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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/13670

Title: Technical note: Petrophysical evaluation of low resistivity sandstone reservoirs
Authors: Hamada, G.M.,
Al-Awad, M.N.J.
Keywords: Clay; Crude petroleum; Electric conductivity of solids; Pyrites; Sandstone; Saturation (materials composition); Shale
Issue Date: 2000
Publisher: Canadian Institute of Mining
Citation: Journal of Canadian Petroleum Technology, 39 (7), pp. 7-14.
Abstract: There are many reasons for low resistivity pay zones. It is of crucial importance to know the origin of this phenomenon. The problem with these zones is that the resistivity data interpretation indicates high water saturation, but oil or even dry oil will be produced. This paper discusses the different reasons sandstone reservoirs can have low resistivity. Clean bearing sandstone has high resistivity, but when this rock contains shale, or heavy minerals such as pyrite, the resistivity can become low. This resistivity change depends on the nature, the volume of clay and heavy minerals. Pyrite shows a good electrical conductivity, that is usually comparable to or even higher than the conductivity of formation water, and can therefore have a larger effect than shale. Low resistivity pay zones are not necessarily shaly sand problems. In this study, different shaly sand models will be discussed, to propose a suitable shale sand model. Field examples were analysed using different shaly sand models. It has been found that the modified total shale sand model gives good results. In the case of low shale volumes, the normal saturation equation might give acceptable water saturation values.
URI: http://hdl.handle.net/123456789/13670
Appears in Collections:College of Engineering

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