东濮凹陷砂岩裂缝油藏特征及富集规律

Characteristics of fractured sandstone reservoir and its enrichment regularity in
Dongpu Depression

冯 英 胡晓辉 苑克红 陈 洁 王兴群

中原油田分公司勘探开发科学研究院，河南 濮阳 457001 中原油田普光分公司采气厂，四川 达州 636150

Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China Puguang Gas Production Plant, Zhongyuan Oilfield Company, SINOPEC, Dazhou 636150, China

通过对三叠系砂岩裂缝油藏地层特征、裂缝性储层特征研究分析，认为砂岩基质岩性致密，物性差，不具备储集性能。提出纯砂岩裂缝油藏的新论点为砂岩裂缝含油，明确了中生界三叠系砂岩裂缝特点及分布规律。在此基础上开展油气成藏控制因素及成藏模式研究，认为裂缝既是储集空间又是渗流通道，供烃条件决定油藏规模和富集程度，提高了对中生界高阻红层油藏的认识。

Based on the study and analysis of formation characteristics of fractured sandstone reservoir in Dongpu Depression, it is believed that the lithology of sandstone matrix is dense, with poor physical feature and having no reservoir properties. A new argument is put forward that when the oil is hold in the crack of sandstones, the reservoir is defined as net sandstone fractured reservoir. And the crack characteristics and distribution rules of Triassic sandstone in the Mesozoic has been determined. Based on this theory, controlling factors and models of hydrocarbon accumulation has been studied, which concludes that the cracks are both of reservoir space and seepage channel. Conditions of hydrocarbon supply decide the size and enrichment of the reservoirs. The understanding about Mesozoic red beds with high resistance has been improved.