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榆林气田上古生界储层发育广泛,其上古生界地层为石炭系-二叠系,石炭系包括本溪组和太原组,为一套海相沉积。山西组为一套煤系地层,属于三角洲平原沉积。通过岩心薄片、铸体薄片、压汞测定、扫描电镜等实验方法,对榆林气田长北区块山1段的砂体展布特征、储层特征以及成岩作用等进行了研究。研究表明:榆林气田长北区块山1段属于低孔低渗储层;岩性以岩屑石英砂岩和岩屑砂岩为主;长北区块主要发育原生粒间孔隙、次生溶孔、高岭石晶间微孔隙和微裂隙四类孔隙;成岩作用对储层物性有着重要的意义。榆林气田长北区块山1段的储层特征的研究,为进一步开发榆林气田长北区块提供了科学依据。
The upper Paleozoic reservoirs in Yulin gas field are widely developed. The Upper Paleozoic strata are Carboniferous-Permian, Carboniferous including Benxi and Taiyuan formations, and are a set of marine sediments. Shanxi Formation is a set of coal strata, belonging to the delta plain sediments. Sandstone distribution characteristics, reservoir characteristics and diagenesis of Block 1 in Changbei section of Yulin gas field were studied by means of experiments such as core slice, cast slice, mercury intrusion measurement and scanning electron microscope. The results show that the first block of Block Wushan in the Changbei section of Yulin gas field belongs to the low-porosity and low-permeability reservoirs. The lithology is dominated by lithic quartz sandstone and lithic sandstone. The main intergranular pores, secondary dissolved pores, Kaolinite intergranular micropores and micro-fissures four types of diagenesis; diagenesis has important significance on reservoir physical properties. The research on reservoir characteristics of Block 1 of Changbei Block in Yulin Gas Field provides a scientific basis for further development of the Changbei Block of Yulin Gas Field.