22 and Shan21 three sublayers. Among them, the individual well production in Sublayer Shah23 is very high and so is the integral output, but the others do not discover any industrial gas flow. Comparing with the later two, there are rather differences for the layer in basic reservoir characteristics such as petrological characteristics, physical proper- ties, pore types and configurations, etc. The comprehensive analysis show that the Sedimentation is the foundational reason to results in the above distinctions, in addition, the diagenesis makes them further anabatie. The layer is mainly characterized by quartz sand, and furthermore the hydrodynamics of it is pretty strong, so the sorting of elas- tic particles is greatly better, the physical properties and effective accumulative space （AS） are much better; the other two are principally characterized by elastic sandstone, the hydrodynamic forces in the river channels are rather weaker, the sorting and roundness are rather poorer, the compactness is strong, the contents of illite and its mixed clay with montmorillonite and carbonate minerals are rather higher, the constructive diagenesis and the physical properties are rather poorer, so the AS is seriously smaller.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2012年第5期19-25,共7页
Petroleum Geology & Oilfield Development in Daqing
基金
国家重点基础研究发展规划“973”项目（2003CB214606）.
