超低渗透储层孔隙结构对渗流特征的影响

发布时间：2018-01-12 06:26

本文关键词：超低渗透储层孔隙结构对渗流特征的影响　出处：《地质科技情报》2017年03期 　论文类型：期刊论文

【摘要】：为认识特低渗透储层成岩相分布以及微观渗流特性,尤其是孔隙结构对岩石渗流能力的控制作用,以合水地区长6层为研究对象,利用油水相渗、真实砂岩微观水驱油、核磁共振等实验,分析了不同成岩相储层的渗流特征,并结合恒速压汞、高压压汞实验测试结果及产油能力,探讨了不同成岩相孔隙结构与渗流规律的内在联系。结果表明,储层岩石孔隙中的油能否被驱出主要取决于连通孔隙的喉道参数,优势成岩相储层孔喉半径及有效喉道体积大,流体易于流动,驱油效率高;孔喉半径比大、孔喉分布范围窄、孔隙结构非均质性强是不利成岩相储层渗流能力差和驱油效率低的主要原因。
[Abstract]:In order to understand the diagenetic facies distribution and microscopic percolation characteristics of ultra-low permeability reservoirs, especially the controlling effect of pore structure on rock percolation ability, taking Chang6 layers in Heshui area as the research object, oil and water facies infiltration is used. The seepage characteristics of different diagenetic reservoirs are analyzed by microscopic water flooding and nuclear magnetic resonance (NMR) experiments of true sandstone, and combined with the test results of constant velocity mercury injection and high pressure mercury injection, and the oil production ability. The internal relationship between pore structure of different diagenetic facies and percolation law is discussed. The results show that whether the oil in the pore of reservoir rock can be driven out mainly depends on the throat parameters of the connected pores. The pore throat radius and effective throat volume of the dominant diagenetic facies reservoir are large, the fluid is easy to flow and the oil displacement efficiency is high; The main reasons for poor percolation ability and oil displacement efficiency of unfavorable diagenetic reservoirs are large radius ratio of pore throat narrow distribution range of pore throat and strong heterogeneity of pore structure.
【作者单位】：中石油长庆油田分公司第六采油厂;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(2011ZX05044) 陕西省科技统筹创新工程(2011KTZB01-04-01)
【分类号】：TE312
【正文快照】： 低渗透油藏开发过程中,流体渗流规律直接影响着油气产能分布,储层的物性状况是影响流体渗流的首要因素,而渗透率则是喉道对孔隙连通情况的宏观表现,即微观孔隙结构是造成储层物性差异的主要内因[1-2],但有关孔隙结构与渗流规律间内在联系的研究较为薄弱。合水地区长63层为半深

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