Organic matter types of core SB01 from the Sanshui Basin were analyzed using organic petrology method and RockEval pyrolysis. Based on organic petrology results

the organic matter is dominated by type II (including type II1 and type II2)

mostly type II1. Type I organic matter intermittently occurs at some intervals while Type III organic matter is occasional in presence. Pyrolysis results show that the organic matter is of lower thermal maturity and the organic carbon loss could be ignored

as indicated by the lower Tmax values. Organic matter of Types I

II1 and II2 was deposited under arid

drier and humid climate conditions

respectively. The uppermost part of the Xinzhuang Formation is characterized by Type II1

related to a dry climatic condition. Submember A of the Honggang Member is dominated by organic Type II2

sandwiched by Type I and II1

suggesting a prevailing humid climatic condition. Submember B is characterized by alternations of organic Types II2 and II1/I

reflecting rapid fluctuations of humid and dry/arid climatic conditions. Submember C shows Type II1 and I in the lower part and shifts to Type II2 in the middle and upper parts

indicating a dry/arid climate condition followed by a prevailing humid climatic condition.