Reservoir Characters of Classic Rocs of the Shanxi Formation at Yi-Meng Area,Northern of Ordos Basin
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摘要: 伊盟地区早二叠世早期山西组发育的冲积扇的扇中砂、砾质辫状河道砂体、曲流点坝及三角洲平原分流河道砂体是本区的主要储集砂体。砂岩主要为富杂基、富岩屑的石英砂岩及岩屑砂岩。储层总体上具有低孔低渗、非均质性强、次生孔隙占主导地位的特点，并按照曲流点砂坝、分流河道、砂、砾质辞状河道沉积的次序储层物性依次变差。依据孔喉分布特点将山西组碎屑岩储层归为为四种类型：中孔低渗型、低孔低渗型、致密型和超致密型，它们的物性依次由好变坏。其中中孔低渗型储层以溶蚀孔和残余粒间扎为主，多发育于南部三角洲平原分流河道砂体及北部的曲流点坝中，为伊盟地区的主要储集层；低孔低渗型储层以晶间孔为主，多发育于冲积扇扇中砂、砾质辫状河道砂体中，在有局部构造存在的条件下可能形成构造背景下的岩性气成；致密型储层以微孔、微缝为主，仅局部地区见油气显示；超致密型储层，基本上无勘探意义。Abstract: sandy-conglomerated braided channel of middle fan, the point-sandbar deposit ofmeandering river and the distributor channel sand of the delta-plain are the main sandstone reservoir of the shanxi formation at the Yi-Meng area. The sand bodies are consisted of quartz sandstone and lithic sandstone with abundant impurity and lithic fragment. It is characterized by the low porosity,low permeability,the heterogeneities and secondary pores predominantly. Their physical property are associated with its depositional micro-facies:the physical property of the point-sandbar deposit,the distributor channel deposit and sandy-conglomerated braided channel gradually become worse and worse. Based on the relationship between pore-throat types,the shanxi formation sandstone reservoir could be classified into four types. Tl}e reservoir of middle porosity and low permeability with solution pore and remainder intergranular porosity is distributed of the point-sandbar deposit and the distributor channel deposit are mainly objective formations of exploration in South Yi-Meng;The reservoir of low porosity and low permeability with intercrystal pore is distributed of the sandy-conglomerated braided channel and can consisted of the lithologic reservoir with tectonic setting;The compacted reservoir with micro-pore and micro-fracture scarcely are discovered oil and gas in the area;The exceed compacted reservoir with no pore and fracture are not discovered oil and gas in the area.
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