Abstract:

Hydrocarbon accumulation conditions of carbonate buried-hill are favorable in Nanpu Sag, and hydrocarbon enrichment is controlled by multiple factors like stratigraphy, structure and reservoir.Development and distribution of quality reservoir are the focus of the research.In-depth analysis of drilling, logging, core and other data reveals that the main reservoir type is fractured-vuggy carbonate reservoirs in Nanpu Sag, with dissolution pores and vugs as the dominant reservoir space and fractures as the main channels connecting the pores and vugs.Carbonate sedimentary facies zones, diagenesis (including karstification), and tectonic process are the main factors controlling on the development of high-quality carbonate buried-hill reservoirs.The favorable sedimentary facies are the basis of reservoir development, the favorable diagenetic epigenesis is the guarantee of reservoir development and the favorable tectonic process is the key to reservoir development.The precision of reservoir prediction is significantly improved through comprehensive seismic and geological reservoir prediction based on layer subdivision.

Key words: fractured-vuggy reservoir, reservoir distribution prediction, carbonate reservoir, Nanpu Sag