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通过岩心铸体薄片、压汞分析等手段,对鄂尔多斯盆地大东沟区延长组长8储层物性、储层特征及影响因素进行了研究分析。结果表明:大东沟区长8储集岩石类型主要为长石岩屑砂岩;孔隙类型为原生孔隙、次生孔隙和裂缝;渗透率和孔隙度两者之间存在线性关性;总的说,直罗油田大东沟区三叠系延长组长8油层组储集层表现为低孔低渗的特征。
The physical properties, reservoir characteristics and influencing factors of Chang 8 reservoir of Daconggou Formation in Dadonggou area, Ordos Basin, are studied by the means of casting thin film and mercury intrusion analysis. The results show that the Chang 8 reservoirs in Dadonggou area are mainly feldspathic lithic sandstones; the types of pores are primary pores, secondary pores and fractures; there is a linear relationship between permeability and porosity; in general The reservoirs of Chang 8 reservoir of Triassic Yanchang Formation in Dadonggou area of Zhiluo Oilfield are characterized by low porosity and low permeability.