| 黄土塬覆盖区的层析反演静校正方法研究 |
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| 引用本文： | 周衍, 饶莹. 2019. 黄土塬覆盖区的层析反演静校正方法研究. 地球物理学报, 62(11): 4393-4400, doi: 10.6038/cjg2019N0304 |
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| 作者姓名： | 周衍 饶莹 |
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| 作者单位： | 1. 中国石油化工股份有限公司石油物探技术研究院, 南京 211103; 2. 中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249 |
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| 基金项目： | 自然科学基金优秀青年项目（41622405）资助. |
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| 摘 要： | 我国北方地区黄土塬覆盖区的静校正问题是地震数据处理中的难点问题之一.黄土塬表层覆盖巨厚黄土，高差起伏较大，地震静校正问题严重；而且黄土塬覆盖区的潜水面普遍较深，常规折射静校正方法无法取得令人满意的处理效果.本文针对黄土塬覆盖区的静校正难题，研究层析反演静校正方法在黄土塬地区的适用性和可靠性.层析反演静校正利用地震波初至走时数据、通过迭代反演的方法构建速度模型，进而依据所得的近地表速度模型对地震数据进行静校正处理.本文的迭代反演采用同步迭代重构算法（SIRT），并且对同步迭代重构算法进行了改进，使得层析反演的迭代过程趋于稳定.但是，因为黄土塬覆盖区地表高程的横向变化剧烈，相邻检波点的高差及其静校正量有时差异很大，在运用层析静校正求取长波长静校正量的同时，还需采用初至波剩余静校正方法求取短波长静校正量.实例证明，综合应用依据初至波走时数据的层析静校正和剩余静校正方法，同时计算长波长和短波长的静校正量，能够有效地解决黄土塬覆盖区实际地震资料的静校正问题.
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| 关 键 词： | 层析反演 静校正 复杂地表 层析静校正 黄土塬 |
| 收稿时间： | 2019-07-12 |
| 修稿时间： | 2019-08-28 |
Tomographic static corrections in loess plateaus |
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| ZHOU Yan, RAO Ying. 2019. Tomographic static corrections in loess plateaus. Chinese Journal of Geophysics (in Chinese), 62(11): 4393-4400, doi: 10.6038/cjg2019N0304 |
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| Authors: | ZHOU Yan RAO Ying |
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| Affiliation: | 1. Sinopec Geophysical Research Institute, Nanjing 211103, China; 2. China University of Petroleum(Beijing), State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China |
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| Abstract: | Static correction in loess plateaus of northern China is one of the difficult issues in seismic data processing. The thick loess cover, large terrain relief, and very deeply buried water table make the conventional static correction method not be able to produce satisfactory results. To resolve this problem, this paper envisages the applicability of a tomographic static correction method. It reconstructs a near-surface velocity model iteratively using first arrival times, and then performs static corrections based on this model. During this process, the Simultaneous Iterative Reconstruction Technique (SIRT) is modified to stabilize the iterative inversion. However, due to a strong lateral variation in the elevation of the loess plateau, there are large static differences between adjacent receiving points. So when using this method to calculate the long-wavelength correction value, the first-arrival residual statics which have short wavelength should be calculated simultaneously. Case studies show that such a strategy, which uses the first arrival times to conduct both tomographic statics and residual statics correction and calculates long- and short-wavelength correction values at the same time, is capable to resolve the static issue effectively for seismic data of loess plateaus. |
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| Keywords: | Tomographic inversion Static correction Complex near surface Tomostatics The loess plateau |
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