Hydrocarbon Accumulation Conditions And Favorable Exploration Zones In Nantun Formation Southern Area Of Beixi

The research area is located in the southwest of bell sag in hailaer basin,which is the most abundant baixi trough in beibei bell sag,and the west depression in nanbeibei depression.According to the fault basin subsags containment,the characteristics of the proximal accumulation,restriction factors of oil and gas exploration in the area mainly includes two aspects: one is Bessie concave south subsags hydrocarbon source rock condition and how resource potential;The second is the distribution pattern of sedimentary facies belt and favorable reservoir.Based on the above two reasons,this paper carried out the study on the main control factors of oil and gas accumulation in the south tuen formation in Bessie area.Combined with the drilling situation of study area,with conditions of source rock and reservoir describe as the key point,with high precision 3 d seismic inversion technique and sedimentary facies prediction technology as the means,through the oil source rock characteristics,plane distribution of sedimentary facies,reservoir prediction,etc.Through a variety of geological conditions of the composite,systematic and comprehensive research in Bessie tuen set of main controlling factors of hydrocarbon accumulation in the south,points out that the conditions of source rock,sedimentary environment,the central fault zone,micro structure amplitude is Bessie region south tuen group control factors of hydrocarbon accumulation and distribution.There are three main types of crude oil in the research area.The main source of oil is from the north trough of the main oil trough in Bess sag,and the central fault zone is the main channel for its hydrocarbon migration.According to the result of oil source correlation,and kernel oil field of crude oil and Steve souders structure with the main body of crude oil has good comparability,that call and the kernel oil field of crude oil mainly comes from the bay northwest main grooves,by faulting extraction,and gathered into hiding.Bei 39 drilling Wells proved that Bessie concave south subsags ability of hydrocarbon generation,the south a as the main hydrocarbon source rocks,organic types for ? 2-? type 1.There is a close relationship between the distribution of sedimentary facies belt and tectonic evolution.During the sedimentary period of the southern period,the tectonic activity in the western part of the study area was strong and the source supply was sufficient,and the spatial distribution of the reservoir in the study area was controlled by the three main sources.In comprehensive research on the basis of above,favorable zones for Bessie region south tuen group was evaluated,pointed out that although Mr Southwest of the reservoirs are mainly concentrated in the highstand system tract and low system domain,in the south section of highstand system tract and low system domain are reservoirs have been discovered and the south a only discovered reservoirs in the high system domain,and has yet to gain breakthrough in prospecting in the low post system in the domain.According to the control of sand body,the south section of low development is no doubt,sand body and copper bowl temple at the top of the group of regional unconformity surface,can be a favorable oil and gas migration channel,with the objective conditions of forming reservoirs,and the south section of lowstand system tract reservoir exploration is the key point of next exploration.