The Study On Petroleum Accumulation And Explorating Direction Of Mesozoic In The Block 1, Center Of Junggar Basin

Synthetically studying petroleum accumulation and controlling factors, showing favourablly explorating direction on linking Mesozoic Reservoirs with evolution of Chepaizi-Mosuowan paleo-uplift, relict, sedimentary system, contact system and reservoirs stage.The evolution of Chepaizi-Mosuowan pale-uplift can be divided into four stages, i.e. initial formation stage, uplift erosion stage, steadily subsiding stage as well as tilting vanishing stage, which disappeared in late Tertiary Period, which is characteristic on high migration, oscillating uplift and differential erosion. Distribution of Mesozoic, particularly middle Jurassic relict is controlled by evolution of pale-uplift. The member 2 of Sangonghe formation is deposited in delta, where mild slope braider stream delta is deposited in the east, and fan delta in the west.Xishanyao formation is deposited in delta and limnetic facies. Toutunhe and qingshuihe formation is deposited in fluvial fancies. Main petroleum accumulation model of Mesozoic reservoirs can be summarized as"multiple injection by deep hydrocarbon source, netshaped migration, early structural trap-reservoirs and late diversity adjust and lithological trap-reservoirs. Chepaizi-Mosuowan pale-uplift has provided with the conditions to form the various subtle traps such as lithologic and stratigraphic traps, controlled petroleum accumulation and adjust. Multi-origin delta and fluvial depositional system distributed reservoirs. Fault and unconformity settled good settings for hydrocarbon migration which are favorable to generate the regional hydrocarbon reservoirs inside the block 1. Structural uplift is the dominant direction of hydrocarbon migration in reservoirs period. South of Sha 1, Southwest- of Zhen 1,and Zhenshacun~Moxizhuang is the favorably explorating direction.