Research On Oil And Gas Accumulation Mechanism And Models Of Budate Group In Beier Depression

Based on amount of datum of oil geology , geochemistry and geophysics , this paper researches onaccumulation of oil deposit of Budate group in Beier depression combining with analysis and reseaching .This paper carefully researched on the sources and quality of oil and capability of producing hydrocabornof sourcerock . 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 isNantun group , next is Xinganling group , the least is Budate group . Through analyzing of cores , thedeveloping regulation of fissures and holes can be found , their width and indensity have some relations withmacrofractures , the reservoirs of buried hill belong to low porosity and permeability and the secondary holesand dissures are the main body to accumulate oil and effected by lithology , fractures , palaeo-geomorphologyand other factors . The best locates at northwest of Bei 5 Huhenuoren structural belt , region betweenHuoduomoer and Sudeerte structural belt and the west region of Bei301 . With some well datum about rocks , itforms each group' s distribution map about mudstones , such as ratio of mudstone and layers , thickness and soon . The paper got the best cap rock locates at the little region of middle Huhunuoren and Sudeerte fracturebelt's southwest and middle region , the west of Aonaohai and the mai parts of Bulehongbusi and Xileaobao arethe middle level , the bad region locates at east of Beier depression north of Huhubuoren and the west region .Mudstone of Xinganling group are at the group except those parts . Through analyzing formers' datum aboutfluid inclusion enclave , adding more researching data , with heat history , this paper claim that there are twomain period which oil accumulate to buried hill , one is the end of Yimin group , another is end of Damoguaihegroup . From logging map , seismic inversion , interpreting well logging and profiles crossing Beixi belt ,Sudeerte structure belt and Aonaohai belt region , it conclude the main pathways are fractures in top of burriedhill and insides. Combining with all factors , there are three models can be structured , that is side migrating toweathering crust of buried hill , vertical migrating to inside fractures and migrating through surfaces created byfractures . Above all , it can be found that , analyzing comprehensively , oil reservoirs in top of weatheringcrust and inside fractures are two main types and region near or the mid of sourcerock , affluent developedfractures which didn't destroy caprocks , accumulating ereas are two better regions to form oil reservoirs .Considering all factors , this paper got the main region for next exploring , with geological dynamic and staticdatum , oil reservoirs in weathering crust of buried hills mainly locates at cnter of Sudeerte structurcal belt andthe northwest region;those forming in tractures locates at south parts and the north of Beixi region , the midand the borth of Sudeerte structurcal belt , center of Aonaohai and the east of Surennuoer structurcal belt...