基于双平方根算子的速度建模方法及应用

doi:10.7657/XJPG20230117

摘要/Abstract

摘要：

准噶尔盆地南缘地表起伏剧烈，表层与深层地质结构不能满足常规地震资料处理方法的假设条件，成像效果不理想，地震解释深度与钻井实测深度误差较大。为提高该地区地震资料处理质量，利用双平方根算子速度建模的优势，探索了一种基于起伏基准面的地震资料处理方法，减小了共中心点道集水平基准面校正对波场产生的畸变，为叠前偏移提供了接近真实观测面的速度场，实现了时间域与深度域基准面的有效统一。新方法地震资料处理效果好，偏移成像归位准确，聚焦性好，测井与地震的深度误差明显降低，可供类似复杂山地地震资料处理借鉴。

关键词: 准噶尔盆地, 南缘, 偏移成像, 双平方根算子, 基准面, 复杂山地, 速度建模

Abstract:

The southern margin of the Junggar Basin is a mountainous area with severe surface fluctuations. The conventional seismic processing method cannot meet the needs of the assumptions of the processing method due to the actual geological structure of the surface and deep layers，resulting in an unsatisfactory imaging effect and a large error between the interpreted depth and the measured drilling depth. In order to improve the quality of seismic data processing in the area，a seismic data processing method based on rugged datum was explored by using the velocity modeling with double square root operator. The method can reduce the distortion of wave field caused by the horizontal datum correction of the common midpoint (CMP) gather and provide a velocity field similar to the real observation surface for pre-stack migration，thus realizing the efficient integration of the time-domain datum and the depth-domain datum. The actual application of the new method show good seismic data processing results，with accurate migration imaging homing，satisfactory focusing，and significantly reduced error between the depth obtained from seismic interpretation and the depth measured by drilling. The new method provides a reference for seismic data processing in similar mountainous areas.

Key words: Junggar basin, southern margin, migration imaging, double square root operator, datum, mountainous area, velocity modeling

中图分类号:

TE132.14

阿力甫江·热合木吐力, 潘龙, 李献民, 林娟, 马晶晶, 窦强峰. 基于双平方根算子的速度建模方法及应用[J]. 新疆石油地质, 2023, 44(1): 119-124.

Alifjian REHMTULY, PAN Long, LI Xianmin, LIN Juan, MA Jingjing, DOU Qiangfeng. Development and Application of Velocity Modeling Method Based on Double Square Root Operator[J]. Xinjiang Petroleum Geology, 2023, 44(1): 119-124.

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