变质岩潜山储层垂向分带及其特征——以渤中19-6构造为例OA

The successful of the large condensate gas field in the metamorphic buried hill of Bozhong 19-6 structure has advanced the new phase of buried hill hydrocarbon exploration in the Bohai Bay Basin.To clarify the types and characteristics of the metamorphic buried hill reservoir in further,this study comprehensively uti-lizes various geological data,well logging curves,and log data to conduct a reservoir study from multiple per-spectives,including lithology,well logging curves response characteristics,fracture development,elements-minerals variation patterns,and reservoir types.The result shows that the metamorphic buried hill in Bozhong 19-6 structure can be divided into weathering crust belt and buried hill interior belt in vertical.Those two first-order vertical units can be identified based on a sudden increase in the mean value of the resistivity curves,a transition of the acoustic curves from a combination of finger-shaped and serrated box-shaped to a micro-serrated pattern,and a change from relatively wide network-like fractures to micro-fractures in relatively consis-tent occurrence.Furthermore,based on the weathering degree features,elements-minerals evolution,varia-tions in well logging curves,and the development degree of pores and fractures,the weathering crust belt is sub-divided into clay zone(undeveloped in study area),weathered conglomerate zone,leaching zone,and disinte-gration zone.And the buried hill interior belt is subdivided into interior fracture zone and the tight zone.A res-ervoir development model for the metamorphic buried hill in the Bozhong 19-6 structure is established.This study also indicates that the favorable reservoirs in metamorphic buried hill in study area are primarily the pore-type and some fracture-pore type reservoirs in the weathered conglomerate zone,and the fracture-type reser-voirs in the interior fracture zone.And the secondary preferred reservoirs are pore-fracture type and fracture-pore type reservoirs in leaching zone,as well as the disintegration zone.