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利用普通薄片、铸体薄片、扫描电镜等多种分析资料对苏里格气田东中西三个区块盒8段储层的岩石学特征进行系统对比分析。研究发现,由于鄂尔多斯盆地北部物源的差异决定了苏里格气田不同区块岩石类型、碎屑组分、岩屑类型等都存在一定的差异,具体表现为:(1)西区主要由石英砂岩和岩屑石英砂岩组成;东区主要由岩屑砂岩和岩屑石英砂岩组成;中区岩屑石英砂岩比重最大。(2)自西向东,石英类含量减小,岩屑类含量增加。(3)东区岩浆岩岩屑、其它变质岩岩屑和其它岩屑类明显多于中西区;而中西区石英岩含量明显多于东区。在此基础上分析了碎屑组分及填隙物组分对储层物性的影响。
The authors systematically contrasted the petrological characteristics of the 8th member of the 8 blocks in the eastern, middle and western blocks of the Sulige gas field by using many kinds of analysis data, such as ordinary thin films, cast thin films and scanning electron microscopy. The study shows that there are some differences in rock types, detrital components and lithofacies types in different blocks of the Sulige Gas Field due to the differences in provenance in the northern Ordos Basin. The specific manifestations are as follows: (1) The western region is mainly composed of quartz sandstone And lithic quartz sandstones; the eastern part is mainly composed of lithic sandstone and lithic quartz sandstone; the middle part of lithic quartz sandstone has the largest proportion. (2) From west to east, the content of quartz is reduced and the content of cuttings is increased. (3) In the eastern magmatic rock cuttings, other metamorphic rock cuttings and other cuttings are obviously more than those in the central and western regions; while the quartz rocks in the central and western regions are significantly more than the eastern ones. Based on this, the influence of debris and interstitial components on reservoir physical properties was analyzed.