鄂尔多斯盆地东部某区上古生界储层物性分析及其影响因素

Physical Property Analysis and Influencing Factors of Upper Paleozoic Reservoir in a Block of the Eastern Ordos Basin

储层物性纵向上差异较大,且纵向上孔隙度和渗透率间的正相关性较为明显,渗透率在纵向上的规律并不明显。测井解释孔隙度的误差较小,可用于储层孔、渗的平面分布图。山西组具有相对较大的渗透率差异,河道砂体展布和含气层段分布与高值区段也有较好的相关性,强烈表明了储层的非均质性。本溪组各井中储层孔隙度最大值为6.4%,最小为0.5%,平均值2.9%。本区控制储集砂体展布及储集砂体孔隙度和渗透率变化的沉积微相主要是三角洲前缘水下分流河道,其砂体比较发育。研究发现:孔隙度、渗透率的变化是与石英含量变化呈正相关的,同时,随着岩屑含量的增加,孔隙度和渗透率降低。本区孔、渗、饱的高值区即为石英砂岩的发育区。

Reservoir properties have quite different in the longitudinal direction; the porosity and permeability show a positive correlation. Law of penetration is not obvious in the longitudinal direction. The error of log interpretation porosity is smaller, and can be used as distribution map of porosity and permeability in flat. Shanxi formation has a relatively large difference in permeability, There are good correlations between channel sand body distribution and high numerical segment, which indicates the heterogeneity of the reservoir. The maximum porosity of Benxi formation is 6.4 %,the minimum porosity is 0.5 %, average porosity is 2.9 %. Microfacies mainly are subaqueous distributary channel of delta front in study area. It＇s found that changes of porosity and permeability have a positive correlation with quartz content change; With increase of lithic content, the porosity and permeability decrease. Development zone of quartz sandstone is the same with the high numerical segment of porosity, permeability and saturation.