Low-contrast reservoir identification method based on double formation water resistivity and its application

doi:10.3969/j.issn.1672-7703.2017.03.012

Abstract

Abstract: The apparent formation water resistivity (R_wa) is an important parameter of well logging interpretation. It is usually used, together with the true formation water resistivity (R_w), to identify the properties of reservoir fluids. For low-contrast continental reservoirs, however, the properties of formation water vary greatly, thus the wrong conclusion is often reached if the same R_w is used in the same area to identify oil reservoirs. In this paper, the formation water resistivity (R_{w_sp}) was calculated layer by layer on the basis of spontaneous potential curve. Then, R_{w_sp}, as the substitute for R_w, was used for comprehensive interpretation combined with R_wa. This method is quite capable of identifying lowcontrast oil layers in continental reservoirs with remarkable practical results.

Key words: low-contrast reservoir, apparent formation water resistivity, formation water resistivity based on spontaneous potential, amplitude of spontaneous potential curve, irreducible water resistivity, conductive ion concentration, mud property

CLC Number:

P631.322

Zhong Jibin, Shi Yujiang, Wang Changsheng, Zhang Shaohua, Li Weibing. Low-contrast reservoir identification method based on double formation water resistivity and its application[J]. China Petroleum Exploration, 2017, 22(3): 96-103.

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