物探与化探2016，Vol.40Issue(6)：1185-1191,7.DOI:10.11720/wtyht.2016.6.20
乐东—陵水坡折带速度分析及时深转换方法
Velocity analysis and time-depth conversion study of Ledong-Lingshui slope-break belt
摘要
Abstract
In Ledong-Lingshui slope-break belt of Qiongdongnan Basin in western South China Sea,the stratigraphic dip changes a lot, the sedimentary facies is complex and there is abnormal high pressure zone. All these factors make the velocity analysis complicated while velocity is the key to convert time to depth and to predict pressure.So it is important to ravel out the velocity change rules and in-fluence factors in the slope-break belt.For this purpose,the authors analyzed the seismic velocity volume and well sonic data to get the velocity distribution regularity and found that it corresponds to the ordinary distribution rules except for an abnormal low velocity zone spread out from Lingshui to Huangliu formation,which fades away from shallow layer to the depth and from downslope to upslope. In combination with the geology and pressure information,it is found that the main factors influencing the velocity change rules include depth of water,formation dip, pressure, abnormal lithologic body et al. Based on above understanding, the authors applied the slope-break belt velocity volume to three sand bodies ' time-depth conversion. Different calibration cases are comparatively studied with the time-depth relationship and time/velocity/depth contour map.At last the most reasonable calibration methods were chosen for different sand proposal wells.关键词
坡折带/低速带/影响因素/压力/时深转换Key words
slope-break belt/abnormal low velocity zone/influencing factors/pressure/time-depth conversion分类
天文与地球科学引用本文复制引用
范芬,刘爱群,任科英,吴云鹏..乐东—陵水坡折带速度分析及时深转换方法[J].物探与化探,2016,40(6):1185-1191,7.基金项目
国家"十三五"重大科技专项 "莺琼盆地高温高压天然气富集规律与勘探开发关键技术"(2016ZX05024-005) （2016ZX05024-005）
