Reef-shoal Reservoir Description And Production Potential Analysis In Longgang Gas Field Trial Production Area

Reef and beach reservoirs are belonged to subtle reservoir which contain a lot of oil and gas resources.Longgang district is located in the northeast of Sichuan basin,which is low levels of drilling area.The deep reef and beach gas reservoir is the important exploration area of Sichuan basin in recent years.Longgang district reef,beach reservoir in three dimensional space formed by multiple independent reservoir body staggered superimposed.The lithological facies of main gas production layers have much change on the transverse and gas content is not clear.Long-term experience in exploration and development indicate that reefs and beach gas reservoir have good permeability,high single well production and high storage of single reservoir,which is worth to be studied in detail.However,reefs and beach reservoirs are characterized by wide distribution,small volume,and small property differences between rocks and surrounding rock,strong heterogeneity,uneven distribution of longitudinal and transverse and deep buried.So it is difficult to predicting reef and beach gas reservoirs.In this paper,based on previous research,take the reservoir geology,geology in reservoir development,sedimentology and logging as a guid to understand longgang gas reservoir geological characteristics and reservoir heterogeneity and calculate the static and dynamic reserves of gas reservoir.Gas reservoir pressure system and connected,and gas content distribution,gas reservoir potential,structural and stratigraphic features,sedimentary facies,diagenesis description,reservoir fluid characteristics and gas reservoir type,pressure,connectivity description,gas reservoir reserves calculation and evaluation have been studied carefully.Through the study of this paper,the system summary of longgang district exploration area of reservoir,gas reservoir distribution characteristics,the pressure system are established and the spatial distribution characteristics of fluid are predicted.The study of this paper is useful for guiding the further development of reef and beach gas reservoir in longgang district.At the same time,the research methods and ideas can also be used for the reefs and beach gas reservoir research in other areas.