The integrative research of 3D geological modeling and reservoir numerical simulation
With the rapid development of computer, the integration research of geological modeling and numerical simulation is more and more emphasized in oilfield. In this paper, the flow mathematical model is established, which considers starting up pressure gradient for low permeability reservoir. Based on the research of the geology characteristics, fine stratigraphic correlation and sedimentary facies, the 3D geological model is established through integrated research considering geology and reservoir, including facies model, oil saturation model, porosity model, permeability model and NTG model. Then the remaining oil distribution was calculated through fine reservoir simulation. Based on history match, the distribution of remaining oil is analysed through the research of deposition facies and flow layer, which can be used for reference on oilfield development potential adjustment and scheme design.
Numerical simulation of imbibition oil recovery for low permeability fractured reservoir
Based on mechanism of imbibition oil recovery in low permeability fractured reservoir, a mathematical model of dual porosity and dual-permibility imbibition oil recovery is established, and numerical solution method and the acquiring-value method of flow coefficient are presented. Through the verification of practical example, the corresponding water-cut index, which is calculated by this method, meets the practical value of field site satisfactorily. On the basis of it, the main influential factors of imbibition oil recovery are quantitatively analyzed. The conclusion is that: those hydrophilic reservoirs, of which the permeability ratio of fractures to matrix is more than 100, the fracture density is more than 0.030 item per meter and the viscosity ratio of oil to water is less than 15 and the capillary force is greater, is suitable for imbibition oil recovery, and imbibition oil recovery can enhance waterflooding recovery ratio more than 1%.
The potential vorticity flux through the Yucatan Channel and the Loop Current in the Gulf of Mexico
Two‐year‐long time series of current and density structure measurements across the Yucatan Channel's main section allow the calculation of the time‐dependent potential vorticity flux between the Gulf of Mexico and the Caribbean Sea, which is characterized by alternating periods of positive (cyclonic) and negative (anti‐cyclonic) vorticity influx. Periods of negative cumulative vorticity influx are related to the Loop Current extending into the Gulf of Mexico, whereas periods of positive cumulative vorticity influx relate to a Loop Current retraction, sometimes coincident with the shedding of an anti‐cyclonic eddy.