The Study Of Interwell Connectivity In Fracture-vuggy Carbonate Reservoirs By Dynamic Data

Compared to clastic rock reservoirs,the multiphase structural reservoirs of carbonate fracture-vuggy reservoirs and the strong reservoir heterogeneity,complex interwell connectivity patterns,and uncertain relationship of interwell connectivity resulted from the palaeokarst function,greatly affect developmental effect during water injection of fracture-vuggy reservoirs.As a guiding for basic works of waterflooding exploration in fractured-cavity reservoirs,it is important to understand the interwell connectivity correctly in reservoirs.The existing static geological data can judge the inter-well connectivity mode and the connectivity type effectively,but it cannot make an effective judgment for the inter-well connectivity.Therefore,this thesis uses dynamic data to study the inter-well connectivity of carbonate fracture-vuggy reservoirs.The main tasks are as follows: 1.the research on inter-well connectivity of production wells relationship: Use the similarity law of production dynamics to analyze the inter-well connectivity in qualitative degree.Based on the results of qualitative analysis,the DTW algorithm is used to calculate the similarity of production dynamic characteristic curve,and a quantitative calculation model for inter-well connectivity based on multi-index weight analysis method is established to quantitatively calculate the connectivity degree between production wells;2.the research on inter-well connectivity of injection and production wells relationship: The injection-production response analysis is used to qualitatively analyze the interwell connectivity,and these results are used to establish a calculation model for connectivity between injection and production wells based on the Hagenpoort Suede theory,and quantitative calculations are made between injection and production wells.Respectively established by using the above two kinds of evaluation system of mine seam hole type reservoir analysis:(1)based on the relationship between the production wells interwell connectivity evaluation system for the use of natural energy mining seam hole unit interwell connectivity has a good effect of evaluation,the results accord with the results of field verified the connectivity degree reached 85%;(2)based on the relationship between the injection-production wells connectivity between evaluation system for the use of waterflood seam hole unit interwell connectivity has a good effect of evaluation,the results accord with the results of field verified the connectivity degree is85%.The results of the mine application show that the work done in this thesis can effectively analyze the interwell connectivity of fracture-vuggy units,which is of great significance for guiding the waterflooding development of fracture-vuggy reservoirs in carbonate rocks.