冀中饶阳凹陷大王庄地区古近系沉积演化特征与储盖组合分析

Sedimentary Evolution and Reservoir-Cap Rock Assemblages of Palaeogeue in Dawangzhang Area,Raoyang Sag,Central Hebei Province

冀中饶阳凹陷大王庄地区古近系属断陷湖盆演化阶段,分为断陷分割期、断陷扩张期和断陷萎缩期3个时期,发育辫状河三角洲、滨浅湖和曲流河3类沉积体系。在等时地层格架内,分析了该地区沉积演化特征和储盖组合的分布及时空展布规律,指出该区古近系主要发育沙三段、沙二段、沙一段和东营组4套储盖组合,其中沙一段储盖组合为最有利的含油储盖组合。

Dawangzhuang area undergo two evolution phases of structure-deposit： rifting and post-rifting in Raoyang sag, Central Hebei province. The rifting phase is divided into three stages： there are the rift segmentation stage, the rift spreading stage and the rift depression vanishing stage. There are three types depositional systems are identified, namely shallow lake-braided river, delta shallow lake and river depositional systems. Within the correlation framework of the sag, the relationship of the base level circle and the reservoir-cap rock assemblages＇ development and distributing characters are analyzed. Four series reservoir-cap rock assemblages are developed in the study area, there are the third segment of Shahejie formation, the second segment of Shahejie formation, the first segment of Shahejie formation and Dongying formation. The third reservoir-cap rock assemblage is favourable.