收稿日期: 2015-05-11
修回日期: 2015-09-30
网络出版日期: 2016-02-10
基金资助
国家自然科学基金(编号:41404084);湖北省自然科学基金(编号:2013CFB396);长江大学青年人才项目(编号:2015CQR11)联合资助.
Comparative experimental study of the core irreducible water saturation of tight gas reservoir
Received date: 2015-05-11
Revised date: 2015-09-30
Online published: 2016-02-10
束缚水饱和度是进行储层油气评价、产能预测及储量计算的关键参数,现有的确定岩心束缚水饱和度的实验标准不适合于致密气储层岩样。选取大量具有代表性的致密砂岩岩样,进行了半渗透隔板、核磁共振及压汞实验测量,并对这3种实验确定束缚水饱和度的方法进行了对比研究。研究认为:选用阈压值为1.5MPa的隔板进行半渗透隔板毛细管压力曲线测量,并不能准确获取岩心束缚水饱和度,隔板阈压值需要达到3MPa;致密砂岩岩样在离心机上用0.690MPa离心力甩出的自由水并不充分,最佳离心力应为1.379MPa,结合核磁共振饱和T2谱与1.379MPa离心力下测量的离心T2谱可以有效地确定致密岩样的束缚水饱和度;半渗透隔板毛细管压力曲线与压汞毛细管压力曲线在形态上存在差异,压汞法采用毛细管压力为1.379MPa(转换为气—水系统)时所对应的束缚水饱和度更为可靠。
张冲,张超谟,张占松,秦瑞宝,余杰 . 致密气储层岩心束缚水饱和度实验对比[J]. 天然气地球科学, 2016 , 27(2) : 352 -358 . DOI: 10.11764/j.issn.16721926.2016.02.0352
The irreducible water saturation is the key parameter of oil and gas reservoir evaluation,productivity prediction and the calculation of reserves.The existent experimental standard of the core irreducible water saturation is not suitable for rock samples of tight gas reservoir.A large number of representative tight sandstone samples were selected for semi permeable diaphragm experiment,NMR experiment and mercury injection experiment.After making a comparative study of these three methods,some conclusions were made.If the plate whose pressure threshold value is 1.5MPa is selected to get the capillary pressure curves,the accurate core irreducible water saturation cannot be obtained.The appropriate pressure threshold value needs to reach 3MPa.The best centrifugal force for getting free water of the tight sandstone samples is 1.379MPa instead of 0.690MPa.Combing T2 distribution in 1.379MPa centrifugal force condition and T2 distribution of saturation NMR,the irreducible water saturation of tight rock samples can be effectively determined.The semipermeable plate capillary pressure curves are different with mercury injection capillary pressure curves in the shape of curve.When the capillary pressure is 1.379MPa,mercury intrusion method can get more reliable irreducible water saturation.The above research results have reference significance for the revision of the industry standard of petroleum and natural gas industry in China.
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