| 海拉尔盆地乌尔逊凹陷与松辽盆地孤店CO2气田含片钠铝石砂岩的岩石学特征 |
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| 引用本文： | 高玉巧,刘立,曲希玉,刘娜.海拉尔盆地乌尔逊凹陷与松辽盆地孤店CO2气田含片钠铝石砂岩的岩石学特征[J].古地理学报,2008,10(2):111-123. |
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| 作者姓名： | 高玉巧 刘立 曲希玉 刘娜 |
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| 作者单位： | 1.内生金属矿床成矿机制研究国家重点实验室 南京大学地球科学系 江苏南京210093;2.吉林大学地球科学学院 吉林长春130061 |
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| 基金项目： | 本研究为国家自然科学基金"岩浆成因二氧化碳气藏中储集砂岩的热对流成岩作用"(编号: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"(编号:40672074)资助的成果 |
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| 摘 要： | 海拉尔盆地乌尔逊凹陷南屯组与松辽盆地孤店CO2气田泉头组发育大量含片钠铝石砂岩。通过偏光显微镜、扫描电镜、茜素红-S染色、X射线衍射、电子探针与INCA能谱分析等，对含片钠铝石砂岩的骨架碎屑组分、胶结物与自生矿物、成岩共生序列等岩石学特征进行了系统研究。研究表明，含片钠铝石砂岩的岩石类型为长石砂岩和岩屑长石砂岩，粒度以细粒、细-中粒为主，分选差-中等。砂岩中胶结物主要为次生加大石英、自生石英、片钠铝石、铁白云石和粘土矿物。其中，片钠铝石最高可达砂岩总体积的22％在砂岩中或以放射状、束状、菊花状、杂乱毛发状、毛球状、板状等集合体充填孔隙，或呈束状和板状交代长石和岩屑。电子探针与INCA能谱综合分析表明，片钠铝石主要由Na、Al、O、C等组成。在含片钠铝石砂岩中，成岩共生序列依次为粘土矿物包壳-次生加大石英、自生石英、自生高岭石-油气充注-CO2充注-片钠铝石-铁白云石。其中，CO2注入前形成的自生矿物组合主要为次生加大石英、自生石英和自生高岭石，CO2注入后形成的自生矿物组合主要为片钠铝石和铁白云石。
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| 关 键 词： | 海拉尔盆地 松辽盆地 含片钠铝石砂岩 片钠铝石 岩石学 |
| 文章编号： | 1671-1505(2008)02-0111-13 |
| 修稿时间： | 2007年8月8日 |
Petrologic characteristics of dawsonite-bearing sandstones in Wuerxun Sag of Hailaer Basin and Gudian CO2 Gasfield in Songliao Basin |
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| Gao Yuqiao Liu Li Qu Xiyu Liu Na State Key Laboratory for Mineral Deposit Research.Petrologic characteristics of dawsonite-bearing sandstones in Wuerxun Sag of Hailaer Basin and Gudian CO2 Gasfield in Songliao Basin[J].Journal of Palaeogeography,2008,10(2):111-123. |
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| Authors: | Gao Yuqiao Liu Li Qu Xiyu Liu Na State Key Laboratory for Mineral Deposit Research |
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| Institution: | 1.State Key Laboratory for Mineral Deposit Research，Department of Earth Sciences，;
Nanjing University，Nanjing210093，Jiangsu;2.College of Earth Sciences，Jilin University，Changchun130061，Jilin |
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| Abstract: | Both the Nantun Formation in the Wuerxun Sag of the Hailaer Basin and the Quantou Formation in the Gudian CO2 Gasfield in the southern Songliao Basin contain abundant dawsonite-bearing sandstones.The petrologic characteristics of these sandstones including the framework clastic composition,cements and authigenic minerals and diagenetic paragenesis succession are investigated through polarizering microscope,scanning electron microscope,alizarin red-staining,X-ray diffraction,electron probe and INCA energy spectrum analysis etc.The results show that these sandstones are fine-grained or fine-to-medium-grained,poorly to moderately sorted arkoses and lithic arkoses.The dominant cements are secondary quartz overgrowths,authigenic quartz,dawsonite,ankerite and clay minerals.The amount of dawsonite is higher(up to 22% of the total volume of the sandstones),either as cements,filling inter-grain pores as radial,bunchy,rosette,intricately trichoid,spheric and platy collectives,or as replacement of feldspar and lithic grains with bunchy and platy shapes.Dawsonite is mainly composed of elements such as Na,Al,O,and C according to electron probe and INCA energy spectrum analyses.The paragenetic sequence includes(1)clay mineral coatings;(2)secondary quartz overgrowths,authigenic quartz,authigenic kaolinite;(3)petroleum charging;(4)CO2 charging;(5)dawsonite;and(6)ankerite.The authigenic minerals formed before CO2 charging include secondary quartz overgrowths,authigenic quartz and authigenic kaolinite,while the main cements formed after CO2 charging are dawsonite and ankerite. |
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| Keywords: | Hailaer Basin Songliao Basin dawsonite-bearing sandstones dawsonite petrology |
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