一个基于合成声波测井的计算机辅助岩性解释方法

THE COMPUTER- AIDED LITHOLOGIC INTERPRETATION BASED ON THE SYNTHETIC SONIC LOGS

本文提出一个计算机辅助岩性解释系统。本系统包括三个部分:岩性模式预处理、岩性模式特征选择和岩性模式分类。第一部份由交互式合成声波测井处理、含砂百分比计算和孔隙度计算组成。系统根据物探专家的知识,从模式预处理资料、地震资料及其变换参数中选取模式特征分量。本文又提出一个新的基于样本集聚集结构信息和统计信息的聚类算法。这种算法比ISODATA算法有效。系统在IBMPC/AT微机上运行,采用新的聚类算法对岩性模式进行分类。实际资料处理的结果证实了本系统有助于岩性分析和油气分布预测。

In this paper, a computer- aided lithologic interpretation system was presented. It consists mainly three parts: the lithologic pattern pre-processors, the lithologic pattern feature selector and the lithologic pattern classifier. The first part is composed of the interactive SSLOG processor, the sand- percentage processor, as well as the porousity processor. Based on the geophysicists' specialized know-how, the patterm(feature Components will be selected from the patterm) pre-processed data, the seismic data, as wall as their trasformation parameters. A new cluster algorithm was also presented in this paper, it was based on the cluster structural information and the statistical information of the sample set. Such an algori -thm is far more effective than that of the ISODATA. The system is operated on IBM PC/ AT and the lithologic pattern classification is implemented by the new cluster algorithm. It has been proved by the processed real data that such system is helpful to the lithologic analysis and the prediction of oil/gas distribution.