doi:10.16186/j.cnki.1673-9787.2020.4.5

Received:2019/11/14

Revised:2019/12/24

Published:2020/07/15

Calculation of core hempskin coefficient based on capillary pressure curve analysis ：A case study of Cretaceous in the Yaerxia oilfield

LI Guoli1, WU Wei1, DU Wenbo2, ZENG Ligang2, MU Mingyang2, WEI Haoyuan2, ZHAO Yanhong2

1.Research Institute of Logging Application of CNPC Logging Co. ， Ltd. ， Xi’an  710000 ， Shaanxi， China；2.Yumen Oilfield Company Exploration Development Research Institute， Jiuquan  735000 ， Gansu， China

Abstract:The hempskin effect results in an additional increase core in injection amount of mercury during the laboratory mercury injection measurement， which leads to a large oil saturation in the calculation which is related to the hemp coefficient. In order to analyze the influence of hemp skin effect on oil saturation in core analysis of Cretaceous glutenite reservoir in Yaerxia oilfield， the origin of hemp skin effect was expounded， the compute method of hempskin coefficient was analyzed and the results were given. According to this coefficient， the oil saturation of core was corrected， the saturation parameters before and after correction were compared with the theoretical values calculated by Archie formula， and the saturation after correction was qualitatively compared with the oil test conclusion. The results showed that the measured oil saturation of the core corrected by the hempskin coefficient was about 15% lower than the apparent oil saturation of the core， which was in good agreement with the saturation calculated by well logging. It could be seen that this method could provide technical reference for the study of core basic data in the research area to a certain extent， and provided reliable data for reservoir saturation evaluation and resource calculation.

Key words:capillary pressure curve;mercury injection test;hemp skin effect;saturation;hemp skin coefficient;Yaerxia oilfield;Cretaceous

基于毛管压力曲线分析的岩心麻皮系数计算_以鸭儿峡油田白垩系为例_李国利.pdf