Research progress on identification and carving methods of carbonate fracture-cavity reservoirs
In recent years,numerous carbonate rock fracture-cavity reservoirs have been discovered in domestic and foreign oil fields,all of which have achieved considerable economic benefits,such as the Yurubcheno Oilfield in Russia,the Yates Oilfield in the United States,the Halfaya Oilfield in Iraq,the Tahe Oilfield,the Tarim Oilfield,the Maokou Formation and the Dengying Formation in the Sichuan Basin and the Ordovician Formation in the Ordos Basin in China.How to accurately characterize the reservoir space of carbonate fracture-cavity reservoirs is a major technical problem faced by efficient exploration and development.This paper systematically summarizes the previous research results on the identification and carving of carbonate fracture-cavity reservoirs and teases out the latest progress in the study of fracture-cavity reservoir characterization under complex geological conditions,which has important reference value for understanding the development and distribution of carbonate reservoirs in China.Microscopically,carbonate fracture-cavity reservoirs have been qualitatively identified by seismic reflection properties such as"beaded reflection,linear weak reflection,and chaotic reflection".Microscopically,conventional logging and imaging logging were used to determine the location and morphological characteristics of the fracture-cavity development.For fracture-cavity reservoirs in complex geological environments,AI techniques could achieve great effects.In carving techniques for carbonate fracture-cavity reservoirs,multiscale techniques such as well-seismic combination,frequency splitting classification,multiattribute fusion,and"five-step"synthesis carving were mainly used for quantitative characterization.In general,with the continuous updating of the research technology of carbonate fracture-cavity reservoirs,the research of carbonate fracture-cavity reservoirs will develop toward the trend of"deep integration,generalization,complexity,refinement and intelligence".
Logging and seismic identificationFracture-cavity carvingFracture-cavity reservoirCarbonate rocks
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