Application of Capillary Pr essur e to Determination of Cut-off Pore-Throat Radius in Reservoirs

Xinjiang Petroleum Geology ›› 2006, Vol. 27 ›› Issue (1): 104-106.

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Application of Capillary Pr essur e to Determination of Cut-off Pore-Throat Radius in Reservoirs

WAN Wen-sheng^a, DU Jun-she^a, TONG Guo-zhang^b, ZOU Min^a, QIN Xu-sheng^c, TAN Wen-dong^a, NAN Hui^a

Xinjiang Oilfield Company, PetroChina: a. Zhundong Institute of Exploration and Development, Zhundong Production Plant; b. Zhundong Petroleum Technology Company Ltd; c. Cainan Oilfield, Fukang, Xinjiang 831511, China

Received:2005-03-23 Revised:2005-03-23 Published:2020-10-19

Abstract

Abstract: The logarithmic graph and the cumulative probability diagram for pore-throat radius vs mercury injection saturation are presented, in which the straight-line portion similar with the suspending line portion on cumulative grain-size probability curve means the difficult-to-flow and stagnation pore domains in reservoirs, from which the typical cut-off pore-throat radius is read directly and verified by the conventional pore-throat radius method and the modern nuclear magnetic resonance technique. In addition, the combination of capillary pressure curve and spectrum t₂ of nuclear magnetic resonance can help to directly determine the cut-off oil-bearing pore-throat radius.

Key words: capillary pressure curve, probability, nuclear magnetic resonance, pore-throat radius, limitation, cut-off value

CLC Number:

TE112.23

WAN Wen-sheng, DU Jun-she, TONG Guo-zhang, ZOU Min, QIN Xu-sheng, TAN Wen-dong, NAN Hui. Application of Capillary Pr essur e to Determination of Cut-off Pore-Throat Radius in Reservoirs[J]. Xinjiang Petroleum Geology, 2006, 27(1): 104-106.

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Application of Capillary Pr essur e to Determination of Cut-off Pore-Throat Radius in Reservoirs

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