恒速压汞法在致密储层孔隙结构表征中的适用性

发布时间：2018-01-09 18:12

本文关键词：恒速压汞法在致密储层孔隙结构表征中的适用性　出处：《断块油气田》2017年03期 　论文类型：期刊论文

【摘要】：在深入分析恒速压汞法原理的基础上,结合鄂尔多斯盆地延长组致密油岩心实验结果,研究了该方法在致密油孔隙结构表征中的适用性。结果表明:运用恒速压汞法能够区分孔隙和喉道,获得孔隙半径、喉道半径及孔喉半径比分布,可以更全面地表征孔隙结构并揭示其对渗流能力的影响;恒速压汞法以准静态进汞,能够消除润湿滞后效应,同时修正了高压下介质变形的影响,实验数据相比于高压压汞法更为准确。然而,受最高驱替压力的限制,恒速压汞法最大汞饱和度较低,无法表征半径小于0.12μm的孔喉。总体而言,恒速压汞法在表征致密油孔隙结构方面有一定的优势,但还需要结合其他方法才能表征致密油完整的孔隙结构。
[Abstract]:On the basis of deep analysis of the principle of constant velocity mercury injection method, combined with the experimental results of dense oil core of Yanchang formation in Ordos Basin. The applicability of this method in the characterization of pore structure of dense oil is studied. The results show that the distribution of pore radius, throat radius and pore-throat radius ratio can be obtained by using constant velocity mercury pressure method to distinguish pore and throat. The pore structure can be characterized more comprehensively and its influence on percolation capacity can be revealed. The hysteretic effect of wetting can be eliminated by using quasi-static mercury injection method, and the effect of medium deformation under high pressure is corrected. The experimental data is more accurate than that of high pressure mercury injection method. However, it is limited by the maximum displacement pressure. The maximum mercury saturation of constant speed mercury injection method is lower than 0.12 渭 m. In general, the constant speed mercury injection method has some advantages in characterizing the pore structure of dense oil. However, it is necessary to combine other methods to characterize the complete pore structure of dense oil.
【作者单位】：中国石油大学(北京)油气资源与工程国家重点实验室;中国石油大学(北京)石油工程教育部重点实验室;
【基金】：国家自然科学基金面上项目“基于数字岩心的致密油纳米—亚微米尺度储层特征及微观渗流规律研究”(51474222);国家自然科学基金青年基金项目“基于CT扫描及数字岩心的致密油多尺度渗吸机理研究”(51504265) 中国石油大学(北京)优秀博士学位论文资助基金项目“致密油储层微观孔隙结构及渗流规律研究”(2462016YXBS01)
【分类号】：P618.13
【正文快照】： 0引言致密油作为非常规油气中最为现实的部分受到了广泛的关注[1￣3]。致密油储层具有孔隙类型多样、孔喉半径差异大、纳米级孔隙大量发育的特点[4],这些特点对储层孔隙结构表征方法提出了新的要求。 Yuan和Swanson提出了恒速压汞法[5],运用该方法能够区分孔隙和喉道,并能

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