对地震沉积学理论创新的认识

Discussion on theoretical innovation of seismic sedimentology

地震沉积学自创建以来,关于其理论基础和理论创新方面的讨论较少。文中在分析前人研究成果的基础上,结合勘探实践,认为作为一门利用地震资料研究沉积岩及其形成过程的新兴边缘学科,地震沉积学以现代沉积学和地球物理学的基本原理为指导,其理论创新主要体现在:①地震数据体揭示沉积体的平面几何形态比垂向形态更加容易;②地震反射同相轴具有穿时性,地震数据的频率控制了同相轴的倾角和内部反射结构。同时认为这2点是地震沉积学核心思想(发掘地震数据体中等时沉积界面上的地震地貌信息来研究沉积相、沉积结构和沉积演化)的重要依据。

Based on the previous research, combined with exploration practice, it is considered that as a new frontier interdiscipline subject which uses seismic data to study sedimentary rock and its forming process, seismic sedimentology has its unique theoretic basis based on the theories of the modern sedimentology and the geophysics. Its theoretical innovation mainly displays in the following two aspects： ①a depositional body is easier to be resolved with seismic data in horizontal dimension than in vertical; ②primary seismic reflection events do not necessarily follow the geologicaltime surfaces, the seismic frequency content of the data controls the dip and inner reflection configuration of seismic events. These two principles are the basis for using horizontal seismic attributes （seismic geomorphology） to study the sedimentary facies and their evolution,which are the core ideas of the seismic sedimentology.