Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (6): 106-110.doi: 10.3969/j.issn.1673-8926.2014.06.017

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Using J-function method to calculate saturation of carbonate reservoirs

SIMA Liqiang1， LI Qing1， YANG Yi 1，2， CHEN Qiang 1，3   

  1. 1. School of Geoscience and Technology ， Southwest Petroleum University ， Chengdu 610500 ， China ； 2. Zhanjiang Branch ， CNOOC ， Zhanjiang 524057 ， Guangdong ， China ； 3. PetroChina Tarim Oilfield Company ， Kolar 841000 ， Xinjiang ， China ）
  • Online:2014-11-20 Published:2014-11-20

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Abstract:

Calculating the initial water saturation of heterogeneous carbonate reservoirs is always a challenge to log interpretation, especially under the condition of lack of data such as sealed core which can directly determine the water saturation. Taking an oilfield in the Middle East as an example, according to the data of capillary pressure curve, physical properties analysis and RFT test, this paper discussed J-function method that uses capillary pressure curve to calculate initial water saturation of heterogeneous carbonate reservoirs. The water saturation calculated by this method agrees quite well with that interpreted by relative permeability experiment data and oil test results. This study provides a reasonable and reliable method to ensure water saturation of heterogeneous carbonate with no water saturation of cores.

Key words:  gas cap and bottomwater, horizontal well , critical rate , elliptical flow , familyofthe rectangles

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