天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地东部上古生界致密气储层石英溶蚀及其机理探讨

田夏荷1,屈红军1,刘新社2,杨欢1,董文武1,陈雅晖1   

  1. 1.西北大学地质学系/大陆动力学国家重点实验室,陕西 西安 710069;
    2.中国石油长庆油田分公司,陕西 西安 710018
  • 收稿日期:2015-11-24 修回日期:2016-08-22 出版日期:2016-11-10 发布日期:2016-11-10
  • 通讯作者: 屈红军(1967-),男,陕西凤翔人,教授,博士,主要从事储层沉积学研究. E-mail:hongjun@nwu.cdu.cn.
  • 作者简介:田夏荷(1991-),女,陕西西安人,硕士研究生,主要从事储层沉积学研究. E-mail:txhmiao@sina.com.
  • 基金资助:
    国家自然科学基金重大项目(编号:41390451);国家自然科学基金面上项目(编号:41172101)联合资助.

Discussion on quartz dissolution and its mechanisms of the Upper Paleozoictight gas reservoirs in the eastern Ordos Basin

Tian Xia-he1,Qu Hong-jun1,Liu Xin-she2,Yang Huan1,Dong Wen-wu1,Chen Ya-hui1   

  1. 1.State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi’an 710069,China;
    2.Changqing Oilfield Company,PetroChina,Xi’an 710018,China
  • Received:2015-11-24 Revised:2016-08-22 Online:2016-11-10 Published:2016-11-10

摘要: 鄂尔多斯盆地东部上古生界致密气储层主要以岩屑石英砂岩和石英砂岩为主,总体石英含量较高,在镜下观察中经常发现该区上古生界储层发育石英溶蚀现象,因此分析该区石英溶蚀特征、探讨其形成机理对储层评价具有重要的意义。通过铸体薄片鉴定、扫描电镜及X-射线衍射分析等测试手段,对鄂尔多斯上古生界致密气储层石英溶蚀特征、成因机理进行了详细研究。石英溶蚀表现为石英颗粒及硅质胶结物溶蚀成港湾状、锯齿状,部分颗粒表面发育溶蚀坑,可分为石英颗粒边缘被溶蚀、石英次生加大边被溶蚀及石英颗粒部分或整体被溶蚀这3种型式;石英溶蚀表现出2种伴生胶结物特征:一种是多酸性黏土矿物高岭石的石英溶蚀;另一种为富伊利石的石英溶蚀。石英溶蚀机理有2种:一种是有机酸条件下酸性孔隙水及游离水中的Al3+对石英的溶蚀,主要伴生以高岭石为主的酸性黏土矿物,对高岭石含量较高的本溪组及山2段储层孔隙改善明显;另一种是偏碱性成岩环境下碱性孔隙水对石英的溶蚀,主要伴生以伊利石为主的偏碱性_中性黏土矿物,对伊利石大量发育的太原组储层孔隙改善明显。

关键词: 石英溶蚀, 溶蚀机理, 致密气储层, 上古生界, 鄂尔多斯盆地

Abstract: The Upper Paleozoic tight gas reservoirs in the eastern Ordos Basin are mainly composed of lithic quartz sandstones and quartz sandstones,with overall high quartz content.Quartz dissolution characteristics and its formation mechanism are studied via casting thin sections,scanning electron microscopy and X-ray diffraction analyzing test data in detail.Quartz dissolution manifest as quartz particles and siliceous cement dissolved into the harbor,serrated outlines,with corrosion pits in part of some particle surfaces.Quartz dissolution has mainly three patterns,including dissolution of the edge of the quartz grains,along quartz overgrowth boundary and in part of quartz particles or in the whole quartz particles.Associated cements characteristics of quartz dissolution has mainly two patterns,i.e.,one is more acidic kaolinite clay mineral associated and another is illite-rich associated.Quartz dissolution mechanisms mainly have two types,i.e.,one is acidic pore waters and Al3+ under an organic acidic background with dissolution of quartz,associated with kaolinite-based acidic clay minerals,which improved reservoirs pores of Benxi group and Shan 2 members,while the other is alkaline pore waters under alkaline diagenesis background with dissolution of quartz,mainly associated with illite-based alkaline or neutral clay minerals,which significantly improved reservoir pores of Taiyuan group.

Key words: Quartz dissolution, Dissolution mechanism, Tight gas reservoirs, The Upper Paleozoic, Ordos Basin

中图分类号: 

  • TE122.2

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