测井约束下高精度叠前地震速度预测

doi:10.12108/yxyqc.20190410

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 92–100.doi: 10.12108/yxyqc.20190410

测井约束下高精度叠前地震速度预测

杜斌山¹, 雍学善¹, 王建功¹, 倪祥龙¹, 秦涛², 柴小颖²

1. 中国石油勘探开发研究院西北分院, 兰州 730020;
2. 中国石油青海油田分公司勘探开发研究院, 甘肃敦煌 736202

收稿日期:2018-10-27 修回日期:2019-01-10 出版日期:2019-07-21 发布日期:2019-06-21
第一作者:杜斌山(1970-),男,博士,高级工程师,主要从事地震反演、储层预测和油藏描述等方面的研究工作。地址:(730020)甘肃省兰州市城关区雁儿湾路535号。Email:dubs@petrochina.com.cn。
基金资助:
十三五国家重大科技专项"大型油气田及煤层气开发"（编号：2016ZX05007-006）、中国石油天然气股份有限公司重大科技专项"柴达木盆地建设高原大油气田勘探开发关键技术研究与应用"（编号：2016E-06）联合资助

High precision prestack seismic velocity prediction based on well logging constraint

DU Binshan¹, YONG Xueshan¹, WANG Jiangong¹, NI Xianglong¹, QIN Tao², CHAI Xiaoying²

1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
2. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China

Received:2018-10-27 Revised:2019-01-10 Online:2019-07-21 Published:2019-06-21

摘要/Abstract

摘要： 针对地震偏移成像处理预测的速度精度不高，难以满足精细时深转换和地震速度三维建模解释精度的要求，根据地震波动性及旅行时特征，提取出叠前地震道集速度数据中包含的速度特征信息，采用与测井声波速度相互转换、交叉验证、分层约束的速度建模方法，综合考虑地震预测的特征速度与测井声速之间的误差，采取分层段、分尺度三维约束校正，实现了地震低频速度信息和薄层速度相对高频信息相互融合。通过理论模型试算和实际数据测试认为：采取最佳时窗步长为15~20 ms，实现叠前地震道集中特征速度提取与在测井速度质量控制下连续速度的预测结合，该技术在地震成像处理、地震速度建模、构造变速成图等应用中有效地提高了地震资料处理和解释的速度精度。

关键词: 叠前地震道集, 连续速度, 井震联合, 高精度, 速度预测

Abstract: The prediction accuracy of velocity from seismic migration imaging processing is not high enough to meet the requirements of fine time-depth conversion and 3-D seismic velocity modeling. According to seismic wave and traveltime features,the velocity extracted from prestack seismic gathers was mutually converted, cross-validated and layered constrained with acoustic velocity of well logging to establish velocity model. On the consideration of errors between the seismic velocity and logging acoustic velocity,layered and subscale 3-D constraint correction was carried out to realize the fusion of low-frequency seismic velocity information and relatively high-frequency seismic velocity information of thin layer. The results of theoretical models and practical seismic data show that the best time window step size should be 15-20 ms for the seismic characteristic velocity and the continuous predicted velocity obtained under the quality control of logging velocity. This technology can be used in seismic imaging processing,seismic velocity modeling,variable-velocity structural mapping and so on.It has been proved that continuous velocity improved the accuracy of seismic data processing and interpretation.

Key words: prestack seismic gathers, continuous velocity, well seismic combination, high precision, velocity prediction

中图分类号:

P631.4

杜斌山, 雍学善, 王建功, 倪祥龙, 秦涛, 柴小颖. 测井约束下高精度叠前地震速度预测[J]. 岩性油气藏, 2019, 31(4): 92–100.

DU Binshan, YONG Xueshan, WANG Jiangong, NI Xianglong, QIN Tao, CHAI Xiaoying. High precision prestack seismic velocity prediction based on well logging constraint[J]. Lithologic Reservoirs, 2019, 31(4): 92–100.

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测井约束下高精度叠前地震速度预测

High precision prestack seismic velocity prediction based on well logging constraint

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