| 提高浅层地震反射静校正精度的一种方法与数值模拟 |
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| 引用本文： | 张前,陈超,刘江平.提高浅层地震反射静校正精度的一种方法与数值模拟[J].地球物理学进展,2009,24(1):348-356. |
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| 作者姓名： | 张前 陈超 刘江平 |
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| 作者单位： | 中国地质大学地球物理与空间信息学院,湖北,武汉430074 |
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| 摘 要： | 浅层地震反射法是一种常用的勘探方法.在浅层地震资料处理中,静校正的精度直接影响速度反演的结果和叠加剖面的质量,在地形平缓时,固定基准面静校正可以满足勘探精度的要求,但在复杂地形条件下,其存在较大误差,即使采用浮动基准面,仍会由于地表一致性假设而残余静校正量,不能消除地形起伏引起的影响,为了提高浅层地震反射静校正的精度必须在常规静校正后进行一次剩余静校正,本文给出起伏地形条件下,滑动基准面(过共中心点的水平面即为该共中心点的滑动基准面)的剩余静校正量,该校正量与炮检距、反射层埋深、地层波速以及炮点和接收点高程有关,适用于单一介质和层状介质情况,本文通过对典型地形起伏的3个水平均匀层状介质理论地质模型的速度谱计算和分析,阐明在复杂地形条件下,应用本文提出的剩余静校正方法可以消除地形起伏的影响,提高静校正精度,在此基础上做动校正可以得到高质量的水平叠加剖面.
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| 关 键 词： | 复杂地形 剩余静校正量 浮动基准面 滑动基准面 |
| 收稿时间： | 2008-3-10 |
| 修稿时间： | 2008-6-20 |
A method of improving the shallow seismic reflection static correction and numerical simulation |
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| ZHANG Qian,CHEN Chao,LIU Jiang-ping.A method of improving the shallow seismic reflection static correction and numerical simulation[J].Progress in Geophysics,2009,24(1):348-356. |
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| Authors: | ZHANG Qian CHEN Chao LIU Jiang-ping |
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| Institution: | (InstituteofGeophysicsandGeomantic,ChinaUniversityofGeosciences,Wuhan430074,China) |
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| Abstract: | The shallow reflection method is a survey technique in common use. In data processing, the precision of static correction directly affects the results of inversion velocity and the quality of stacking profile sections. Under the condition of gentle topography, the routine datum plane static correction can satisfy the requirement of survey precision, but under the condition of complex topography it has big error, even the floating datum plane static also cannot eliminate the error because of the assuming surface-consistent. For the sake of improving static correction, residual static correction is necessary. This paper proposes the residual static correction of the seismic record in CMP gather after routine static correction on the running reference plane (the middle point level). The residual static has the relation with the offset, the buried depth of reflecting layer, the wave velocity and the elevation of the shot point and receiver site. It is applicable to the situation of both uniform and stratified medium. Based on the calculation and analysis of the velocity spectra of the theoretical geological model for three horizontal homogeneous bedded media under the condition of typical topographic relief, it is indicated that the result of this residual static correction to inverse the velocity approaches to the actual value better than that of the routine method and the residual static correction can really improve the precision of correction and ensure the gain of a stacking profile section with high quality. |
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| Keywords: | undulated topography residual static floating datum running reference plane |
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