基准面变化在地震层序地层研究中的应用

Application of sedimentary base level in the study of seismic sequence stratigraphy

通过基准面在层序地层发育过程中的变化分析 ,建立了层序地层、基准面旋回和储层砂体叠加方式的对应关系。在此基础上以苏北某凹陷盆地为例 ,通过基准面旋回分析并结合高分辨率测井层序地层研究 ,识别地震层序地层及其反射特征 ,同时以地震地层超覆特征及基准面旋回性对应关系 ,预测了目标层序储层砂体纵横向分布特点 。

A relationship among sequence, base level cycles and the overriding style of reservoir sand is established through an analysis of the change of base level during the formation of seismic sequence. Base on an analysis of base level cycles and the study of zonation on high resolution well logging data, the seismic sequences and their reflection configurations were identified on the data from a depressed basin in the north of Jiangsu Province. The distributions of the target reservoir sand in vertical and horizontal directions were inferred by the relationship among seismic sequences, overlap, and base level cycles. A method, which bases on analysis of base level cycles and seismic sequence stratigraphy and used for prediction of reservoir sands, is presented in the paper.