An evaluation of hydrocarbon source Rocks of early cretaceous langshan Formation in the cuoqin basin

摘要

In this paper the abundance, types and thermal evolution of organic material are studied in the Langshan Formation of Lower Cretaceous in the Cuoqin basin. This formation is a suit of carbonate rocks and 1493.4 m thick. For thydrocarbon source rocks in it, the average content of organic material is 0.12 /100, the contents of chloroform asphlat 'A' are mostly 40-60 ppm, and the hydrocarbon-generating potential capacity is more than 0.25 mg/g. The types of organic material are sapropel and saprople-humus.