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%.
Time and Heritage
As a historian studying what can be considered a form of intellectual history, I have slowly come to adopt Michel de Certeau’s observation made at the end of the 1980s that ‘objectifying the past, for the last three centuries, has undoubtedly left unconsidered time within a discipline that has continued to use it as a taxonomic instrument’. To a certain degree, time has become commonplace for the historian who has preserved or instrumentalized it. It is not considered because it is inconceivable, but because we do not think of it or, more simply, we do not think about it. As a historian attempting to pay attention to the time I’m living in, I have thus, like many others, noticed the swift development of the category of the present until it has become obvious that the present is omnipresent. This is what I refer to here as ‘presentism’.