Analysis of shale gas geological condition and resource potential in Simao Basin
Based on field investigation and sample testing,the geological condition of shale gas in Simao Basin is analyzed from the geochemical characteristics,physical properties and preservation condition of organic rich shale.The study result shows that there are developed for four sets of dark shale in Simao Basin,Xiami-di Formation,Yangbazhai Formation,Waluba Formation and Hepingxiang Formation.Among them,be-cause the cumulative thickness of shale in Yangbazhai Formation is generally greater than 100 meters,with an average TOC of 1.06％-2.54％and an average Ro of 1.81％-3.47％,and the organic matter type is mainly 112-3 type,with an average brittle mineral content of 49.5％,Yangbazhai Formation is a favorable shale gas layer in Simao Basin.The south part of Jinggu Depression and Puwen Depression are less affected by deep faults,stratigraphic uplift and erosion,magmatic rocks and metamorphic rock belts,and there is a thick cover rock layer,resulting in relatively good condition for shale gas preservation.Simao Basin has a similar oil and gas geological condition to the adjacent Khorat Basin,and there is a certain shale gas resource potential,which is worth further exploration and research work.Finally,for the comprehensive considera-tion of shale distribution,organic geochemical condition,and preservation condition,it is predicted that the favorable target area for shale gas is mainly located in the Mengban-Dehua and Puwen-Xiangming areas.
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