The Characteristics Of Fault And Its Relationship To Hydrocarbon Accumulated In The Two Northern Areas Of Tarim Basin

Fracture's propertie directly influence oil and gas migration,accumulation and preservation.Faults in the Tarim Basin,according to the predecessor's statistics on the abundance of oil and gas,controls their output strictly.The plane along the fracture showed oil and gas is distributed in cluster,in vertical layers cut by fractures have signs of oil and gas.At present,the Tarim Basin Bachu-Awati area,Bachu-Keping area in the north slope of the strike slip fault and Bachu fault in Mengaiti area,Tazhong No.lstructural zone and Shuntuoguole fault all showed that the faults and reservoirs have close relationship.In this paper,under the theoretical guidance of the oil and gas geology,tectonic geology and other disciplines,I analyze the characteristics of fracture system from the aspect of seismic data,the fracture tectonic style,distribution,fracture formation time in the two-northern area,and sum up their characteristics of the tectonic evolution of this regions.Based on the analysis of the forming conditions of reservoir and the relationship between faults and oil-gas reservoirs in the two northern areas,and combining with the analysis and comparison of typical oil wells,this paper finds out the main controlling factors and forming rules of oil and gas reservoirs of two-northern area and the main controlling factors of hydrocarbon accumulation in different periods of fractures forming,summed up the reservoir model of two-northern area.The tectonic activities in two-northern area are divided into three periods,early middle Caledonian,late Caledonian to Hercynian,Yanshan Himalayan period.The strongest tectonic movement is in the Caledonian to Hercynian.Due to the north and south extrusion pressure during Caledonian to Hercynian period,the formation of NE NW"X" shear faults provides a channel for oil and gas migration.Two-northern area is mainly composed of Cambrian Ordovician source rocks,with high organic matter abundance,high maturity and strong hydrocarbon generating ability,and forming a good combination of reservoir cap rocks.The two northern regions are between the uplift of Shaya and Tazhong oil and gas enrichment zone,are also located Shaya uplift slope zone,special geographical position is advantageous reservoir facies development,but also the long-term oil and gas migration direction and pool area,Awati sag-Manjaer depression is the necessary path of Shaya uplift migration,storage,and eastern of Awati is in the main body of Shaya uplift Crabbe divergence of the brush structure,is an important area for oil fields.