惠民凹陷曲堤油田沙河街组沙三段物源分析及沉积相研究

为了查明惠民凹陷曲堤油田沙河街组沙三段沉积体系的分布格局,利用砂岩轻重矿物组合特征、阴极发光特征、地层倾角分析以及沙砾岩百分含量统计相结合的手段,对研究区物源方向、母岩类型及沉积微相进行研究。结果表明,研究区主体受到西南物源的影响,其母岩为鲁西隆起的片麻岩和花岗岩;沉积物从鲁西隆起向北西方向搬运入湖,形成扇三角洲沉积体系;曲堤地区主要发育扇三角洲前缘相沉积,可进一步识别出水下分流河道、分流间湾、河口坝、水下天然堤、决口扇及前缘席状砂沉积微相。

Source Analysis and Sedimentary Facies Research of Member Ⅲ of Shahejie Formation in Qudi Oil Field in Huimin Sag

For finding out the distribution pattern of the depositional system of MemberⅢof Shahejie Formation in Qudi Oil Field,and by using the combination characteristics of light and heavy minerals,the characteristics of cathode luminescence,the analysis of stratigraphic dip and glutenite percentage content calculation,this paper analyzes the source direction,mother-rock type and depositional microfacies in the study area.The results indicate that the study area is mainly affected by southwest sediment source,the mother-rock is the metamorphic rock and magmatic rock coming from West Shandong Uplift.The sediments were transported into lake from West Shandong Uplift to the northwest direction,forming fan-delta sedimentary system.The sedimentary facies in Qudi Oil Field has mainly developed as fan-delta front facies deposits which can be subdivided into underwater distributary channel,distributary interchannel,mouth bar,underwater natural levee,sub-aqueous crevasse splay and front sheet sand sedimentary microfacies.