Abstract:

Source-similar fabric anomaly is used to express the comprehensive characteristics that can reflect the fabric being similar to those of light hydrocarbon component in subsurface reservoirs,which is usually necessary to have exact meanings in geology and geochemistry and reflects the change of hydrocarbon fabrics,so as to indicate more definitely the existence and location of oil/gas reservoirs.By using entropy-value analysis, Marsh distance analysis and clustering analysis,various indexes or their composite characteristics in the study area can be calculated,and the range of favorable numerical values will be determined, anomaly parameters can be chosen,and prospective areas can then be delineated.The method of source-similar fabric anomaly has been proved to have obviously more advantages than the anomaly analysis of total hydrocarbon concentration, which will have good prospects in the future.

Key words: source-similar fabric anomaly, concentration anomaly, fabric parameters, entropy-value anomaly, Marsh distance anomaly