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以致密气藏为代表的非常规油气藏勘探在国内逐渐得到重视.前梨园洼陷是东濮凹陷最大的生油气洼陷,展示了极好的深层超压天然气勘探前景.在实测压力基础上,结合声波时差及地震速度计算,利用东濮凹陷丰富的测井、测试和地质资料综合分析超压分布和成因.结果表明:前梨园地区地层压力在纵向上具有典型双层结构,其中沙三中下亚段超压普遍发育.泥岩层的压力分布与砂岩储层的压力分布特征具有一定差异,泥岩欠压实所产生的增压并不显著,生烃作用尤其是大量生气为区域超压形成的主要机制.超压的存在对天然气运聚成藏产生重要的影响.超压通过对成岩作用的影响,改善了深部砂岩储层物性从而提高储集性能.相同深度和储集条件下,油气层压力越高,相应含油气饱和度增高.加强超压相关研究对于本区深层致密砂岩气藏勘探意义重大.
The unconventional oil and gas reservoirs, represented by dense gas reservoirs, are gradually being valued domestically in China.The former Liyuan sag is the largest oil and gas sag in the Dongpu sag, showing an excellent prospect of deep overpressure natural gas exploration.Based on the measured pressure Based on the well logging, testing and geological data of Dongpu Depression, the overpressure distribution and genesis are analyzed synthetically.The results show that the formation pressure in Qianliyuan area has a typical double-layer structure in the vertical direction, The overpressure in the middle and lower subduction regions is generally developed.The pressure distribution in mudstone layer is different from the pressure distribution in sandstone reservoirs, and the supercharging pressure caused by under-compaction of mudstone is not significant, and the hydrocarbon generation, The main mechanism of formation.The existence of overpressure has an important impact on the migration and accumulation of natural gas.The overpressure can improve the reservoir properties by improving the physical properties of deep sandstone reservoirs through the influence of diagenesis.Under the same depth and storage conditions, The higher the pressure of the oil-gas layer, the higher the corresponding oil-gas saturation.The enhancement of overpressure related research is of great significance to the deep-seated tight sandstone gas reservoir exploration in this area.