Research On The Characteristics Of Jurassic Yan10+11, Yan8Formation Reservoir And The Disciplinarian Of Accumulation Oil&Gas In Luohe-zhifang Of Zhidan Exploration Area

The ordos Basin is a polycyclic superposition basin,and the largest basincontained three energy sources of petroleum,gas and coal in our country.Zhidan areaLocates in the middle of Shanbei Slope Belt in ordos Basin.The geologic condition ofMesozoic oil and gas is superior, have the abundant oil and gas resources.Yan’anformation of Middle Jurassic in Ordos Basin is a major oil and gas department,Whichwas formed in the steady sedimentation period after the Late Triassic Indo-ChineseMovement,it is great significance to conduct in-depth research in the mid-late Triassicreservoir in yongning oilfield development.In this paper, on the premise of grasp the regional geological background,todetail stratigraphic division,including oil layer yan10+11,yan8,Using sedimentaryfacies analysis and petroleum geology theory research sedimentary facies, reservoircharacteristics, and then discusses its oil enrichment regularity. The yan10+11wastypical braided river channels一filling type deposition,the yan8was delta front faciesin research area.The reservoir rock is feldspathic sandstone,feldspathic quartzite,lithicarkose typically.The pore form is primary origin intergranular pore chiefly.The porousand permeation property is approved generally,and it is mesoporosity,highpermeability integrally.The physical property of the reservoir is affected by the rocktype,rock size and the fragment components.Reservoir of the study area affected by the dual factors of structure andsedimentary, main is a lithologic reservoir structure, the second is lithologic reservoir,reservoir forming model is a combination of delta front on the edge of a deep valleyaccumulation mode, delta front underwater distributary channel model two kinds.The early Jurassic sedimentary was a evolution process which waserosion,compaction,filling.the sediment of yan10+11,their depositionthickness,lithologic characteristic,distribution characteristics of reservoir sand bodyand layer were controlled,by palaeogeomorphology background.For Yan8reservoir,sedimentary facies plays a leading role, nose-like uplift secondary effect to theenrichment of reservoir, oil province basically development in the district of t hick sand body.Synthetizing the reservoir quality,the sealing ability of cap rock,traptypes,reservoir-forming Model in order to analyze the disciplinarian of accumulationoil&gas.Ultimately,many favorable zones were examined.