起伏地表TTI各向异性速度建模技术在柯东复杂山地的应用

doi:10.13810/j.cnki.issn.1000-7210.2022.S1.011

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摘要柯东复杂构造带位于塔里木盆地西南部，构造变形严重，表层覆盖厚黄土，地震资料信噪比极低，导致地震成像极差。为此，采用东方地球物理公司自主研发的GeoEast-Diva软件开展了起伏地表TTI介质速度建模和偏移成像研究。首先，采用菲涅耳体层析方法反演近地表速度模型，并嵌入中、深层速度模型；然后，在古近系地层上、下分别应用Kirchhoff和高斯束偏移速度分析方法更新起伏地表各向同性速度模型；最后，通过井震联合的方法获得各向异性参数模型，通过地质层位解释获得地层倾角信息，建立了TTI各向异性初始速度模型，再通过网格层析反演技术更新各向异性参数模型。应用结果表明，基于TTI速度模型的起伏地表Kirchhoff叠前深度偏移清晰地展示了新、老地层角度不整合的接触关系，验证了GeoEast-Diva软件和起伏地表TTI速度建模技术在西部复杂地区的有效性。

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	李忠
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关键词 ：柯东构造带, 复杂地表, 菲涅耳体层析, 起伏地表速度建模, TTI, 叠前深度偏移

Abstract：Kedong complex structural belt is located in the southwest of Tarim Basin and covered by thick loess. The low signal-to-noise ratio of its seismic data results in poor seismic imaging. This paper employs copyrighted GeoEast-Diva software developed by the Bureau of Geophysical Prospecting Inc. (BGP) to construct irregular surface TTI anisotropic velocity model from surface to target zone and migration. Firstly, the near-surface velocity model is inverted by Fresnel volume tomography and then embedded in velocity models of middle and deep layers. Secondly, Kirchhoff migration and Gaussian beam migration velocity analysis methods are adopted at the upper and lower layers of the Paleogene respectively to obtain the isotropic velocity model. Lastly, the anisotropic parameter model is obtained by integrating logging and seismic data. Combined with dips obtained from geological horizon interpretation, the paper builds a TTI anisotropic velocity model. Application results show that the Kirchhoff prestack depth migration based on the TTI velocity model for the irregular surface can clearly present the contact relationship of the angular unconformity between new and old strata. Additionally, this paper also proves the effectiveness of GeoEast-Diva and irregular surface TTI velocity modeling technology in mountainous areas of western China.

Key words： Kedong structural belt complicated surface Fresnel volume tomography irregular surface velocity modeling TTI prestack depth migration

收稿日期: 2022-02-23

PACS:

P631

基金资助:本项研究受中国石油天然气集团公司项目“地震处理解释关键技术研究与智能化软件研发”（2021ZG03）资助。

通讯作者: 李忠,四川省成都市天府新区滨河路一段95号东方地球物理公司物探技术研究中心成都分中心,610213。Email:cdlizhg@163.com E-mail: cdlizhg@163.com

作者简介: 李忠高级工程师,1968年生;1990年本科毕业于石油大学,获勘察地球物理专业学士;2007年获成都理工大学地球探测与信息技术专业博士学位;现就职于东方地球物理公司物探技术研究中心成都分中心,主要从事地震资料处理方法研究。

引用本文:

李忠, 赵锐锐, 周强, 陈丹, 彭更新, 左安鑫. 起伏地表TTI各向异性速度建模技术在柯东复杂山地的应用[J]. 石油地球物理勘探, 2022, 57(s1): 70-77. LI Zhong, ZHAO Ruirui, ZHOU Qiang, CHEN Dan, PENG Gengxin, ZUO Anxin. Application of irregular surface TTI anisotropic velocity modeling technology in Kedong complex mountains. Oil Geophysical Prospecting, 2022, 57(s1): 70-77.

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http://www.ogp-cn.com/CN/10.13810/j.cnki.issn.1000-7210.2022.S1.011 或 http://www.ogp-cn.com/CN/Y2022/V57/Is1/70

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