天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地姬塬地区长6段致密砂岩中黏土矿物对储层物性的影响

李阳1,2,李树同1,牟炜卫1,2,闫灿灿1,2   

  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
  • 收稿日期:2017-04-25 修回日期:2017-06-16 出版日期:2017-07-10 发布日期:2017-07-10
  • 通讯作者: 李树同(1979-),男,甘肃会宁人,副研究员,博士,主要从事沉积学及油气地质学研究. E-mail:lishutong1979@163.com.
  • 作者简介:李阳(1991-),男,湖北孝感人,硕士研究生,主要从事油气储层地质学研究. E-mail:1354015695@qq.com.
  • 基金资助:

    中国科学院兰州油气资源研究中心“十三五”创新基金(编号:135CCJJ20160510);中国科学院创新促进会会员人才计划项目(编号:Y410ST1LST)联合资助.

Influences of clay minerals on physical properties of Chang 6 tight sandstone reservoir in Jiyuan area,Ordos Basin

Li Yang1,2,Li Shu-tong1,Mou Wei-wei1,2,Yan Can-can1,2   

  1. 1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2017-04-25 Revised:2017-06-16 Online:2017-07-10 Published:2017-07-10

摘要:

黏土矿物在鄂尔多斯盆地姬塬地区长6段各小层中均有分布,是该区致密砂岩储层中主要的填隙物,对储层物性有重要的影响。利用铸体薄片、压汞、扫描电镜(SEM)、X-射线衍射(XRD)等实验测试技术,分析储层岩石学特征认为,长6段是以长石岩屑砂岩和岩屑长石砂岩为主的低孔低渗的致密储层,其平均孔隙度为7.78%~9.13%,平均渗透率为(0.20~ 0.34)×10-3μm2。重点分析黏土矿物与储层物性之间的关系认为,高岭石和绿泥石是长6储层中主要的黏土矿物,对储层物性的影响较为复杂。少量的高岭石和绿泥石往往预示着储层孔隙度较好,而过量的高岭石(绝对含量>7%)和绿泥石(绝对含量>10%)则会大大降低储层的孔隙度。通过计算,长6储层原始孔隙度为41.13%~42.04%,高岭石充填导致砂岩孔隙度降低4.52%~4.78%,其损失率为10.74%~11.38%;绿泥石对长6段砂岩孔隙度的影响仅次于高岭石,导致孔隙度降低4.12%~4.70%,其损失率为9.81%~11.18%。自生高岭石对砂岩渗透率有一定的建设性作用,而绿泥石则导致砂岩渗透率降低。长6储层中伊利石含量较高岭石和绿泥石含量低,但由于其主要以丝缕状呈搭桥式充填孔隙,导致孔隙度和渗透率均有所降低,其孔隙度降低1.33%~2.08%,损失率为3.17%~4.94%。因此,在姬塬地区长6段致密储层中,黏土矿物对孔隙度的影响程度为:高岭石>绿泥石>伊利石。

关键词: 黏土矿物, 致密砂岩, 储层物性, 孔隙度, 渗透率, 长6储层, 姬塬地区

Abstract:

Clay minerals are widely distributed in each layer of the Chang 6 reservoir in Jiyuan area,which is the main interstitial material in the tight sandstone,and plays an important role in controlling the physical properties.Based on the experimental techniques of casting sections,mercury injection,scanning electron microscopy(SEM) and X-ray diffraction(XRD),combined with the analysis of the basic petrological characteristics,it is concluded that Chang 6,mainly consisting of feldspar lithic sandstone and lithic feldspathic sandstone,is a set of tight sandstone reservoir with low porosity and permeability.The average porosity and average permeability are 7.78%-9.13%,(0.20-0.34)×10-3μm2,respectively.Focus on the analysis of the relationship between clay minerals and reservoir physical properties,kaolinite and chlorite are the most common clay minerals and have a complex influence on reservoir physical properties.A small amount of kaolinite and chlorite usually indicates good reservoir porosity,but excessive kaolinite(absolute content>7%) and chlorite(absolute content>10%) will greatly reduce the porosity of the reservoir.The original porosity of Chang 6 sandstone reservoir in Jiyuan area is from 41.13% to 42.04% by calculation.Kaolinite filling caused the decrease of porosity of 4.52%-4.78%,the loss rate is 10.74%-11.38%.The effect of chlorite on Chang 6 sandstone porosity after kaolinite,leading to the decrease of porosity of 4.12%-4.70%,the loss rate is 9.81%-11.18%.Authigenic kaolinite has a constructive effect on the permeability of sandstone,and chlorite plays a major role in reducing the permeability of sandstone.Although illite content is lower than that of kaolinite and chlorite,the porosity and permeability of the reservoir are reduced due to the silk thread forming a bridge type illite filling pores,which lead to the decrease of porosity of 1.33%-2.08%,and the loss rate is 3.17%-4.94%.Therefore,the influence of clay minerals on porosity of Chang 6 tight reservoir in Jiyaun area is as follows: kaolinite>chlorite>illite.

Key words: Clay minerals, Tight sandstones, Reservoir physical properties, Porosity, Permeability, Chang 6 reservoir, Jiyuan area

中图分类号: 

  • TE122.2

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