火成岩速度—深度模型建立方法研究  

Igneous rock velocity-depth model building

作　　者：张涛[1] 王小卫[1] 田彦灿[1] 鲁烈琴[1] 刘伟明[1] 雍运动[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《石油地球物理勘探》2015年第3期431-435,2,共5页Oil Geophysical Prospecting

摘　　要：根据火成岩的特殊地质特征,利用VSP等先验信息准确提取地震成像速度的低频分量,再利用三维网格层析技术对速度—深度模型进行全局优化,从而得到地震成像速度的高频分量,减弱了速度求解中多解性问题的影响,使其更为精确描述火成岩体。实际资料处理结果表明,该方法不仅使火成岩下伏地层形态得到很好恢复,而且也使火成岩得到精确成像。对于复杂地区地震成像具有一定的借鉴意义。A method for igneous rock velocity-depth model building is put forward in this paper.According to the special geological features of igneous rocks,we extract accurately the low frequency component of seismic imaging velocity from VSP and other priori information.Then we optimize velocity-depth model with three-dimensional grid tomography to obtain the high-frequency component of seismic imaging velocity.This method reduces the influence of multiple solutions in the process of velocity inversion,and then igneous rocks can be more accurately imaged.Application results on real data show that the proposed method can well image not only igneous rocks but also overlying strata under igneous rocks.

关 键 词：火成岩 先验信息 网格层析 构造恢复 

分 类 号：P631[天文地球—地质矿产勘探]