Abstract：A major hydrocarbon reservoir has been discovered in the deep Paleozoic carbonate buried-hill in southwestern Bozhong sag,Bohai Bay Basin. The strong heterogeneity of carbonate karst reservoir was revealed through well data. The sedimentary facies is determined to be the main controlling factor in the development of the karst reservoir. In this study,cores and thin sections were described in terms of sedimentary fabric,while log facies,trace elements and palaeontologic data were used to determine hydrodynamic condition and palaeo-depth. Petrological,geophysical and geochemistry data were integrated to characterize the sedimentary facies. The studied interval is considered to represent an early Ordovician transgression to middle-late Ordovician regression sequence. Two sedimentary sub-facies including open platform and restricted platform were identified,which could be further subdivided into four microfacies: Platform shoal,inter-shoal,sub-tidal and inter-tidal microfacies. The platform shoal and sub-tidal microfacies show a continuous distributed thick succession which suggests strong hydrodynamics during deposition. The hydrodynamic condition also favored the development of earlier dissolution pores of the reservoir. Moreover,the quality of the reservoir is further enhanced through later weathering and leaching. Therefore,the platform shoal and sub-tidal microfacies are promising in developing high-quality karst reservoir zones,which have important implication for future oil and gas exploration.
Hua Xiaoli,Li Huiyong,Sun Xijia et al. The Paleozoic sedimentary microfacies and its control on karst reservoir in southwestern Bozhong sag,Bohai Bay Basin[J]. JOPC, 2017, 19(6): 1013-1022.
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