天然气地球科学

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鄂尔多斯盆地差异抬升对长7页岩孔隙的影响——以东南部甘泉地区和南部渭北隆起地区为例

王香增,张丽霞,姜呈馥,尹锦涛,高潮,孙建博,尹娜,薛莲花   

  1. 1.陕西延长石油(集团)有限责任公司,陕西 西安 710075;
    2.陕西省页岩气勘探开发工程技术研究中心/陕西省陆相页岩气成藏与开发重点实验室,陕西 西安 710075;
    3.陕西延长石油(集团)有限责任公司研究院,陕西 西安 710075;
    4.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;
    5.中国科学院大学,北京 100049
  • 收稿日期:2018-01-22 修回日期:2018-02-08 出版日期:2018-05-10 发布日期:2018-05-10
  • 作者简介:王香增(1968-),男,河南滑县人,教授级高级工程师,博士,主要从事特低渗油气开采工程技术研究.E-mail:sxycpcwxz@126.com
  • 基金资助:

    国家科技重大专项(编号:2017ZX05039-001-005);陕西延长石油集团科技计划项目(编号:ycsy2017-ky-A-20)联合资助.

The effect of differential uplift on pore development of Chang 7 shale in Ordos Basin:Case studies of Ganquan area and Weibei uplift area

Wang Xiang-zeng,Zhang Li-xia,Jiang Cheng-fu,Yin Jin-tao,Gao Chao,Sun Jian-bo,Yin Na,Xue Lian-hua   

  1. 1.Shaanxi Yanchang Petroleum (Group) Co.,Ltd.,Xi’an 710075,China;
    2.Shaanxi Province Engineering Technology Research Center of  Shale Gas Exploration and Development/
    Shaanxi Province Key Laboratory of Lacustrine Shale Gas  Accumulation and Development,Xi’an 710075,China;
    3.Research Institute of Shaanxi Yanchang Petroleum (Group) Co.,Ltd.,Xi’an 710075,China;
    4.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum ResourcesResearch,Institute of Geology and Geophysics,Chinese Academy of sciences,Lanzhou 730000,China;
    5.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2018-01-22 Revised:2018-02-08 Online:2018-05-10 Published:2018-05-10

摘要:

为对比研究差异抬升对鄂尔多斯盆地延长组长7页岩孔隙的影响,分别选取了甘泉地区G127井和渭北隆起YW1井(浅地表)2组埋深相差较大的长73典型页岩样品,通过脉冲衰减渗透率测量、覆压孔隙度测量、氮气吸附实验及氩离子抛光—扫描电镜成像分析等方法对样品孔隙特征进行表征。结果表明:页岩储层孔隙均主要为纳米级,孔隙类型主要有粒间孔、粒内孔、微裂缝及少量有机质孔。其中,G127井有机质孔较发育,主要由于该区页岩所达最大埋深较深,样品热演化程度较高;而YW1井页岩裂缝较发育,这与盆地南部经历了强烈的构造抬升运动有关,致使YW1井页岩样品渗透率(1.13~4.24×10-3μm2普遍高于G127井渗透率(0.013 5~0.663 0)×10-3μm2。2组页岩中小于10nm微孔和中孔提供了主要的比表面积,大于10nm的中孔和大孔对孔隙体积贡献较大,其中G127井页岩平均孔径及孔径峰值均较YW1井页岩小,这与其埋深较深导致压实作用更强有关。

关键词: 页岩, 差异抬升, 孔隙特征, 低温氮气吸附, 鄂尔多斯盆地

Abstract:

To study the micro pore characteristics of Chang 7 shale in Ordos Basin,we selects two groups of different depths of Chang 7 shale samples from Well G127 (smaller uplift) and Well  YW1 (larger uplift),using Pulse attenuation permeability measurement,overburden pressure measurement,nitrogen adsorption experiment and Argon ion polishing scanning electron microscopy image analysis to characterize the pore.The results show that the pore size of shale reservoir is mainly nanoscale,and the main pore types are intergranular pore,intragranular pore,micro-fracture and a small amount of organic hole,of which organic hole is relatively well developed,which is related to the small amplitude of the uplift and the deeper burial depth of the shale.Meanwhile the fractures of Well YW1 shale which experienced strong tectonic uplift are more developed,so that the permeability of Well YW1 shale sample is generally higher than that of Well G127;Shale pore size distribution is complex,the pore shape is mainly composed of parallel plates,slit pores and ink bottle holes,which are open at both ends.Less than 10nm micropores and mesopores provide the main specific surface area.Mesopores and macropores larger than 10nm contribute greatly to pore volume.Based on the comparative study of uplifting effect on shale pore,this paper will provide reference for the exploration of shale gas and the delineation of favorable blocks in Ordos Basin.

Key words: Shale, Differential uplift, Pore characteristics, Low temperature nitrogen adsorption, Ordos Basin

中图分类号: 

  • TE122.2


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