致密砂岩孔喉大小表征及对储层物性的控制——以鄂尔多斯盆地陇东地区延长组为例

发布时间：2018-01-30 00:19

本文关键词： 致密砂岩孔喉大小延长组鄂尔多斯盆地陇东地区　出处：《石油学报》2017年08期 　论文类型：期刊论文

【摘要】：孔喉大小是评价储层质量的重要因素,而致密砂岩储层孔喉分布较强的非均质性使其表征难度较大。在分析目前孔喉表征方法的基础上,通过场发射扫描电镜、高压压汞和恒速压汞等实验,研究了鄂尔多斯盆地陇东地区延长组7段致密砂岩储层孔喉大小分布特征及其对储层物性的控制作用。结果表明:储层孔隙类型主要为剩余粒间孔、溶蚀孔、微孔和少量微裂缝;高压压汞表征孔喉的大小分布在0.014 8~40μm,大于1μm的孔喉分布较少;恒速压汞测试表明对于不同物性的样品其孔隙半径分布相对集中,主要分布在80~350μm;喉道半径则表现出较强的非均质性,分布在0.12~30μm;高压压汞和恒速压汞结合有效地表征了致密砂岩储层整个孔喉分布特征,孔径分布在0.0148~350μm。储层渗透率主要由比例较小的大孔喉(大于R_(50))所控制,对于渗透率大于0.1 mD的致密砂岩,其渗透率主要由微孔和中孔所控制,而小于0.1 mD的致密砂岩则主要由纳米孔和微孔所控制;此外,小孔喉的比例随着渗透率的减小而增加,虽然其对渗透率影响较小,但对储层储集性的影响却十分重要。
[Abstract]:Pore throat size is an important factor in evaluating reservoir quality, but the heterogeneity of pore throat distribution in tight sandstone reservoir makes it difficult to characterize. Based on the analysis of current pore throat characterization methods, field emission scanning electron microscopy (SEM) is used. High pressure mercury pressure and constant speed mercury pressure experiments. The pore throat size distribution characteristics of tight sandstone reservoir and its controlling effect on reservoir physical properties are studied in the seventh member of Yanchang formation in Longdong area, Ordos Basin. The results show that the pore types of reservoir are mainly residual intergranular pores and dissolved pores. Micropores and a small amount of microcracks; The size distribution of pore throat was 0.014 8 ~ 40 渭 m, but that of larger than 1 渭 m was less than that of high pressure mercury injection. The constant velocity mercury pressure test showed that the pore radius distribution of the samples with different physical properties was relatively concentrated, mainly distributed at 80 ~ 350 渭 m. The throat radius showed strong heterogeneity, distributed at 0.1230 渭 m. The combination of high pressure mercury injection and constant velocity mercury pressure can effectively characterize the pore throat distribution characteristics of tight sandstone reservoir. The pore size distribution is 0.0148 ~ 350 渭 m. The reservoir permeability is mainly controlled by a relatively small proportion of large pore throat (larger than RSP 50), and for tight sandstone with permeability greater than 0.1 MW. The permeability is mainly controlled by micropores and mesoporous sandstone, while the tight sandstone with less than 0.1 MD is mainly controlled by nano-pores and micropores. In addition, the ratio of pore throat increases with the decrease of permeability, although it has little effect on permeability, but the effect on reservoir reservoir is very important.
【作者单位】：中国石油大学地球科学学院油气资源与探测国家重点实验室;中国石油勘探开发研究院天然气地质研究所;陕西延长石油(集团)有限责任公司研究院;浙江大学海洋学院海洋地质与资源研究所;
【基金】：国家自然科学基金项目(No.41272157) 国家重大科技专项(2011ZX05007-003,2016ZX05006-006) 中国石油天然气股份有限公司重大科技专项(2011E-2602)资助
【分类号】：P618.13
【正文快照】： (1.College of Geosciences,China University of Petroleum;State Key Laboratory of Petroleum Resources and Prospecting,Beijing102249,China;2.Natural Gas Geological Department,PetroChina Research Institute of Petroleum Exploration andDevelopment,Hebei Langfa

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