Study On Characteristics Of The Transport System Of Deep Gas Reservoirs In The Dehui Fault Depression,Songliao Basin

In this paper,the theory and method of petroleum geology,sedimentology,tectonic geology and oil and gas geochemistry are used to study the deep oil and gas transport system in the Dehui fault depression of the Songliao basin.The main transport factors in the study area include the sand bodies of Yingcheng,Shahezi and HuoShiling formation,the unconformity of the bottom of Yingcheng Formation and the faults developed during the fault period.The sand bodies of each layer in the northwest and south parts of the study area are of great thickness,good connectivity,good physical properties and high transport coefficient of sand bodies,which are the dominant channels for lateral migration of oil and gas.Most of the faults developed in the fault depression period of the study area are high dip positive faults,which basically break through Huoshiling to Yingcheng Formation.The sealing of faults is poor,and most of them can communicate with lower source rocks and upper reservoirs.It is a good channel for the vertical migration of oil and gas,and the high value zone of the fracture conductivity coefficient is mainly distributed in the midwest of the research area.The unconformity surface at the bottom of Yingcheng formation is one of the important conductance of the gas reservoir in Yingcheng formation.The main type of unconformities is "upper-Super-erosion type".In most areas,the complete "three layer structure" is developed.The high value of unconformity transport coefficient is mainly distributed in the western part of the study area.It is a favorable channel for long-distance oil and gas transmission.The research area has found that the gas reservoir is well matched with the high conductivity coefficient region of each transport factor,and the transport system is an important factor in the hydrocarbon accumulation in the study area,and the favorable exploration area of the deep gas reservoir in the study area is predicted by the superimposition of various transport factors.The A-type favorable areas of each layer are mainly distributed in the area of de Shen 21 well to Nong 103 well.,which is the favorable exploration area with the best transport conditions.