六盘山盆地油气地球化学特征及化探技术

六盘山盆地在我国主要含油气盆地中属高丰度、均匀-均匀地球化学场。背景场具有自东南(固原凹陷)向西北(海原凹陷)由高变低的趋势。依托盆地背景场的变化性,确定了数据处理、异常评价的技术方法。在指标分析的基础上,确定了有效化探指标组合,采用了新的异常提取技术,进行了结构异常和组合异常研究,发现了六盘山盆地化探异常具有区带性和明显的油显示异常特征。

OIL AND GAS GEOCHEMICAL CHARACTERISTICS OF LIUPANSHAN BASIN AND THE SUITABLE GEOCHEMICAL EXPLORATION TECHNIQUES

Liupanshan basin is a high abundance and uniform-nonuniform geochemical field in the main oil and gas basins of China, and its background tends to change from high to low from southeast (Guyuan depression) to northwest (Haiyuan depression). According to the variation characteristics of the geochemical background in this basin, the authors determined the techniques for data processing and anomaly appraisal. On the basis of index analysis, the effective geochemical index association was decided, new anomaly-extracting techniques were adopted, and the structural anomalies and composite anomalies were studied. It is found that geochemical anomalies show zoning and obvious oil-indicating characteristics.