Study On Undergrand Gas Storage Rebuilt From Bannan Condensate Gas Reservoir

Accompany with the rapid development of the economy in our country, the proportion of energy consumption of natural gas is becoming lager and lager. But contrary to this optimistical phenomenon, the question which is the contradiction between supply and demand is becoming aculeate increasingly. Now the effective way to resolve this question is to build a gas storage near the terminal consumer. Bannan gas storage is a solution to the natural gas contradiction in Beijing and Tianjin. In order to analyze the feasibility of Bannan gas storage, describe the running indexes quantitative, some aspects have done detail study which is based on the theoretical basis of dynamic and static combination, such as the stratigraphic sequence, microfacies, reservoir property, 3D geological model, running mechanism and program designing and so on. This research affords a practicable program to the rebuilding of Bannan gas storage.1) This study carries out the high resolution sequence stratigraphy research, divides Binâ…£oil formation into 6 layers, carries on the stratigraphic correlation to the short-term cycle, and establishes high resolution sequence stratum of the research area.2) Based on the Observation and description of B884 cores, it is determined that the sedimentary system in the study area is beach-bar, and base on the analysis's foundation of body type and the facies model, the distribution of plane and vertical distribution is studied in detail.3) The reservoir heterogeneity of plane, interlayer and intraformational is studied, and establishes research division standard, analyze identification sign of intercalation contributing factors in the objective interval, and study the distribution characteristic; Combines with the flow characteristic, this research divides this reservoir into four kinds of flow units, studies interior distributed rule, and synthesizes the reservoir various aspects characteristic research to select the appropriate body position for the gas storage construction.4)Combined with the detailed geological research achievement, this study establishes three dimensional fine geological model of Bannan gas storage(structure model, microfacies model, porosity model, permeability model), fits the reserves, and calculates effective porosity volume of water and gas sand body in the initial condition.5) The composition experiment is simulated, such as the CCE and the CVD and so on, and the composition data is restored to initial state. Combining development dynamic model, has carried on the fitting to the production history of gas reservoir, in this basis, analyzes the saturation distribution characteristic, calculates residual gas volume, the gas leakage volume and the water body invasion volume.6) In the foundation of production history fitting, this article does a detailed study on the movement mechanism, analyzes the influence water body size, the capacity of injection and production, the recovery ratio of condensate oil, etc. on gas storage storehouse movement, establishes operational factor foundation of the gas storage; Finally, analysis the supply and demand relationship of natural gas, designs three program, according to the forecasting results, the appropriate scheme is selected and can provide the theory and the technical guidance for the gas storage.