天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地陇东地区延长组长7段致密储层水平向可动流体特征及其影响因素分析

郭睿良,陈小东,马晓峰,马静,[王琪],陈霖   

  1. 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃 兰州 730000;
    2.中国科学院大学,北京 100049;
    3.中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018;
    4.中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北 武汉 430074
  • 收稿日期:2018-03-26 修回日期:2018-04-10 出版日期:2018-05-10 发布日期:2018-05-10
  • 作者简介:郭睿良(1991-),男,陕西西安人,博士研究生,主要从事油气储层地质学研究
  • 基金资助:

    国家自然科学基金面上项目(编号:41772142);中国石油天然气股份有限公司重大科技专项“长庆油田5000万吨持续稳产关键技术研究与应用”项目(编号:2016E-05);中国科学院兰州油气资源研究中心“十三五”创新基金(编号:35CCJJ20160510;135CCJJ20160504);甘肃省油气资源研究重点实验室开放基金(编号:SZDKFJJ20160602)联合资助.


    E-mail:guoruiliang1991@163.com.

Analysis of the characteristics and its influencing factors of horizontal movable fluid in the Chang 7 tight reservoir in Longdong area,Ordos Basin

Guo Rui-liang,Chen Xiao-dong,Ma Xiao-feng,Ma Jing,Wang Qi,Chen Lin   

  1. (1.Key Laboratory of Petroleum Resources Research,Gausu Province/ Key Laboratory of Reasearch,
    Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Exploration & Development Research Institute of Changqing Oilfield Company,PetroChina,Xi’aan 710018,China;
    4.Key Lab of Tectonics and Petroleum Resource of Educational Ministry,China University of Geosciences,Wuhan 430074,China)
  • Received:2018-03-26 Revised:2018-04-10 Online:2018-05-10 Published:2018-05-10

摘要:

以离心实验与核磁共振实验为主,辅以铸体薄片分析、场发射电镜扫描、纳米级CT扫描、X-射线衍射黏土矿物分析以及常规压汞分析,对鄂尔多斯盆地陇东地区长7段致密储层GP41-65水平井的6块岩心样品(水平跨度44.48m)进行水平方向可动流体特征及其影响因素研究。结果表明:研究区长7段致密储层饱和模拟地层水状态下T2谱形态为左峰高于右峰的双峰态,对比离心后的T2谱可知可动流体主要分布于中大孔隙内;并且6个岩心样品的微小孔隙与中大孔隙的比例有明显差异;核磁共振实验结果显示可动流体T2截止值与储层孔隙度、渗透率相关性均较好,基于核磁共振实验原理可知T2截止值与可动流体孔喉半径下限具有对应关系;通过T2分布换算孔喉半径分布的方法,得出6个样品可动流体孔喉半径下限相差10.5倍,平均为0.62μm,可动流体分布特征与参数差异性表明长7段致密储层水平向非均质性较强;而储层孔喉半径分布、次生孔隙发育情况及孔喉连通程度、不同类型黏土矿物含量和赋存形态以及充填孔喉程度、微裂缝发育与充填程度是致密储层可动流体参数差异性较大的影响因素,其中长石溶蚀孔的发育和呈蜂窝状、搭桥状充填孔隙的伊利石的发育则为主控因素。

关键词: 致密储层, 核磁共振, T2谱, 可动流体, 延长组, 长7油层组, 陇东地区

Abstract:

The movable fluid distribution,evaluation and the controlling factors of 6 samples (horizontal span 44.48m) from Chang 7 tight oil reservoir of the horizontal well in Longdong area,Ordos Basin was analyzed mainly by using the centrifugal and NMR experiment,assisted with cast thin section,scanning electron microscopy,nano-scale CT scanning,X-diffraction clay mineral analysis and mercury injection.The results show that the T2 spectrum morphology of tight oil reservoir has double peaks with the left peak higher than the right one.The movable fluid is mainly distributed in the middle and large pores,and there is a significant difference in the proportion of the small pores and the large and medium pores.Both reservoir porosity and permeability have high relationship with the T2 cutoff.The lower limit of throat radius of movable fluid is determined by using transformation of NMR T2 distribution to pore throat radius distribution.The results show that the lower limit of throat radius of movable fluids of 6 samples differs 10.5 times,with an average of 0.62μm.The distribution characteristics and deviation of movable fluid parameters show that the horizontal heterogeneity of Chang 7 tight oil reservoir is high.The distribution of pore and throat,development degree of secondary porosity,connectivity between pore and throat,the content,the occurrence states,and the filling degree of clay mineral,development degree and filling degree of micro-fracture are the factors to cause deviation of movable fluid parameters,while development of feldspar dissolution pores and pores filled with honeycomb and bridging illite are the main controlling factor.

Key words: Tight reservoir, NMR, T 2 spectrum, Movable fluid, Yanchang Formation, Chang 7 section, Longdong area

中图分类号: 

  • TE122.1

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