| Based on the systematic study of petroleum geological condition, such as source-reservoir-cap assemblage and reservoir-forming pattern in Turpan-Hami Basin, it is considered that the source rocks are mainly coal-bearing source rocks of Jurassic Xishanyao Formation and Badaowan Formation, and lacustrine source rocks of Permian Taodonggou Group. These two sets of source rocks with high hydrocarbon-generating intensity are located in the main subsidence area of Taipei Sag, and have the source conditions for forming large-scale oil field. Of the three sets of reservoirs, Jurassic reservoirs are mainly coarse sandstone of braided river delta distributary channel, the reservoirs of Permian Wutonggou Formation and Triassic Karamay Formation are mainly sandstone and conglomerate of the subaqueous distributary channels in the fan delta and braided river delta front. According to main factors controlling hydrocarbon accumulation, four types of accumulation patterns are classified in Jurassic: forward differentiation, reverse differentiation, vertical differentiation and mixed pattern. The Permian hydrocarbons accumulate in pattern of lateral long-distance and trapping in paleoslope. The Triassic hydrocarbons accumulate in pattern of vertical migration and self-generation and self-storaging in source rocks. By using analogy, statistics, genesis and Delphi weighting method, it is calculated out that the amounts of conventional petroleum resources and the remaining resources are 10.09×108 t and 6.07×108 t, respectively. Through evaluating geological conditions, predicting remaining resource distribution, three exploration directions and favorable target areas of Shanshan arc play, Lukeqin-honglian play and western arc play are proposed. |
