明水组

滨北地区嫩江组三、四段，明水组，四方台组和新生代地层中的泥岩有机碳普遍较低，均值仅为0.8～0.9，TOC＞1%的样品均不足总样品的40%。

TOC in the source rocks of the third section and the fourth section of Nenjiang , Mingshui group , Sifangtai group , Cenozoic is lower . The average of TOC is 0.8 % ~ 0.9 % , and the samples of TOC > 1 % are less 40 % .

因此，明水组沉积末期成为油气成藏的主要时期。

Hence the major period for hydrocarbon accumulation is the late period of the Mingshui Formation deposition .

大约为1.87%，表征固体沥青现今的成烃潜力较小，原油向天然气转化主要发生在高成熟阶段的晚期，对应的地质年代大约是嫩江组-明水组沉积末（80-65Ma）。

It shows that potential of generating hydrocarbon of the solid bitumen is low nowadays , oil was cracked to natural gas during the later period of high mature stage , corresponding geologic age is about the sedimentary time between the Nenjiang formation and Mingshui formation ( 80-65 Ma ) .