东濮凹陷杜桥白地区深层气成藏条件及成藏模式

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１１００ｍ和１５００ｍ，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

Deep Gas Pool-forming Conditions and Models in Duqiaobai Area of Dongpu Depression

Duqiaobai area of Dongpu depression,including 3 structural units of Duzhai, Qiaokou and Baimiao,situates between two big hydrocarbon generating sag of Qianliyuan and Gegangji. The thickness of dark mudstone in Paleogene system is up to 1100 m and 1500 m respectively and organic matter is of good type and high maturity,and provides abundant gas source for the studying area in combination with underlying Permo Carboniferous coal bed in both Qianliyuan and Gegangji sags The gas reservoir rocks in the area consist dominatively of arkosic quartz siltstones, being lower permeability and porosity because of their deep burial depth and poor physical property According to the histories of tectonic evolution, sedimentation and hydrocarbon generation, the deep gas pool formation models are summarized as high pressure lithologic gas reservoir formed in late stage and oil and gas reservoir formed in early stage in combination with fluid distribution properties in deep layers