STUDIES ON THE OIL ＆ GAS RESERVOIR FORMATION CONDITIONS AND EXPLORATION BEARING IN DABAN TOWN SUB-DEPRESSION OF CHAIWOPU DEPRESSION
柴窝堡凹陷达坂城次凹油气成藏条件及勘探方向

The conditions of reservoir formation are studied, Oil & gas exploration potential are analysed, and the best prospecting plays are evaluated in Daban town sub-depression of Chaiwopu depression under the techniques of effective source rock theory, reservoir evaluation and reformed basin modeling. It is demonstrated that the main source rock in Daban town sub\|depression is Upper Permian which belongs to good to intermediate source rock, and has definite resources potential; the main reservoir is also Upper Permian with rather poor petrophysical properties, which,in Daban town sub-depression, is a good gas-bearing reservoir as a whole and the main exploration target for hydrocarbon; there are four types of hydrocarbon reservoirs including structural reservoir, stratigraphic reservoir, lithologic reservoir, and complex reservoir, and two patterns of reservoir formation, i.e., self source-lateral expulsion of hydrocarbon, and external source-vertical expulsion of hydrocarbon; the best plays are Chaiyang fault-fold belt and Sangeshan thrust-fault belt.