Study on Oil-Water Saturation Correction from Sealed Core Wells
详细信息
- 责任者：Tan Fengqi (College of Geophysics and Information Engineering ; China University of Petroleum ; Beijing 102249 ; China) ; Yang Changchun
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(3)
- 页码：p.592-598
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
The analysis of oil-water saturation from sealed core wells is important data for evaluation of oil-bearing property of reservoirs.However,the oil-water saturation values from core measuring in laboratory usually deviate from true situation of original formation condition,so these data must be corrected before using.In this paper,the Kexia Group reservoir of First-Middle block in Karamay oilfield is selected as the study object.Firstly,based on the theoretical mode of oil-water saturation the relationship between oil-water saturation under original formation condition and oil-water saturation of sealed core analysis are studied according to the concept of oil-water remaining rate,and then the linear relationship of oil-water saturation values of sealed core analysis and oil-water remaining rate are determined.Based on the slope and intercept of above linear relationship the oil and water loss percentage in total loss of oil-water saturation are respectively established by use of mathematical statistics and mathematical processing methods.Finally,the saturation data can be effectively corrected by oil and water loss percentage.The above-mentioned method is applied to oil-water saturation correction in Kexia Group reservoir and achieves good application results.The using of corrected saturation data greatly improves correlation between core oil-bearing and reservoir electricity and corrected data can better reflect the oil-bearing situation of original formation,then provides accurate basic data for the saturation formula determination and remaining oil evaluation.