| LIU Aiqun,CHEN Dianyuan,LI Wentuo,FAN Caiwei,HE Jianwei. 2015. Velocity model and time-depth conversion for the northwestern South China Sea deepwater areas. Acta Oceanologica Sinica, 34(4):56－61 |
| Velocity model and time-depth conversion for the northwestern South China Sea deepwater areas |
| 南海西北部深水区速度及时深转换方法研究 |
| Received:June 25, 2014 Revised:December 06, 2014 |
| DOI：10.1007/s13131-015-0649-0 |
| Key words:time-depth conversion velocity modeling deepwater areas continental slope South China Sea |
| 中文关键词: 时深转换 深水区 速度误差校正量 斜坡区 速度建模 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LIU Aiqun | Zhanjiang Branch of China National Offshore Oil Corporation Limited, Zhanjiang 524057, China | liuaq@email.cnooc.com.cn | | CHEN Dianyuan | Zhanjiang Branch of China National Offshore Oil Corporation Limited, Zhanjiang 524057, China | | | LI Wentuo | Zhanjiang Branch of China National Offshore Oil Corporation Limited, Zhanjiang 524057, China | | | FAN Caiwei | Zhanjiang Branch of China National Offshore Oil Corporation Limited, Zhanjiang 524057, China | | | HE Jianwei | Zhanjiang Branch of China National Offshore Oil Corporation Limited, Zhanjiang 524057, China | |
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| Abstract: |
| There are rich natural gas resources in the northwestern South China Sea deepwater areas, with poor degree of exploration. Because of the unique tectonic, sedimentary background of the region, velocity model building and time-depth conversion have been an important and difficult problem for a long time. Recent researches in this direction have revealed three major problems for deepwater areas, i.e., the way to determine error correction for drilling velocity, the optimization of velocity modeling, and the understanding and analysis of velocity variations in the slope areas. The present contribution proposes technical solutions to the problems: (1) velocity correction version can be established by analyzing the geology, reservoir, water depths and velocity spectrum characteristics; (2) a unified method can be adopted to analyze the velocity variation patterns in drilled pale structural positions; and (3) across-layer velocity is analyzed to establish the velocity model individually for each of the layers. Such a solution is applicable, as shown in an example from the northwestern South China Sea deepwater areas, in which an improved prediction precision is obtained. |
| 中文摘要: |
| 南海西北部深水区具有巨大的天然气资源,但整体勘探程度比较低,速度分析及速度建模难度很大.速度及时深转换方法研究一直是地球物理工作的重点和难点问题,而且深水区有其独特的构造沉积背景,近几年速度及时深转换方法研究发现深水区主要存在三方面的问题:深水区待钻井速度误差校正量如何确定、如何优选速度建模方法与流程和如何认识和分析深水斜坡区的速度变化规律.针对这三方面问题,本文提出了针对性的技术思路及解决方法:分析地质、水深、储层和速度谱特征建立速度校正量版、将今论古分析古构造位置已钻井的速度变化规律、沿层精细速度解释及分段速度建模,并将三种技术手段结合形成速度及时深转换流程,应用于南海西北部深水区钻井生产实际,取得了较高的预测精度. |
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