断陷盆地油气藏保存条件综合评价

我国东部中新生代含油气盆地大部分为断陷盆地，对断陷盆地的油气藏保存条件进行综合研究具有重要意义。以盆地构造演化史研究为基础，对成藏期以后断裂的封闭史、构造抬升剥蚀、岩浆活动、地下水活动、盖层封闭和控油断层封闭进行了定性和定量分析，总结了断陷盆地油气藏保存条件的研究内容和以模糊评判为主的评价方法。将该方法应用于阜新盆地油气藏保存条件的研究，取得了很好的效果。

EVALUATION OF PRESERVATION CONDITIONS OF OIL-GAS RESERVOIR IN RIFT BASIN

There are numbers of rift subsidence basins during Mesozoic Cenozoic in eastern China. Rifting was very strong in these basins.Many oil gas reservoirs were distroyed by the rifting after the accumulation of oil and gas. It is very important to sdudy preservation conditions of oil reservoir for oil gas exploration in these rift subsidence basins. The preservation conditions of oil gas reservoir about rift subsidence basins include tectonic evolution of basin, sealing history of faults after the accumulation of oil and gas, tectonic uplift and denudation, magmatic activity,dynamics of ground water, seal of cap rocks, and seal of the major faults, etc. Combination method of fuzzy mathematics and expert intellectures used to evaluate preservation conditions for oil gas reservoirs is presented. This method is applied in Fuxin basin, and a good result is achieved.