基于核磁实验的致密砂岩束缚水饱和度研究  

Study on Bound Water Saturation of Tight Sandstone Based on Nuclear Magnetic Experiment

作　　者：谭礼洪 蔡明[1,2] 蔡德洋 章成广[1,2] TAN Li-hong;CAI Ming;CAI De-yang;ZHANG Cheng-guang(College of Geophysics and Petroleum Resources,Yangtze University,Wuhan Hubei 430100,China;Key Laboratory of Oil and Gas Resources and Exploration Technology of Ministry of Education,Yangtze University,Wuhan Hubei 430100,China;Research Institute of Exploration and Development,PetroChina Tarim Oilfield Company,Korla Xinjiang 841000,China)

机构地区：[1]长江大学地球物理与石油资源学院,湖北武汉430100 [2]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [3]中石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《当代化工》2022年第5期1066-1070,共5页Contemporary Chemical Industry

基　　金：湖北省教育厅科学技术研究项目(项目编号:Q20211309);中国石油科技创新基金项目(项目编号:2019D-5007-0303)联合资助。

摘　　要：束缚水饱和度与储层产能及流体性质判别密切相关,获得准确的束缚水饱和度具有重要意义。针对致密砂岩核磁束缚水评价难题,选取塔里木盆地克深地区致密砂岩岩样,进行核磁共振实验,并建立了相应的束缚水饱和度计算模型。首先对部分岩样进行不同转速离心,通过与毛管压力计算公式计算的驱替力对比,确定了核磁共振离心的转速在11 000 r·min^(-1)时较为合适。利用面积比值法求取变T2截止值核磁束缚水饱和度,由此得到的核磁束缚水饱和度与压汞法束缚水饱和度比较接近,且与实际生产数据吻合,说明使用这两种方法都可以获得克深地区较为准确的束缚水饱和度。研究发现,核磁束缚水饱和度与综合物性参数等存在着密切联系,由此建立了基于核磁实验和常规测井资料的束缚水饱和度计算模型,提高了克深地区致密砂岩束缚水饱和度评价的精度。Bound water saturation is closely related to reservoir productivity and fluid property discrimination, so it is of great significance to obtain accurate bound water saturation. In order to evaluate the NMR bound water of tight sandstone reservoir, nuclear magnetic resonance experiment was conducted on tight sandstone samples from Keshen area, Tarim Basin, and the corresponding bound water saturation calculation model was established. Firstly, some rock samples were centrifuged at different speeds, and compared with the displacement force calculated by capillary pressure calculation formula, it was determined that the speed of NMR centrifugation at 11 000 r·min^(-1)was more appropriate. The area ratio method was used to obtain the NMR bound water saturation of the T_(2)cutoff value. The NMR bound water saturation obtained by this method was close to that obtained by mercury injection method, and was consistent with the actual production data, indicating that the two methods can be used to obtain more accurate bound water saturation in Keshen area. It was found that there was a close relationship between NMR bound water saturation and comprehensive physical property parameters, so a calculation model of bound water saturation based on NMR experiment and conventional logging data was established, which improved the evaluation accuracy of bound water saturation of tight sandstone in Keshen area.

关 键 词：致密砂岩 核磁共振 毛管压力 变T2截止值 

分 类 号：TE132[石油与天然气工程—油气勘探]