川东北长兴组生物礁的三维地震响应特征  

CHARACTERISTICS OF 3D SEISMIC RESPONSE OF BIOHERM OF CHANGXING FORMATION IN THE NORTHEAST OF SICHUAN

作　　者：王小品[1] 熊晓军[2] 贺振华[1] 

机构地区：[1]成都理工大学油气藏地质与开发工程国家重点实验室,四川成都610059 [2]成都理工大学地球探测与信息技术教育部重点实验室,四川成都610059

出　　处：《大庆石油地质与开发》2011年第2期167-169,共3页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目（40904035）资助.

摘　　要：为了正确识别生物礁的地震反射特征，采用块状结构模型进行三维地质建模，并将二维波动方程推广到三维波动方程。与此同时，对川东北生物礁的典型特征进行了数值模拟，有效地验证了生物礁的各种典型特征的正确性。首先，在二维波动方程基础上扩展到三维波动方程，将二维封闭结构模型扩展到三维封闭结构模型；然后，对实际生物礁进行了三维建模及三维数值模拟，使得实际生物礁的模拟记录中仅包含地震波的绕射波和反射波特征（干扰波少），有利于深刻认识生物礁的地震反射特征。For identifying the seismic reflectance signatures of bioherm exactly, a block-structure model is used to establish 3D geological model, and 2D wave equation is extended to 3D wave equation. At the same time, the typi- cal characteristics of bioherm in the northwest of Sichuan are numerically stimulated, which validates the correct- ness of every characteristics of bioherm. First of all, based on the 2D wave equation, 3D wave equation is extended, and 2D closing structural model extended to 3D one. And then, 3D model building and numerical simulation are done for the actual bioherm, let the stimulated seismic records of actual bioherm only include the diffracted wave and reflected wave features （ little disturbing wave） , which is in favor of recognizing the seismic reflectance signatures of bioherm.

关 键 词：生物礁 数值模拟 三维波动方程 块状结构 分步傅立叶变换 

分 类 号：P631[天文地球—地质矿产勘探]