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.