Bell Depression In Budate Group Buried Hill Oil And Gas Accumulation Mechanism And Key Controlling Factors

Based on amount of datum of oil geology , geochemistry and geophysics , this paper researches on accumulation of oil deposit of Budate group in Beier depression combining with analysis and reseaching .Through analyzing geochemical indexes , including organic carbon , chloroform extract"A", and carbon isotope etcal. .It can be concluded that the main sources of oil and the quality of sourcerocks is Nantun group , its'conditions of providing oil is best , the next is Xinganling group , the least is Budate group . Through analyzing of cores and judging undering microscope, it found that the main reservoirs spaces are fissures , the second is rock hole . the developing regulation of fissures and holes can be found , their width and indensity have some relations with macrofractures , and fissures are effected by lithology , fractures , palaeo-geomorphology and other factors . The best region for reservoir locates at northwest of Bei 5 Huhenuoren structural belt , region between Huoduomoer and Sudeerte structural belt ,the north small region of Bei 40 well and the west region of Bei301 . The middle region locates ai Sudeerte buried hill structural belt , party are at Huoduomoer anticline structural belt Huo 3 well and the north of Haican 2 well . The least are at the south region of Beixi billabong and Aonaohai billabong , the most part of Huoduomoer anticline structural belt . It got the best caprock locates at the scatter region , such as little region of middle Huhunuoren and Aonaohai billabong , long and narrow region of Huoduomoer anticline structural belt , Sudeerte fracture belt's southwest and middle region . The west of Aonaohai and the mai parts of Bulehongbusi and Xileaobao are the middle level , the bad region locates at east of Beier depression north of Huhubuoren and the west region and Mudstone of Xinganling group are at the group except those parts . Through analyzing homogeneous tempreture about fluid inclusion enclave , with heat history and embedding history , this paper claim that there are two main period which oil accumulate to buried hill , one is the end of Yimin group , another is end of Damoguaihe group . It conclude the main pathways are fractures in top of burried hill and fractures. According to that , there are two main model of accumulating reservoirs , one is oil accumulating to the unconformity surface on th top of buride hill through fractures and combination of unconformity ,the other is accumulating through fissures and crushed zone inside laterally Combining with all factors , there are two models can be structured , that is side migrating to weathering crust of buried hill , vertical migrating to inside fractures and migrating through surfaces created by fractures . Above all , it can be found that , analyzing comprehensively , oil reservoirs in top of weathering crust and inside fractures are two main types and region near or the mid of sourcerock , and region of sourcerock or nearby , affluently developed fractures which didn't destroy caprocks , area witch are full of fissures , accumulating ereas and buried hill of fault block and sag formed in the middle stage are main controlling factors to form oil reservoirs . Considering all factors , this paper got the main region for next exploring , with geological dynamic and static datum , oil reservoirs in weathering crust of buried hills mainly locates at center of Sudeerte structurcal belt and the north and middle region of Beixi billabong; those formed in fissures and crushed zone locates at south parts and the north of Beixi region , the mid and the north of Sudeerte structurcal belt , the center of Aonaohai billabong and the east of Surennuoer structurcal belt...