Hydrocarbon Accumulation And Main Controlling Factors In Nanyi Member Of Wuerxun Depression

This paper use seismic interpretation data, log data, and the information of geologicalcomprehensively, we have studied the oil and gas pool-forming conditions in Nanyi memberof Wuerxun depression under the guidance of petroleum geology and petrology and othermultidisciplinary knowledge.By drilling exploration wells in well logging data and statistics, with oil well show, wesummarizes the type of Nanyi member of Wuerxun depression, and then we find there arethree reservoir types: fault-lithologic oil-gas reservoirs, small anticline reservoirs and sandlens reservoirs. Further stated that the distribution of oil and gas reservoirs in the study area,On the plane, reservoirs in the main distribution is the Surennuoer, Wudong slope, Bayantala.On the vertical, reservoirs in the main distribution is on the top and the middle of Nanyimember of Wuerxun depression. Through the integrated analysis of forming conditions in thestudy area, we get the main control factors of hydrocarbon accumulation and distributionincludes the area of oil accumulation and distribution of Nanyi member are controlled bysource-rock area; he layer of oil accumulation and distribution of Nanyi are controlled by caprock; the favorable reservoir space of Nanyi member are offered by sandbody of fan deltafront; the favorable places for the oil accumulation of Nanyi member are the tilted upheavalsof antithetic faults; the screen condition for oil accumulation of Nanyi member is provided bythe early extended faults.On the basis of these, combined oil-gas reservoir type we summary out that oil and gaspool-forming models in Nanyi member of Wuerxun depression include: pour uplift compositereverse faults up traps oil and gas accumulation models, composite traps oil and gaspool-forming pattern in depression and depression tank oil-gas reservoir forming of lithologictrap mode. On the basis of the comprehensive study mentioned above, we predict thefavorable exploration areas in Nanyi member of Wuerxun depression and point out thefavorable exploration areas are located in the Surennuoer, Wudong slope and Bayantala.