地震沉积学在陆相湖盆沉积体系研究中的应用——以江陵凹陷上白垩统渔洋组为例

Application of Seismic Sedimentology in the Study of Continental Lake Basin——By Taking Yuyang Formation in Upper Cretaceous of Jiangling Depression for Example

地震沉积学是利用地震资料研究沉积岩及其形成过程的一门新兴学科,是进行沉积体系研究及储层预测的有效技术。从单井岩心、测录井及露头资料出发,利用地震反射构型、地层切片及多种地震属性分析技术,结合不同沉积体系单元的地貌形态,在江陵凹陷三维地震资料覆盖区的上白垩统渔洋组(K2y)展开了地震沉积学应用研究。根据江陵凹陷的区域地质背景,以岩心及测录井地质模型与地震反射构型、地层切片、多种地震属性互动反馈为基本思路进行研究,认为研究区主要发育河流、三角洲和湖相沉积;通过一系列典型地层切片及地震属性分析,刻画了江陵凹陷K2y不同沉积时期各沉积体系的分布。研究显示地震沉积学在陆相湖盆沉积体系分析及岩性预测方面具有独特的优势。

Seismic sedimentology was a new subject for studying the sedimentary rocks and their forming process using seismic data. It was an effective technology for the research of depositional systems and reservoir prediction. On the basis of cores,logging data and field outcrops,by using seismic reflection configurations,strata slice and seismic attribute analysis technologies,combined with morphologic shapes of different depositional systems,seismic sedimentological studies were carried out in Upper Cretaceous Yuyang Formation( K2y) of Jiangling Sag. Studies were performed by using the regional geologic background in Jiangling Depression and using cores and geologic log model,seismic reflection configuration,geologic slice and interaction and feedback of seismic attributes as basic thought,it was considered that fluvial,delta and lacustrine sedimentary systems were developed in the studied area. Through the analyses of typical strata slice and seismic attributes,the distributions of sedimentary systems in different times were depicted in Yuyang Formation of Jiangling Depression. Study shows that the seismic sedimentology has its unique advantages in sedimentary system analysis and prediction of lithology.