深层碳酸盐岩岩溶风化壳洞缝型油气藏可检测性的理论研究  

Theoretical study of detectable cavern-fractured reservoir in weathered Karst of deep carbonatite.

作　　者：姚姚[1] 唐文榜[2] 

机构地区：[1]中国地质大学地球物理系 [2]中国石油化工集团公司勘探开发研究院

出　　处：《石油地球物理勘探》2003年第6期623-629,共7页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目(40174034;40274038);中国石油天然气集团公司物探重点实验室开放基金项目(GPKL0207)资助。

摘　　要：本文使用随机介质模型及非均质弹性波波动方程进行了系统的正演模拟和大量的理论分析。正演模拟的结果为溶洞可检测性的研究和充填流体溶洞的地震响应特征的研究提供了翔实的依据。研究表明,用常规频带(主频为20～40Hz)地震数据可以探测高度为2～15m的充填流体的溶洞,并描述溶洞空间分布,圈定其边界,估算其高度。在常规地震频带(20～40Hz)条件下,当溶洞高度在2～15m范围内变化时,其绕射波垂直分量的振幅受洞高变化的影响较小,而水平分量则几乎不受洞高变化的影响。基于随机介质模型理论和非均质弹性波波动方程的正演模拟技术,本文实现了10°m级的超小型任意形状溶洞的正演模拟,为类似溶洞的不规则、非均匀、超小型地质体的正演模拟提供了一种可靠的方法。The paper used the random medium model and non-homogeneous elastic ecjuation to carry out systematic forward modeling and a lot of theoreti-cal analysis. The results of forward modeling pro-vided a solid basis for study of detectability of caves and study of characteristic seismic response to fluid-filling caves. The study showed that using the seismic data with ordinary frequency band (dominant frequency is 20-40Hz) can detect the caves having 2 - 15m in height of fluid-filling caves ,determine its spatial distribution and bound-ary and evaluate its height. Under the condition of ordinary band (20-40Hz ) and that the height of caves changes within the scope of 2 - 15m, the height of caves has a little influence on the ampli-tude of vertical component of diffraction and hardly on its horizontal component. The forward modeling technique using the random medium modei and non-homogeneous elastic equation can do forward modeling of super miniature (10°m grade ) caves having any forms,which provides a reliable method for forward modeling of non-regular, heteroge-neous and super miniature geologic body that is similar to the caves.

关 键 词：碳酸盐岩 洞缝型油气藏 随机介质模型 可检测性 正演模拟 

分 类 号：P618.13[天文地球—矿床学]