Abstract:In the study area located in the foothill belt in the southern edge of the Junggar Basin, the near-surface structure is the mixture of loess and gravel which changes drastically. Therefore, conventional near-surface modeling and static correction is less effective. In order to build a model of the near-surface structure for shot depth design and static correction, first we studied the characteristics of the near-surface zone in the foothill belt based on the uphole data, and summarized the near-surface velocity and time-depth relation. Then we proved the loess layer and the gravel layer have a good spatial autocorrelation in thickness by geostatistics, modeled the thickness of loess and gravel by selecting a best Kriging interpolation, and correct the model by the similarity coefficient of the bottom of loess or gravel and the surface to improve the modeling accuracy. Finally,we proposed a layered time-depth curve static correction and applied it to real data. The efficiency and effect of this static correction method are better than conventional methods.
崔庆辉, 尚新民, 腾厚华, 金昌昆, 赵胜天, 宋桂桥. 西部山前带黄土砾石区静校正方法[J]. 石油地球物理勘探, 2021, 56(2): 226-233.
CUI Qinghui, SHANG Xinmin, TENG Houhua, JIN Changkun, ZHAO Shengtian, SONG Guiqiao. Research on the static correction method for the loess and gravel area in western foothill belt. Oil Geophysical Prospecting, 2021, 56(2): 226-233.
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