Geological Modeling And Oil-gas Migration Simulation Of Sanhe Village Depression In Jiyang Depression

In recent years,biogenic gases of various origins have been discovered in the shallow layers of the Jiyang Depression,which has revealed a good prospect for biogas exploration.At the same time,there is a development of heavy oil reservoirs under the shallow gas.There is some accompanying relationship between the two in space and cause.Therefore,it is necessary to further study the mechanism of the formation of viscous oils and degraded gases in the Jiyang Depression and their associated relationships.It is clear that the migration and characteristics of the degraded gases during the accumulation process and the degradation gas in the reservoir sand bodies.The location of major gathering provides some guidance for the exploration of heavy oil reservoirs and shallow gas reservoirs.Based on the understanding of the crude oil bacteriolysis process and the principle of conservation of crude oil bacteriolysis substances,a mathematical model for the degradation of crude oil was established using the material balance method of crude oil family,and the amount of crude oil,crude oil degradation and loss,and the amount of degraded gas generated were clearly defined.Calculate the relationship.The actual degradation gas production and degradation rate were calculated for the Sanhecun Depression and Linfanjia areas in the study area.To a certain extent,it reflects the range of the shallow gas in the study area,and provides the conditions for the degradation of gas volume for the transport and accumulation simulation of three-dimensional degradation gas.Based on the 2D Seismic section in the Sanhe Village Depression,a two-dimensional structural grid was built and meshed.The lithology,paleo-water depth,paleotemperature gradient,and paleo-heat flow value in the Sanhecun Depression were used as the basis.A two-dimensional geological model of the Sanhecun Depression was established to simulate the migration and accumulation of oil and gas in the basin during the rifting period and the depression period.The oil and gas accumulation and accumulation process in the heavy oil reservoir of the Sanhecun Depression was preliminarily analyzed.The characteristics of the transduction system and the characteristics of reservoir formation.Based on the logging data,fault data,logging data,and structural maps in the Sanhecun area,the three-dimensional geological model of the Sanhecun area was established.Using the established three-dimensional geological model,the three-dimensional degradation gas transport and accumulation simulation in the Sanhecun area was performed with the amount of degraded gas calculated from the crude oil degradation mathematical model.The simulation results showed the location of the degraded gas in the reservoir sand body,and the calculation was performed.The amount of degraded gas transported from the Guantao Formation below the Guantao Formation to various sand bodies in the Guantao Formation finally predicted the favorable areas for degradative gas accumulation in the Guantao Formation of the Sanhecun Depression,and provided Some guidance to the actual exploration for heavy oil and shallow gas reservoirs.