核磁共振测井在低阻油层评价中的应用——以准噶尔盆地阜东斜坡头屯河组为例

发布时间：2018-04-22 07:27

本文选题：准噶尔盆地 + 阜东斜坡　；参考：《新疆石油地质》2017年04期

【摘要】：为了解决常规测井方法难以有效识别低阻油层的难题,以准噶尔盆地阜东斜坡头屯河组为例,应用核磁共振测井技术划分和评价低阻油层。利用核磁共振、阳离子交换容量以及岩石薄片、粒度分析等资料研究低阻油层的成因,在此基础上运用核磁共振T_2谱定性识别油水层,计算孔隙度、渗透率以及含水饱和度。头屯河组储集层虽然泥质、黏土矿物含量整体上不高,但其特殊的黏土矿物组成能够产生较高的附加导电性和束缚水含量,造成了油层电阻率普遍小于6Ω·m,呈低电阻率的特征。根据核磁共振T_2谱形态,参照200 ms处有无谱峰可以有效划分出油层、含水油层、含油水层和水层。以3 ms作为T_2截止值,结合岩心实验测得的孔渗关系,可计算低阻油层孔隙度和渗透率,最后将核磁共振测井计算的阳离子交换容量带入W—S模型确定低阻油层含水饱和度。此方法对低阻油层的定性识别和定量评价结果与实验数据相吻合,在生产中具有较好的适用性。
[Abstract]:In order to solve the problem that it is difficult for conventional logging methods to identify low resistivity reservoirs effectively, taking the Toutunhe formation on the slope of Fudong in Junggar Basin as an example, nuclear magnetic resonance logging technology is used to divide and evaluate low resistivity reservoirs. On the basis of nuclear magnetic resonance (NMR), cation exchange capacity, rock sheet and particle size analysis, the formation of low resistivity oil layer is studied. On this basis, the oil and water layers are qualitatively identified by NMR T _ 2 spectrum, and porosity, permeability and water saturation are calculated. Although the muddy and clay mineral content in the reservoir of Toutunhe formation is not high on the whole, its special clay mineral composition can produce higher additional electrical conductivity and irreducible water content, resulting in the resistivity of the reservoir being generally less than 6 惟 m, which is characterized by low resistivity. According to the shape of NMR T _ 2 spectrum, the oil-bearing, water-bearing, oil-water-bearing and water-bearing layers can be effectively divided by referring to whether there are spectral peaks at 200 Ms. Taking 3ms as the cut-off value of T _ 2 and combining the porosity and permeability measured by core experiment, the porosity and permeability of low resistivity reservoir can be calculated. Finally, the cation exchange capacity calculated by nuclear magnetic resonance logging is brought into W-S model to determine the water saturation of low resistivity reservoir. The results of qualitative identification and quantitative evaluation of low resistivity reservoirs are in good agreement with experimental data and are suitable for production.
【作者单位】：中国石油新疆油田分公司勘探开发研究院;
【分类号】：P618.13;P631.81

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