Ultra-low Permeability Sandstone Reservoir Description And Numerical Simulation Applications

The Chinese land has clearly explored the unused oil reservoirs is more than a half of low permeate oil reservoirs, we have to summarize and consummate meticulous description on low permeate oil-field reservoirs as well as numeral simulation technique.The meticulous description and numeral simulation on low permeate oil-field reservoirs is a deeper problem on oil reserves meticulous description and numeral simulation. Natural fissure and manual fissure is not only a good factor to raise mobile capacity, but also a bad factor to lead to inundation. The key point on low permeate oil-field reservoirs is to research and descript on fissure growth regular, to research on well net and fissure orientation's adaptation, to research on low permeate oil reservoirs imitation model's parameters and adjusting range. Mobile unit meticulous dividing is to solve how to distribute cross section's multi layer mobile output. Lake faces delta sediment is good use fuzzy clustering and blur identification method to classify mobile unit. This borough has classified four mobile unit(A ,B ,C,D) , has established mobile unit's types and sedimentary faces, has fixed on connection between reposition and permeation. Low permeate oil-field's container rock has stronger lack of homogeneity. How to master reserve space's changing regular is a key to establish oil reserves simulation model.This paper takes Erduos basin's five inner bay for example, we research on low permeate oil reservoir's meticulous description and numeral simulation technique. Ore mass structural model is discrete random model, it is adopted faces controlling model technique to establish reservoir parameter distributing model. We use GOCAD establishing model software, apply variation function and correlation function to this model and take clarity information to restrict modeling process. Rock physic parameter's random model that is Gauss simulate its reservoir parameters.In order to control geologic body configuration and ensure modeling precision, we adopt grid mode is 25m×25m×0.5m,it sums to 496×532×110=29025920 grids. According to individual-layer data, we use GOCAD modeling software to get layer model. Three dimension has 5 layer and 6 layer construct model.To attain oil reservoirs numeral simulation precision and economical demand, we use 50m between them, portrait grid average distance is 3m, total grids are 247×265×23= 1505465.Porosity data takes arithmetic average method to wide grid, percolation rate data takes geometry average method to wide grid. From the five inner bay oil-field originality well data as well as wide before and end reservoir parameter's histogram contrasting, we can see simulation data do a good resume to original parameter's distributing, wide result's parameter is consistent to simulation data. So, simulation result and wide result are in reason.Unusual low permeate sand stone's oil reservoirs digital simulation is different to others. There are four reasons: the first is whether to meticulous depict unusual low permeate sand stone oil reservoir, the second is whether to realize oil reservoir's lack of homogeneity and...