Dominant Transport Channels And Their Control On Oil And Gas Distribution In The Middle Member Of Es3 In Daliuquan Area Of Langgu Sag

Daliuquan area is located in the middle of Langgu Sag,which is the main area of oil and gas accumulation and has broad prospects for exploration and development.With the deepening of exploration work,petroleum geologists have found that faults are well developed in Daliuquan area,and the types of faults are complex and diverse.At the same time,the oil and gas in this area are mainly distributed near faults.However,oil and gas are not distributed near all types of faults in Daliuquan area;Moreover,for the same fault,oil and gas are not evenly distributed near it.It is undeniable that the enrichment degree and distribution characteristics of oil and gas in Daliuquan area are closely related to the development and distribution characteristics of faults.In addition,although faults are well developed in this area,and oil and gas in the middle member of Es₃are mainly distributed near large oil source faults,in a short distance,the enrichment degree and distribution characteristics of oil and gas in this sub-member are still closely related to the development and distribution characteristics of sand bodies.Therefore,this paper uses the existing regional geological data,geochemical data,seismic data,mud logging data,logging data,test data and oil testing data in Daliuquan area.By studying the distribution characteristics of oil source faults and their dominant transport channels and sand body dominant transport channels and their distribution characteristics,combined with the distribution characteristics of oil and gas,the control effect of the dominant transport channels on the oil and gas distribution of the middle member of Es₃in Daliuquan area is analyzed,in order to provide a theoretical basis for its next stage of oil and gas exploration and development.Based on the above research,the following six achievements and understandings have been obtained:(1)There are 9 oil source faults in the middle member of Es₃in Daliuquan area,namely F1 fault,F2 fault,Jiuzhou fault,Liuquan fault,Zhongchakou fault,Caojiawu fault,F3fault,Wangju fault and F4 fault.(2)The dominant transport channels of oil source faults in the middle member of Es₃in Daliuquan area are relatively developed,with a total of 29developed,of which the Jiuzhou fault is the most developed,with a total of 12 developed;Liuquan fault,Zhongchakou fault,Caojiawu fault,F3 fault,Wangju fault,F2 fault,F1 fault and F4 fault have few dominant transport channels,ranging from 1 to 3.(3)The dominant transport channels of sand bodies in the middle member of Es₃in Daliuquan area are relatively developed,with a total of 16 developed,mainly distributed in the middle and east,and a small amount distributed in the west,with a short extension distance.The migration direction is mainly from northeast to south,and a small amount is from west to south.(4)There are mainly three types of oil and gas reservoirs in the middle member of Es₃in Daliuquan area,namely fault block oil and gas reservoirs,fault nose oil and gas reservoirs and fault shielded oil and gas reservoirs;The middle member of Es₃in Daliuquan area is rich in oil and gas,with a large number of oil and gas producing wells and generally good oil and gas bearing property.It is mainly distributed in Liuquan anticline,Liuquan north anticline,Liuquan east anticline,Gu'an anticline,Caojiawu anticline,Wangju anticline and Hupoying anticline,and a small amount is distributed in Qianshijiawu anticline,Zhongchakou anticline,Shifosi fault nose and Jiuzhou fault nose.(5)The dominant transport channel of the middle member of Es₃in Daliuquan area controls the oil and gas accumulation position,and the oil and gas flow wells are mainly distributed in the range of 1.5 km away from the dominant transport channel of the oil source fault or the dominant transport channel of the sand body configured with the dominant transport channel of the oil source fault.(6)There are 7dominant oil and gas transporting areas in the middle member of Es₃in Daliuquan area,with a total area of 58.51 km².