Origin of Carbonate Cements Occurrence and Their Effects on Reservoir Quality of Buried Hill Reservoir in Mz Strata

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Summary Carbonate cement is a significant and widespread component in Mesozoic clastic resevoir of Bohai bay basin. Using rock slice, SEM image, X-ray diffraction, Ro data and advanced method of laser microsampling analysis of carbon and oxygen isotope, we have investigated the influence of carbonate content, occurrence, and forming periods on reservoir quality difference in CFD12-6 and QK17-9 block in Bohai bay basin. The results indicated that repeated deep burial condition and closure diagenetic environment exerts a control on tight carbonate cements forming in low-porosity and permeability reservoir of CFD12-6; while shallow burial depth, open diagenetic environment, and tectonic condition including dip angel strata and developed fractures exerts a control on diagenetic fluid migration and hydrocarbon charging in middle-porosity and permeability reservoir of QK17-9. Furthermore, diagenetic model of differential diagenesis is introduced for interpreting the phenomenon of the occurrence and effect of ferro-dolomite in eogenetic period in QK17-9.

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