【摘要】 琼东南盆地是南海深水勘探的重要目标,该盆地目前情况是钻井较少,勘探程度较低,勘探前景广阔。时深转换一直是琼东南盆地研究工作的重点,其中速度作为解释成果从时间到深度转换的重要桥梁,对于地质构造的勘探、钻孔的布置和设计都起着决定性的作用。琼东南盆地横向上平均速度变化较大,且井上速度与地震速度之间存在着井震误差。据统计分析发现,该区井震误差主要有3种类型,按形态特征分别命名为铁轨差、喇叭口差、剪刀差。研究了不同类型误差的校正方法,再应用于琼东南盆地深水区YL1井的时深关系预测,钻井结果证实预测时深关系准确。更多还原

【Abstract】 Qiongdongnan Basin is an important research object for deep-water exploration in the South China Sea. The Basin was cur- rently less drilled and explorated,but it had a wide exploration prospect. Time-depth conversion had been the focus of research in Qiongdongnan Basin. Velocity,as an important bridge of transforming the results of exploration from time to depth,played a decisive role in the exploration of geological structure and design of drill hole. The average velocity changed largely on the horizon in Qiongdong- nan Basin and there was a large deviation between seismic velocity and well velocity. According to statistical analysis,it was found that there were three types of deviation between seismic velocity and well velocity. Based on their morphological characteristics,they were named as track deviation,bell deviation and scissors deviation. The suitable correction methods of different types of well-seismic devia- tion were researched in the text,and were applied to the prediction of the time-depth relationship of Well YL1 which was located in Qiongdongnan Basin,and the result was proved accurate through drilling of the well.更多还原