石油学报 ›› 2007, Vol. 28 ›› Issue (4): 62-67.DOI: 10.7623/syxb200704012

• 地质勘探 • 上一篇    下一篇

松辽盆地孤店二氧化碳气田片钠铝石的特征及成因

高玉巧1, 刘立1, 杨会东1,2, 尤丽1, 刘娜1   

  1. 1. 吉林大学地球科学学院 吉林长春130061;
    2. 中国石油吉林油田公司勘探开发研究院 吉林松原138001
  • 收稿日期:2006-05-14 修回日期:2007-02-28 出版日期:2007-07-25 发布日期:2010-05-21
  • 作者简介:高玉巧,女,1978年9月生,2001年毕业于吉林大学,现为吉林大学矿物学、岩石学、矿物学专业在读博士研究生.E-mail:gaoyuqiao1973@sina.com
  • 基金资助:
    国家自然科学基金项目“岩浆成因二氧化碳气藏中储集砂岩的热对流成岩作用(No.40372060)”和“松辽盆地南部含片钠铝石砂岩中的成岩成藏记录研究(No.40672074)”联合资助

Characteristics and origin of dawsonite in Gudian carbon dioxide gas field of Songliao Basin

Gao Yuqiao1, Liu Li1, Yang Huidong1,2, You Li1, Liu Na1   

  1. 1. College of Geosciences, Jilin University, Changchun 130061, China;
    2. Exploration and Development Research Institute, Petro China Jilin Oilfield Company, Songyuan 138001, China
  • Received:2006-05-14 Revised:2007-02-28 Online:2007-07-25 Published:2010-05-21

摘要: 松辽盆地孤店二氧化碳气田储集砂岩中含有大量片钠铝石,根据其特征可以查明注入CO2气形成的自生矿物与CO2成因之间的联系。利用偏光显微镜、扫描电镜、X-射线衍射分析仪和MAT251稳定同位素质谱仪,详细描述了片钠铝石的形貌、产状和成分,确定了含片钠铝石砂岩的成岩共生序列和形成片钠铝石的CO2的成因。注入CO2气前形成的自生矿物组合主要为次生加大石英、高岭石和伊利石,注入CO2气后形成的自生矿物组合主要为片钠铝石和铁白云石。其中,片钠铝石呈板柱状、束状、放射状、菊花状、杂乱毛发状集合体,主要作为胶结物产于碎屑岩碎屑颗粒间的孔隙中,少量交代长石、石英等碎屑。INCA能谱测试表明组成片钠铝石的主要元素为氧、钠、铝、碳。片钠铝石的δ13C值为-1.9‰~+0.3‰,与片钠铝石平衡的δ13CCO2为-8.7‰~-6.9‰,与孤店CO2气田中CO2气的δ13CCO2值(-9.76‰~-5.74‰)接近。由于含片钠铝石砂岩与CO2气的分布都受控于深大断裂和玄武岩,CO2气和形成片钠铝石的CO2绝大部分属于幔源-岩浆型。

关键词: 松辽盆地, 孤店二氧化碳气田, 片钠铝石, 成因

Abstract: The sandstone with abundant dawsonite can be used to study the genetic relationship between the authigenic minerals caused by injected CO2 gas and original CO2 in Gudian carbonate dioxide gas field of Songliao Basin.The morphology,occurrence and components of dawsonite were described,and the paragenetic sequence of sandstone and origin of CO2 forming dawsonite were investigated by polarization microscope,scanning electron microscope,X-ray diffraction and MAT251 stable isotope mass spectrometer.The authigenic minerals include secondary overgrowth quartz,kaolinite and illite before CO2 influx.After CO2 influx,the main cements include dawsonite and ankerite.Dawsonite in the shapes of foliated columnar,cluster,radial,chrysanthemum or random hair mainly filled in the intergranular pores as cements and a few replaced grains such as feldspar and quartz.The dawsonite determined by INCA energy spectrometer is mainly composed of oxygen,sodium,aluminum and carbon.The δ13C values of dawsonite ranged from -1.9‰ to +0.3‰.The calculated δ13C values of CO2 gas being in equilibrium with dawsonite ranged from -8.7‰ to -6.9‰ and was in coincidence with the δ13C values ranging from -9.76‰ to -5.74‰ of CO2 gas in Gudian carbonate dioxide gas field.According to the fact that both sandstone within dawsonite and CO2 in CO2 gas reservoir lie in the vicinity of deep fracture and basalt,two kinds of CO2 both from gas reservoir and forming dawsonite almost belong to mantle origin-magma type.

Key words: Songliao Basin, Gudian carbon dioxide gas field, dawsonite, origin mechanism

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