Abstract:

Cloud model，which is proposed based on the traditional fuzzy mathematics and probability statistics theory，is a conversion model between qualitative concept and quantitative values.In order to establish the quantitative and qualitative relationship between oil & gas reservoir and the trap area，trap closure amplitude，hydrocarbon migration channel，formation porosity，the relationship among the oil generation，trap forming and special compatibility，the imposed threshold was frequently involved in traditional way of multi-domain information assessment to build the relation model，which is limited by the experiences of experts to a great extent.With consideration on the fuzziness，randomness and uncertainty of small samples，a new approach to multi-domain information assessment based on cloud model and grey relational analysis is presented in this paper.With assessment to the traps of Shuntuoguole in Northwest China，type Ⅰ，Ⅱand Ⅲ traps are identified.Among them，typeⅠ accounts for 37.5% of the total，type Ⅱ takes up 37.5% and the proportion of type Ⅲ is 25%，which is consistent with practical development assessment.

Key words: trap assessment, multi-domain information, cloud model, grey relational analysis, uncertainty