Lateral Transformation Migration Of Oil And Gas To Sand Body Along Fault And Its Controlling Roles On Oil-gas Accumulation

In order to study the conversion conditions,transition horizons and transformation paths of oil and gas migration and its control effect on oil and gas migration and accumulation in the lateral migration and transfer transfer system along the fracture to the sand body,in this paper,we studied that whether the overlying regional caprock is closed,the relative size of the displacement pressure and the relative pressure of sand body displacement pressure or the ratio of sand to ground ratio in the fault zone,whether the predominant transmission channel of the convexity ridge of the fault and the sand body are connected or the size of the distance between them,and the relationship between the period of fault transporting oil and gas and the time of transporting oil and gas in the sand body,then combined with examples,the transformation conditions of lateral migration of oil and gas to sand body along fault migration,and the temporal and spatial validity of conversion horizon and transformation path are studied respectively.The following conclusions and understanding have been achieved in the comprehensive study.The first is that the transition condition of lateral migration of oil and gas to sand body along fault migration is that the upper part of the transport fault must be covered by regional caprock.The second is that oil and gas may migrate laterally to the strata with relatively low displacement pressure or high sand to ground ratio.The third is that the transport channel between the convex fault ridge and the sand body constitute the path of lateral migration and transformation of oil gas to sand body along fault migration,and when the two links are close or relatively close,the matching of their transition paths is good and vice versa,also when the oil and gas time of the fracture transfer and the period of the sand body transport oil and gas period,it is beneficial for the migration of oil and gas to the sand body along the fracture,and the time matching is good,and vice versa is bad.The fourth is that the control of migration of oil and gas along the fracture to the lateral migration of the sand body is mainly reflected in the conversion layer to control the migration and accumulation of oil and gas,the conversion path is controlled by the distribution of oil and gas,and the time and space efficiency of the conversion path controls the enrichment of oil and gas in three aspects.