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东濮凹陷杜桥白地区 (包括杜寨、桥口和白庙 3个构造单元 )位于前梨园和葛岗集两大生烃洼陷之间 ,它们的下第三系暗色泥岩厚度分别达到 1 1 0 0 m和 1 50 0 m,其有机质类型好 ,热成熟度高 ,与下伏石炭二叠系煤系地层一起为该区提供了丰富的气源。该区天然气储层以长石石英粉砂岩为主 ,由于埋藏深 ,物性总体较差 ,属低渗致密砂岩储层。根据该区构造演化史、沉积史及生烃史的研究结果 ,结合该区深层流体分布特征 ,将该区深层气成藏模式归纳为晚期高压岩性气藏成藏模式和早期油气成藏模式。
The Duqiao area (including three structural units: Duzhai, Qiaokou and Baimiao) in the Dongpu Depression is located between two major hydrocarbon-generating depressions in Qianliyuan and Gegangji, and the thicknesses of their Lower Tertiary dark mudstone are respectively 1 1 0 0 m and 1 50 0 m with good organic type and high thermal maturity, which together with the underlying Permo-Carboniferous coal measures provide a rich source of gas for this area. The natural gas reservoir in this area is mainly feldspar-quartz sandstone, which belongs to low-permeability tight sandstone reservoirs due to its deep burial and poor overall properties. According to the research results of tectonic evolution history, sedimentary history and hydrocarbon generation history of the area, combined with the distribution characteristics of deep fluid in this area, the deep gas accumulation model in this area can be summarized as the later accumulation of high pressure lithologic gas reservoirs and the early hydrocarbon accumulation mode.