Abstract:

Through diagenesis, catagenesis and metagenesis, biological sources  form petroleum, natural gas, and coal. These
processes are controlled by organic  facies.  Integrating  sedimentology, organic petrology, and organic geochemistry, organic
facies  is  the most effective method  to evaluate  the petroleum, natural gas, and coal productivity potential of a certain basin. By
comprehensively analyzing  the geochemical condition  for petroleum, natural gas, and coal productivity,  this paper proposes
the  four end models based on maceral analysis  to characterize organic  facies and evaluate  the petroleum, natural gas, and coal
productivity potential. With the method, Mesozoic strata of the Ordos basin and late Permian Wujiaping age strata of the Southeast
China are depicted as upper woody plants facies (A), lower woody plants facies (B), lower woody plants-exinite facies (C), shallow
water woody plants-algae  facies  (D), deep water herb-algae  facies  (E), and aquatic algae  facies  (F). Typical oil source  rock and
humic coal are respectively  formed  in aquatic algal  facies and upper woody  facies. Upper woody  facies and aquatic algal  facies
are  the main  types of petroleum, natural gas and coal  rich basin such as Ordos basin, but other  transitional  facies are  found  in
Mesozoic strata of  the Ordos basin and Late Permian Wujiaping Age strata of  the Southeast China which extend  the genesis
theory of petroleum, gas and coal and multienergy exploration. By utilizing multistatistic analysis the authors develop an approach
to numerical  representation of organic  facies, build up  the organic  facies  type  index model which computes  the model value of
contribution of organic facies to the genesis of petroleum, gas and coal and provide the basic method for geochemical quantitative

modeling of combustible organic mineral concentration.

Key words: 沉积有机相；显微组分；成矿潜力；资源评价