台西盆地某坳陷油气地球化学异常特征与评价

采用沉积物、海水等不同介质，应用７种方法在台西盆地某坳陷开展了油气地球化学综合调查。根据指标间的相关性、共生与伴生组合等进行指标分类和统计分析，在地球化学场和场源分析的基础上，结合地质－地球物理资料，圈定了３个Ⅰ级异常区、２个Ⅱ级异常区和２个Ⅲ级异常区，为该坳陷油气远景评价提供了可信的地球化学依据。同时，也证实了化探方法和指标在海洋油气资源勘探中的有效性。

GEOCHEMICAL ANOMALIES AND HYDROCARBON POTENTIAL OF A DEPRESSION IN WEST TAIWAN BASIN

Geochemical exploration for oil and gas was carried out in a depression in the West Taiwan Basin. Seabottom water and sediment were sampled and determined by seven methods for over 40 indices: The correlation and association of the indices were statistically analyzed. Geochemical fields and their sources were studied, and geochemical anomalies were delineated. These anomalies correspond well with the structure traps identified from seismic data. Based on geochemical characteristics and geological background, these anomalies were ranked as three first-class. two second-class, and two third-class ones. The result provided reliable geochemical evidences for the assessment of hydrocarbon potential of the depression. It also demonstrated the effectiveness of geo-chemical methods and indices for the exploration of oil and gas resources.