靖边气田西部奥陶系风化壳储层孔隙特征研究

Ordovician weathering crust reservoir pore characteristicson the western Jingbian gasfeild

利用岩心观察、薄片鉴定和多种分析测试资料对靖边气田西部储层孔隙结构特征进行系统研究,表明靖边气田西部风化壳储层主要发育晶间孔、晶间溶孔、膏模孔及溶孔等4种孔隙类型,同时发育构造缝、溶蚀缝、微溶缝、网状微缝、缝合线缝等5种裂缝类型。图版观察和统计表明:岩石中孔径较大的膏模孔和溶孔对油气富集有利,裂缝对沟通储层提高渗流能力起到积极作用,根据孔缝组合分为3种储集空间类型:裂缝-溶孔型、孔隙型、微孔型,其中裂缝-溶孔型是风化壳最好的储集空间类型。

By means of core observation, thin section identification and analysis of test data, a systematic research on the western Jingbian gas field in the pore structure of reservoir, that the weathering crust reservoir is mainly developed intergranular pore, intergranular dissolved pore, gypsum mould pore and dissolved pore. At the same time, the development dissolution fracture, micro soluble seam, mesh slit and Suture line crack. Observation and statistics show, gypsum mould pore and dissolved pore in the rock for oil and gas accumulation is favorable, fracture plays a positive role to improve the ability of reservoir communication and seepage. According to the hole and fracture combination is divided into three kinds of types of reservoir space. Fracture dissolution pore type, pore type, microporous. The fracture dissolution pore type is the best reservoir space types of weathering crust reservoir.