Research On Favorable Position Of Hydrocarbon Migration And Accumulation In The Fault-sand Configuration Of Nantun Formation In Wubei Area Of Hailar Basin

Wubei area is located in Wuerxun depression in Beierhu depression of Hailar basin,and is the main oil and gas reservoir area in this area.However,due to the complex geological environment in northern Ukraine,although the region has the conditions to form oil and gas reservoirs,it is difficult to fully exploit the oil and gas in complex areas due to the small amount of oil and gas extracted from proven reserves.Therefore,the purpose of this thesis is to accurately find the favorable locations for oil and gas accumulation in the northern region of Wubei through studying the favorable locations for oil and gas migration and accumulation,so as to economically exploit oil and gas.This thesis systematically analyzes the dominant path of fault transporting oil and gas,the dominant path of sand body transporting oil and gas,and the trap development location of fault sand configuration in the Nantun Formation(K1n)of the research area through logging and other data in the northern region of Wubei.Finally,combined with the distribution law of oil and gas plane profile in the northern region of Wubei,it studies the favorable location of fault sand configuration transporting and accumulating oil and gas in the northern region of Wubei,and determines which areas the oil and gas are generally distributed in,provide conditions for the next step of work.Through research,the achievements of this thesis mainly include four aspects:(1)There are twenty two dominant paths of oil and gas transmission through faults distributed in the southern K1n1 and K1n2 of the northern Wubei region,which are concentrated in the south of the northern Wubei region and near the fault zones in the northern Wubei region;The dominant paths for oil and gas transport in sand bodies are characterized by twelve in N1Ⅰ,nine in the South of N2Ⅱ,and eleven in the South of N2Ⅰ,mainly concentrated in the north of the study area and a small part in the central region;In the study area,there are two types of advantageous paths for transporting oil and gas with fault sand configurations,namely,Type I and Type II.The advantageous paths for transporting oil and gas with type I fault sand configurations are distributed in the north of the study area and a small number of eastern regions,while the advantageous paths for transporting oil and gas with type II fault sand configurations are mainly distributed in the north of the study area.(2)The dominant path for transporting oil and gas through fault sand configuration can only form oil and gas reservoirs through the trap development position of fault sand configuration,otherwise there is no oil and gas distribution;Finally,it is obtained that the fault sand configuration traps in the southern section of the northern Wubei area are concentrated in the northern and central areas of the study area,near the northern fault zone of the northern Wubei area.The faulted sand configuration traps in the South of N2Ⅱ are concentrated in the central north of the northern Wubei area,while only a small number of faulted sand configuration traps are formed in the eastern area.The faulted sand configuration traps in the South of N2Ⅰ Member are mainly distributed in the northern and central regions of the study area.Although the fault is laterally sealed in the western region,due to the few connected parts of the sand body,only some regions can form faulted sand configuration traps.(3)The favorable location for the migration and accumulation of hydrocarbon in the Class I fault sand configuration of the K1 n in the northern Wubei area is mainly concentrated in the north of the study area,and a small amount is distributed in the east;Most of the favorable locations for hydrocarbon migration and accumulation of Class II fault sand configuration are concentrated in the north of the study area,and a few are distributed in the middle of the study area.(4)Hydrocarbon are mainly distributed at and near the favorable location for hydrocarbon migration and accumulation of type I fault-sand configuration,and a small amount are distributed at the favorable location for hydrocarbon migration and accumulation of type II fault sand configuration,which indicates that the hydrocarbon accumulation of the K1 n in Wubei area is mainly controlled by the favorable location for hydrocarbon migration and accumulation of fault sand configuration.The above thesiss can provide a theoretical basis for the next hydrocarbon exploration of the K1 n in Wubei area.