地震反演中测井数据的预处理

THE PREPROCESSING OF WELL LOG DATA FOR SEISMIC INVERSION

大港油田港东一区一断块是高含水、开发后期的老油田,地震反演是油田深入开发的一项基础工作,采用合理的技术,进行测井数据预处理,则是地震反演的关键环节。对区内大量多年的测井数据进行了的环境校正;以VSP速度趋势,作为声波测井低频速度趋势,对不同年代、不同型号仪器观测的测井曲线进行了标准化处理。在此基础上,研究了用自然电位和深探测电阻率重构拟声波曲线的模型,选择了深探测电阻率重构的拟声波曲线,突出了储层岩性的变化,为地震反演准确预测储层空间展布提供了可靠的测井资料。

Gangdong 1 area in the Dagang Oilfield is a mature oilfield with high water cut, so seismic inversion is the basic task for the deep development of the oilfield. The preprocessing of well-logging data by appropriate technique, therefore, is the key to seismic inversion. Environmental correction was carried out for the mass well-logging data in areas of interest. The well-logging data from different test periods and test equipments were normalized by using the VSP velocity trend as the low-frequency velocity trend for the acoustic log. Based on the results, the authors studied the acoustic log curves rebuilt through natural potential logs and deep investigation resistivity logs. In order to emphasize the lithologic variation, the authors also probed into the pseudo-acoustic log rebuilt with deep investigation resistivity logs, thus providing reliable well-logging data for seismic inversion that can predict formation distribution accurately.