Analysis of the Reasons for the Differences in Oil and Gas Enrichment Layers in the Nanpu M Fault Block Based on the Migration and Accumulation Process

To determine the cause of the difference in hydrocarbon enrichment in the Minghuazhen Formation within the Nanpu M Fault Block, Based on the transport and accumulation process of oil and gas entering the trap—transport—accumulation, and on the basis of the analysis of the relationship between the dynamics and resistance of each stage of oil and gas transport, the differences in the oil and gas transport conditions of each sub-layers within the trap of the fault block are clarified, and the reasons for the differences in hydrocarbon enrichment horizons in the Minghuazhen Formation within the Nanpu M Fault Block are further synthesized. The study shows that the differences in hydrocarbon entry and accumulation conditions in the sub-blocks of the Nanpu M fault block are the main reason for the differences in hydrocarbon enrichment horizons; the main reason for the difference in the ease of entry and accumulation of hydrocarbons in the trap is the difference in pressure between the transport faults and the reservoir-displacement pressures that block the faults in each sub-block; the pressure difference between the fault and reservoir-displacement pressures in each sub-layers is influenced by the fault spacing and reservoir thickness, but also by the lithological combination of the adjacent formations. The research understanding is a guide to the fine rolling development of fault block reservoirs.