准噶尔盆地东缘J扇三角洲沉积特征研究

Fan Delta Sedimentary Characteristics of of the Lower Jurassic Badaowan Formation in the Eastern Margin of the Junggar Basin

许磊 王宗俊 王盘根 商志垒 郭晓

XU Lei WANG Zongjun WANG Pangen SHANG Zhilei GUO Xiao

中海油研究总院有限责任公司, 北京 朝阳 100028

CNOOC Research Institute Co. Ltd., Chaoyang, Beijing 100028, China

发育于准噶尔盆地东缘滴水泉地区的下侏罗统八道湾组一段（J）是一套新发现的油气储集层，细化该层段的储层沉积研究对于认识该区域有利储层展布特征和储量潜力评估有着重要意义。以滴南凸起东部滴20井区为研究对象，从精细岩芯描述入手，综合测井及露头测量资料，提出了"标志层约束，微相为基础，近距自旋回，远距定量库"原则，完成了成因砂体的空间对比，探讨了滴南凸起东部扇三角洲的沉积特征和沉积模式。结果表明，该区下侏罗统八道湾组一段砂砾岩储集层为典型的由山间水流入湖形成的扇三角洲沉积，且具有"小平原，大前缘"的特征；微相类型可细分为水下分流河道、辫流坝、水下分流间湾、前缘席状砂、前三角洲泥等；滴水泉地区八道湾组一段储层属于卡拉麥里山前沉积，物源供给充沛，多形成近源的扇三角洲沉积，扇体形态则主要受控于古地貌特征和物源供给量。

The Member 1 of the Lower Jurassic Badaowan Formation (J) in the Dishuiquan region at the eastern margin of the Junggar Basin is a newly discovered oil and gas reservoir. In-depth reservoir sedimentation research on this member is important for understanding the favorable conditions for reservoir formation in the region and evaluating the potential reserves. The Di20 site in the eastern Dinan uplift was studied in this project. A detailed core description was integrated with well logging and outcrop measurements to propose the following principle:" Constrained by the marker beds and based on the microfacies, spin echo and reserve determination are conducted at local and region scales, respectively." Spatial comparison of constituent sand bodies was thereby performed to investigate the sedimentation characteristics and modes of the fan delta in the eastern Dinan uplift. The results demonstrate that the sandstone-conglomerate J reservoir in the region is a typical fan delta deposit formed as water from mountains entered lakes. It is characterized by small plains and large fronts. The microfacies can be further divided into underwater distributary channels, braided bars, underwater distributary bays, delta-front sheet sand, delta-fronts sand, and other facies. The J reservoir in the Dishuiquan region is the piedmont deposit of the Kalamaili Mountain with abundant source materials. Near-source delta-fan deposits often result when the fan shapes are mainly controlled by paleo-geomorphological characteristics and the supply of source materials.

10.11885/j.issn.1674-5086.2017.05.18.03