江汉盆地新沟嘴组下段滩坝砂沉积及分布特征

The Beach Bar Sand Deposit in the Lower Segment of Xingouzui Formation and Its Distribution Characteristics

江汉盆地是中国东部重要的含油盐湖盆地,具有丰富的油气资源。滩坝砂作为陆相湖盆重要的储集类型,是油气聚集的有利场所。通过岩心观察、薄片鉴定分析、单井沉积相分析、原型盆地恢复等多方法的综合研究认为,江汉盆地新沟嘴组下段滩坝砂按照古地貌关系可分为古缓坡沿岸滩坝、水下隆起周缘滩坝和三角洲侧缘滩坝共3种类型;在盆地物源体系控制下,江汉盆地滩坝砂体主要发育于盆地的中北部。

Jianghan Basin was an important oil-bearing saline lake basin in eastern China,which had rich oil and gas resources.Beach bar sand,as a crucial reservoir type of lacustrine basin,was a favorable place for oil and gas accumulation.Based on the comprehensive study of core observation,thin section identification,single well sedimentary facies analysis and prototype basin restoration,it was considered that beach bar sands in the lower segment of Xingouzui Formation in Jianghan Basin could be divided into three types according to palaeogeomorphological relationship,such as beach bar along palaeo-gentle slope,beach bar around underwater uplift and beach bar on delta side.Study shows that under the control of the provenance system of the basin,the beach bar sand bodies in Jianghan Basin are mainly developed in the north-central part of the basin.