The environment is favorable for the formation oil and gas ; ( 4 ) although the sedimentary environment in the two basins is cardinally identical , the evolution and difference in climate and sedimentary environemt decided the divergence of biotic characters in the two fault basins , and then the biota controlled the type and quality of fossil fuel
12.
Some conclusions are listed as follows : the plateform cover cap of ordos basin and its circumference areas can be divided into five tectonic sequences . the tectonic evolution of ordos basin can be classified in six stages : the basement formation phase ( from archeozoic to paleoproterozoic ) ; the aulacogen phase ( from mesoproterozoic to neoproterozoic ) ; the north china continental sea phase ( from sinian to early - paleozoic ) ; the north china intracratonic depression phase ( from late - paleozoic to early mesozoic ) ; large ordos inland basin phase and the formation of independent ordos basin ( mid - late mesozoic ) ; fault basin phase around the ordos basin ( cenozoic )
