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侏罗系蓬莱镇组气藏是白马庙复式气田的主力气藏。笔者采用白垩系天马山组和侏罗系蓬莱镇组残厚分布的方法识别出，白马庙构造在燕山晚幕已隆升具雏形，喜山晚幕褶皱定型。由储层中残烃与胶结物的世代关系，按成岩相序列划分和埋深计算，油气的侵入应在燕山晚幕构造期。燕山晚幕的隆升，为油气聚集成藏提供了良好的输导条件和储集场所，下伏的须家河组烃源岩已进入成烃高峰期，油所在压差作用下循断裂裂缝上移；此时，蓬莱镇组埋藏尚浅，压实和胶结作用弱，存在较高的原生孔隙空间，油气的适时侵入，改变了成岩环境，对富长石砂岩进行溶蚀，使孔隙空间得以保存和发展。进入喜山构造期，构造褶皱幅度加大，油气不断充实储层，形成受构造、岩性双重制约的构造－岩性气藏。

Study on Gas Pool Formation of Penglaizhen Formation in Baimamiao Gas Field ofWest Sichuan Sag

As a main pool of Baimamiao Gas Field, it is thought that Jurassic Penglaizhen Group, based on the residual thickness distribution of Cretaceous Tianmashan Group, and Jurassic Penglaizhen Group, started to uplift in the late Yanshan tectonic episode and fold in the late Himalayan tectonic episode. According to the generation of residual hydrocarbon and cements in the reservoir bed, the invasion of oil and gas might bring about in the late Yanshan tectonic episode on a basis of division of diagenetic sequences and calculation of buried depth. Uplift in the late Yanshan tectonic episode provided good migrate condition and storage area for oil and gas accumulation. The source rocks of underlying Xujiahe Group might enter into the peak of gas-generation. The hydrocarbon migrate up under the differencial stress. Thanks to shallow bury of Penglaizhen Groupand weak compression and cementation, large primary porosity existed. Invasion of hydrocarbon changed diagenesis circumstances, and corrode the sandstone rich of feldspar, which led to exist and develop porosity. During Himalayan tectonic episode, the increasing structure fold amplitude stimulated hydrocarbon to fill out the reservoir, and the lithologic gas pool controlled by structure and lithology formed at last.