基于地震模拟数据分析的南黄海前新生代地震成像问题与对策探讨  

Methodological studies on imaging the pre-Cenozoic in the South Yellow Sea based on seismic numerical modeling data

作　　者：耿建华[1,2] 朱伟林[1,2] 高顺莉 张敏强 GENG Jianhua1,2 , ZHU Weilin1,2, GAO Shunli3 , ZHANG Minqiang3(1. Tongji University, State Key Laboratory of Marine Geology, Shanghai 200092, China; 2. Research Center for Marine Resources, Tongji University, Shanghai 200092, China; 3. Shanghai Branch of CNOOC Ltd., Shanghai 200030, Chin)

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092 [2]同济大学海洋资源研究中心,上海200092 [3]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《海洋地质与第四纪地质》2018年第3期35-44,共10页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目"南黄海中;古生界复杂地质构造地震成像理论与方法"(41630964);"压制鬼波的理论方法与应用研究"(41174106)

摘　　要：分析了南黄海前新生代地震勘探地质条件,认为该区地下地震反射界面速度反差可高达1.5~3.0倍。在建立了南黄海前新生代地震勘探1D和2D地震波传播模型的基础上,通过对模拟采集数据进行分析,提出了该区前新生代地震成像的主要问题。通过对模拟采集数据进行成像处理发现,通常的叠加方法在一定程度上能够压制多次波,但前新生代地层反射波不能成像;在不考虑速度模型建立的情况下,在压制鬼波、SRME+高精度拉动变换压制自由表面多次波后,Kirchhoff积分叠前深度偏移方法能够使前新生代复杂地质构造基本成像,而叠前逆时深度偏移方法能够使前新生代复杂地质构造精确成像。The analysis of pre-Cenozoic seismic geological settings in the South Yellow Sea suggests that the ratio of seismic velocity contrast of subsurface reflectors reaches as high as 1.5 to 3.0.In the case,1D and 2D seismic wave velocity models are established with logging and seismic data.After analyzing the modelling data,we found the main problems of imaging preCenozoic deposits in the South Yellow Sea.By processing the modelling data,it is realized that although the conventional stack can attenuate multiples but pre-Cenozoic reflections cannot be imaged.If we did not consider velocity model building,after deghosting and attenuating free surface-related and interbedded multiples by SRME and high resolution Radon transform,Kirchhoff integral prestack depth migration can essentially make pre-Cenozoic complex geological structures well imaged,and prestack reverse-time depth migration method can precisely image the complex pre-Cenozoic geological structures.The studies have provided an important guidance for seismic exploring pre-Cenozoic complex structures in the South Yellow Sea.

关 键 词：前新生代 模拟采集 多次波 地震成像 南黄海 

分 类 号：P738[天文地球—海洋地质]