松辽盆地南部含片钠铝石砂岩储层岩石学特征及成因
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摘要
针对松辽盆地南部白垩系含片钠铝石砂岩储层,应用岩石学及同位素地球化学的原理和方法,对含片钠铝石砂岩储层的岩石类型、成岩共生序列和片钠铝石的产状及成因进行系统研究。研究结果显示,含片钠铝石砂岩储层的岩石类型以长石砂岩和长石岩屑砂岩为主,成岩共生序列依次为黏土矿物包壳—次生加大长石—次生加大石英、自生微晶石英、自生高岭石—方解石—油气充注—CO2充注—片钠铝石—铁白云石。松辽盆地南部片钠铝石的δ13CPDB为-0.342%~0.329%,δ18OPDB变化范围为-1.922%~-0.954%,与已证实形成于无机CO2背景、且同岩浆活动有成因联系的片钠铝石极为相近;而与片钠铝石平衡的CO2气的碳同位素值为-0.992%~-0.423%,与松辽盆地南部CO2气藏中CO2的碳同位素一致,说明松辽盆地南部片钠铝石与气藏中的CO2具有相同的碳来源,均为幔源-岩浆成因。
This paper studies the petrologic characteristics of the dawsonite- bearing sandstone reservoirs of the Cretaceous in southern Songliao Basin,,the diagenetic sequence of the dawsonite- bearing sandstone, and the occurrence and the origin of the dawsonite based on the principles and the methods of the petrology and the isotope geochemistry. The petrologic study shows that the dawsonite-bearing sandstones are mainly composed of the arkoses and the feldspathic litharenite. The diagenetic sequence is shown to be the clay coating cementation-secondary feldspar overgrowth-secondary quartz overgrowth, authigenic quartz, kaolinite-calcitehydrocarbon charging-CO2 charging-dawsonite-ankerite. The analysis of the carbon and oxygen isotope composition indicates that the dawsonite δ13CPDB values range from-0.342% to 0.329%, and δ18OPDB values range from-1.922% to-0.954%, as is similar to the proved dawsonite formed in the organic background and related to the magmatic activity. The calculated δ13CPDB values of CO2 gas in the isotope equilibrium with the dawsonite ranging from-0.992% to-0.423%, are consistent with the δ13CPDB values of the inorganic CO2 in the southern Songliao Basin. These values indicate that the CO2 that forms the dawsonite and that from the gas reservoir have the same source, which is the mantle-sourced origin.
This paper studies the petrologic characteristics of the dawsonite- bearing sandstone reservoirs of the Cretaceous in southern Songliao Basin,,the diagenetic sequence of the dawsonite- bearing sandstone, and the occurrence and the origin of the dawsonite based on the principles and the methods of the petrology and the isotope geochemistry. The petrologic study shows that the dawsonite-bearing sandstones are mainly composed of the arkoses and the feldspathic litharenite. The diagenetic sequence is shown to be the clay coating cementation-secondary feldspar overgrowth-secondary quartz overgrowth, authigenic quartz, kaolinite-calcitehydrocarbon charging-CO2 charging-dawsonite-ankerite. The analysis of the carbon and oxygen isotope composition indicates that the dawsonite δ13CPDB values range from-0.342% to 0.329%, and δ18OPDB values range from-1.922% to-0.954%, as is similar to the proved dawsonite formed in the organic background and related to the magmatic activity. The calculated δ13CPDB values of CO2 gas in the isotope equilibrium with the dawsonite ranging from-0.992% to-0.423%, are consistent with the δ13CPDB values of the inorganic CO2 in the southern Songliao Basin. These values indicate that the CO2 that forms the dawsonite and that from the gas reservoir have the same source, which is the mantle-sourced origin.
引文
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[8]Xu T F,Apps J A,Pruess K.Mineral sequestration of carbon dioxidein a sandstone-shale system[J].Chemical Geology,2005,217:295-318.
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[12]刘娜,刘立,杨会东,等.松辽盆地南部片钠铝石形成与碎屑长石的成因联系[J].吉林大学学报:地球科学版,2011,41(1):54-63.Liu Na,Liu Li,Yang Huidong,et al.Genetic relationship betweendawsonite and clastic feldspar in Southern part of Songliao Basin[J].Journal of Jilin University:Earth Science Edition,2011,41(1):54-63.
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[16]高玉巧,刘立,曲希玉,等.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.Gao Yuqiao,Liu Li,Qu Xiyu,et al.Petrologic characteristics ofdawsonite-bearing sandstones in Wuerxun Sag of Hailaer Basin andGudian CO2Gasfield in Songliao Basin[J].Journal of Palaeogeography,2008,10(2):111-123.
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[18]赵志魁,张金亮,赵占银.松辽盆地南部坳陷湖盆沉积相和储层研究[M].北京:石油工业出版社,2009.Zhao Zhikui,Zhang Jinliang,Zhao Zhanyin.The research of lakesedimentary and reservoir in the southern depression of Songliao Basin[M].Beijing:Petroleum Industry Press,2009.
[19]刘立,侯启军,刘娜,等.松辽盆地南部幔源CO2与油气充注时序——来自含片钠铝石砂岩的证据[J].石油与天然气地质,2011,32(54):873-881.Liu Li,Hou Qijun,Liu Na,et al.Charging time sequence of mantle CO2and hydrocarbon in Southern Songliao Basin:An evidence fromdawsonite-bearing sandstones[J].Oil&Gas Geology,2011,32(54):873-881.
[20]Ingersoll R V,Bullard T F,Ford R L,et al.The effects of grain sizeon detrital modes:A test of the Gazzi-Dickinson point-countingmethod[J].Journal of Sedimentary Petrology,1984,54:103-116.
[21]Worden R H,Burley S D.Sandstone diagenesis:the evolution of sandto stone[C]//Burley S D,Worden R H.Sandstone Diagenesis:Recentand Ancient.[s.l.]:Blackwell Publish,2003:1-44.
[22]邹才能,陶士振,张有瑜.松辽南部岩性地层油气藏成藏年代研究及其勘探意义[J].科学通报,2007,52(19):2319-2329.Zou Caineng,Tao Shizhen,Zhang Youyu.Research on accumulationperiod and exploration significance of lithostratigraphic reservoirs insouth Songliao Basin[J].Chinese Science Bulletin,2007,52(19):2319-2329.
[23]董林森,刘立,蒙启安,等.蒙古国塔木察格盆地塔南凹陷铜钵庙组火山碎屑岩中片钠铝石胶结物的成因[J].吉林大学学报:地球科学版,2011,41(2):421-431.Dong Linsen,Liu Li,Meng Qi'an,et al.Generation of dawsonitecement of pyroclastic rocks in Tongbomiao Formation in Tanan Sag ofTamtsag Basin in Mongolia[J].Journal of Jilin University:EarthScience Edition,2011,41(2):421-431.
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