Title: Diagenetic reservoir facies and pore space evolution pattern of low permeability reservoir
Abstract: Taking first member of lower Ganchaigou formation of Paleogene(E13) at Shaxi Oilfield as an example,the diagenesis,diagenetic sequences and stages were studied based on the analytic data of casting thin section,image analysis,scanning electron microscope,electron probe energy spectrometry,cathodoluminescence microscope,X-ray diffraction of clay minerals,vitrinite reflectivity of well core samples.The effects of low permeability reservoir diagenesis on the reservoir properties were analyzed.The characteristics and forming mechanism of each diagenetic reservoir facies were expatiated on,and the pore space types and evolution pattern were discussed.The results indicate that the forming mechanism of the low permeability in this area is the filling and cementation of autogenetic mineral during diagenesis.According to the diagenesis and characteristic pore space combination,the reservoir rocks of E13 can be divided into four types of diagenetic reservoir facies(DRF).DRF A is middle to strong dissolution of unstable ingredients to form secondary pores.DRF B is middle to strong compaction and middle cementation with residual intergranular pores.DRF C is strong carbonate cementation.DRF D is strong cementation of early anhydrite.The reservoir properties of type A diagenetic reservoir facies are the best,while that of type D are the worst and they are poor reservoirs or non-reservoirs.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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Cited By Count: 2
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