Research on resource potential of middle-shallow source rocks of the northern part of Songliao Basin with hydrocarbon-generation potential method

Key words:  Songliao Basin  hydrocarbon expulsion threshold  hydrocarbon-generation method  hydrocarbon expulsion characteristics  resource potential

Abstract:

Based on the data of pyrolysis and total organic carbon，the hydrocarbon expulsion characteristics and resource potential of four main source rocks of K, qn, , K,qn2+3，and Kjn2 in middle-shallow section in the northern part of Songliao Basin were studied by hydrocarbon-generation method. The results show that the depth of hydrocarbon expulsion threshold decreases with the decrease of geological age of the four source rock formations, and the depth of hydrocarbon expulsion threshold of K,qn,，K,qn2+3 , K,!!, and K,n2 are 1.3, 1.2, 1.0 and 0. 95 km respectively. ，Kjii, and K,n2 sourcerock formations reached their hydrocarbon expulsion peak at late Cretaceous Mingshui group sediment period while K, qr^ and K]qn3 got those expulsion peaks at Paleoclimatic Sifangtai group and Taikang group sediment period respectively. The accumulated hydrocarbon expulsion amount of the four source rock layers are 487. 1 x 108 1. The prospective resource extent is about 97.4 x 108 - 194. 8 x 108 t，which shows great resource exploration potential.