陈泓竹
CHEN Hongzhu

• 1:中国地质大学(北京)地球物理与信息技术学院

摘要(Abstract)：

海拉尔盆地呼和湖断陷垂向发育3套煤系地层,产生的多次波导致地震波场结构复杂,客观认识多次波特征是地震高保真处理的前提。依据地质和测井资料及地震剖面建立正演模型,由波动方程有限差分法模拟生产地震单炮记录,经保真处理得到动校正后CDP道集、速度谱、叠加剖面。分析正演结果与实际地震数据,认为该区地震多次波为层间多次波,其数量多、能量强、周期不一致。短周期多次波与反射波叠加,改变了反射波振幅,且多次波与反射波的时差小,不易被压制,是影响南二段目的层勘探的原因。
Three sets of the coal-measure formation are vertically developed in Huhehu Fault Depression,the caused multiple results in the complicacy of the seismic wave field structure,so objectively regarding the multiple characteristics is an the prerequisite for the high-fidelity seismic data processing. In the light of the geological and logging data and moreover the seismic profile,the forward model was built,the single shot record was modeled by solving the wave-equation finite difference algorithm,the high-fidelity data processing was exploited to produce NMO-ed CDP gather,velocity spectrum and stacked section. The analysis between the forward modeling results and the real seismic data reveals that the multiples in this area belong to the inter-formational ones which are characterized by the large number,strong energy and different cycles. The stack between the short-cycle multiples and reflecting wave changes the amplitudes of the latter,and furthermore the NMO between the two kinds of the waves stated above is not big enough to suppress easily,they become the reasons of influencing the exploration of Member Nan-2 target layer.

关键词(KeyWords)： 呼和湖断陷;煤系地层;数值模拟;层间多次波;波阻抗界面;动校时差
Huhehu Fault Depression;coal-bearing formation;numerical simulation/modeling;inter-formation/layer multiple;wave impedance interface;removed moveout

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(2016ZX05003-003);; 中国石油天然气股份有限公司重大科技专项“海拉尔—塔木察格盆地综合地质研究及勘探配套技术”(2011E-1202)联合资助

作者(Author): 陈泓竹
CHEN Hongzhu

DOI: 10.19597/j.issn.1000-3754.201708041

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