涠西南凹陷涠洲B油田碳酸盐岩缝洞储层预测OA

The carbonate rock reservoirs in the rising plate of the No.1 fault zone in the Weixinan Depression are characterized by complex lithology and strong heterogeneity.Unlike reservoirs dominated by clastic rock pores and large karst reservoirs with"bead like"shapes,the dissolution pores in Weizhou B Oilfield have small pore sizes and multiple types of fractures,resulting in weak amplitude and chaotic reflections in the seismic response characteristics inside the buried hill.Conventional attribute and wave impedance inversion cannot effectively identify fracture cave reservoirs.In response to this issue,based on the analysis of core,thin section,drilling and logging data,it was first clarified that the reservoir types in this area are mainly fracture pore type,pore fracture type,and fracture pore type.Secondly,based on the differences between dissolution pores and fractures,separate predictions are made for both,and neutron curves are selected for waveform indication simulation inversion to predict the distribution characteristics of dissolution pores.Seismic multi-attribute and artificial intelligence are combined to predict fractures,and finally,the reservoir characteristics of fracture pores are comprehensively analyzed based on the fusion attributes.The research results indicate that fractures are developed in the high part of the B-E1 well area,while dissolution pores are developed in the low part.This achievement provides a basis for reserve research and well location deployment for development.