Abstract

GUANGFENG, Liu et al. Experimental study of petrophysical properties of a tight formation by considering the clay minerals and flow sensitivities. Earth Sci. Res. J. [online]. 2016, vol.20, n.2, pp.1-6. ISSN 1794-6190.  https://doi.org/10.15446/esrj.v20n2.54508.

Quantitative X-ray diffraction analysis of rock, X-ray diffraction analysis of clay minerals types and components, Field Emission Scanning Electron Microscope (FESEM) and sensitivity flow experiments methods were used to research the effects of clay minerals on the porosity and permeability of Ordos Basin's tight Chang 7 reservoir (Zhenbei area). These methods were also used to analyze the type, degree, and factors affecting reservoir sensitivity. The research showed that the reservoir possessed poor water, salt, and alkali sensitivity, poor to strong acid sensitivity and none to poor velocity sensitivity. Acid sensitivity among them had comparatively large differences, mainly because acid sensitivity was not only affected by chlorite but also by components of carbonate minerals. Stress sensitivity experiment results showed that the maximum degree of permeability damage in the rocks of this reservoir was median to very strong; irreversible damage level was weak to strong. Consequently, the experimental studies are favorable to not only determine the factor dominating the petrophysical properties of the tight formation, but also to optimize the follow-up development strategies, e.g. injection schedule and hydraulic fracturing implement.

Keywords : Analysis of clay minerals; porosity; permeability; sensitivity experiments; formation damage.

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