黄骅坳陷板桥凹陷古近系沙一段中部层序地层学研究与岩性油气藏勘探

黄骅坳陷板桥凹陷含油气储层主要为深湖相泥岩之中的湖底扇砂体。由于湖底扇沉积属突发性洪水事件成因,湖底扇砂体的分布较为复杂,预测湖底扇砂体的难度较大。通过湖底扇沉积特征研究,提出板桥凹陷湖底扇砂体为扇三角洲前缘重力流滑塌成因。湖底扇砂体在垂直于重力流方向上呈透镜状分布;而在平行于重力流方向上,湖底扇砂体则表现为叠瓦状展布。依据湖底扇砂体的井-震响应特征,运用地震相分析以及地震属性提取等手段,预测了湖底扇砂体的分布,发现湖底扇沉积具有优先充填古地貌低势区的规律,提出了岩性油气藏勘探的有利目标。

Study of sequence stratigraphy and exploration of lithologic reservoirs in the Paleogene Middle Sha-1 Member, the Banqiao Sag of the Huanghua Depression

The sublacustrine fan sandbodies developed in the deep lacustrine mudstones are the most favorable reservoirs and the main target of the lithologic reservoir exploration in Banqiao sag.The distribution of the sublacustrine fan sandbodies is so subtle and complicated due to their nature of sudden flood events that it's difficult to predict.Based on the sedimentary study on the sublacustrine fan,the author suggests that the sublacustrine fan sandbodies slump deposits of gravity flow on a fan delta front.The sublacustrine fan sandbodies occur in lenticularity vertical to the direction of the gravity flow and in imbricate arrangement parallel to the direction of the gravity flow.According to the responses of sublacustrine fan,the author predicted the distribution of the sublacustrine through seismic facies analysis and seismic attributes Abstraction,revealed that the distribution of the sublacustrine fan was controlled by the geomorphologic low and pointed out the favorable targets for lithologic reservoir exploration in Banqiao sag.