Abstract: A method for quantitatively analyzing the reservoir formation of an ultra-deep evaporite-dolomite paragenesis system is performed as follows. A typical drilling core containing the evaporite-dolomite paragenesis system and a field section are observed. The logging data is subjected to single-factor analysis to determine the planar distribution regularity of the ultra-deep evaporite and the dolomite, and the analysis of sedimentary combination pattern and development evolution regularity is performed. The diagenetic system is determined, and the reservoir formation of the evaporite-dolomite paragenesis system is analyzed. Based on the above technical solutions, the property, the evolution path and the reservoir formation of sedimentation-diagenesis fluids in the evaporite-dolomite paragenesis system can be clarified.

Abstract: A method for quantitatively analyzing the reservoir formation of an ultra-deep evaporite-dolomite paragenesis system is performed as follows. A typical drilling core containing the evaporite-dolomite paragenesis system and a field section are observed. The logging data is subjected to single-factor analysis to determine the planar distribution regularity of the ultra-deep evaporite and the dolomite, and the analysis of sedimentary combination pattern and development evolution regularity is performed. The diagenetic system is determined, and the reservoir formation of the evaporite-dolomite paragenesis system is analyzed. Based on the above technical solutions, the property, the evolution path and the reservoir formation of sedimentation-diagenesis fluids in the evaporite-dolomite paragenesis system can be clarified.

Abstract: A method for predicting a source rock by paleoenvironment restoration includes: (1) measuring a content of each mineral; (2) judging whether a sedimentary environment is a marine facies or a non-marine facies by utilizing element combination forms of Sr/Ba, B/Ga, Th/U, Fe/Mn and Sr/Ca; (3) judging a specific numerical value of a paleosalinity through a boron element and comparing the same with a current normal seawater value to deduce whether the current sedimentary environment is a saline water or non-saline water sedimentary environment; (4) judging an oxidation or reduction environment during sedimentation through element combination forms of (Cu+Mo)/Zn and V/(V+Ni); and (5) comprehensively analyzing the sedimentary environment, restoring a relationship between a palaeosedimentary environment and a source-reservoir configuration.