鄂尔多斯盆地东南部马家沟组碳酸盐岩碳氧同位素特征及意义
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摘要
对鄂尔多斯盆地东南部马家沟组白云岩和灰岩的碳氧同位素进行测定。结果显示,样品的碳氧同位素值分布较为离散,二者的相关性仅为0.18,氧同位素平均值为-8.34‰;对锰、锶元素含量进行测定,计算ω(Mn)/ω(Sr)平均值为1.4,表明采集样品大部分受后期成岩蚀变影响小,可较好地代表原始地层的沉积特征。马五段、马六段样品的碳氧同位素值变化差异明显:马五段白云岩δ13C在-1.33‰~1.01‰(PDB),δ18O值在-9.58‰~-6.46‰(PDB),为中低负值;马六段灰岩δ13C在-6.75‰~0.92‰(PDB),δ18O值在-11.36‰~-7.33‰(PDB),马六段的碳氧同位素值较马五段离散,且发生了明显的负漂移。Z值与碳同位素值具有较高的相关性,而与氧同位素值相关性低,仅作为该区古盐度变化的相对参考值。碳氧同位素值与Z值所反映的环境信息表明,鄂尔多斯盆地东南部马家沟组马五期为海退期,海水循环性差,气候干旱炎热,处于蒸发环境,海水盐度较高。马六期形成的灰岩由于长期裸露地表,受到大气淡水淋滤作用的影响,角砾泥晶灰岩发育,其碳氧同位素值较低。
The carbon and oxygen isotopes of dolomite and limestone in Majiagou Formation in the southeast of Ordos Basin are studied. The result shows,the carbon and oxygen isotopes distributions are relatively discrete,their correlation is only 0. 18,and the average value of oxygen isotope is-8. 34‰. The contents of manganese and strontium were determined,and the average value of ω( Mn)/ω( Sr) was 1. 4. It shows that the samples collected are less affected by later diagenesis alteration,and can better represent the sedimentary characteristics of the original strata. The difference of carbon and oxygen isotope values between the fifth member( M5) and the sixth member( M6) of Majiagou Formation is obvious: δ13 C of the crystal dolomite of M5 isin-1. 33% ~ 1. 01%( PDB),δ ~(18)O values in-9. 58% ~-6. 46%( PDB),and it is medium low negative;δ13 C of the muddy limestone of M6 is in-6. 75‰ ~ 0. 92‰( PDB),δ ~(18)O values in-11. 36‰ ~-7. 33‰(PDB),and it is high negative value. The carbon and oxygen isotope values of M6 are more discreter than those of M5,and there is a clear negative drift. The Z value has a high correlation with the δ(13 CPDB) value,and a low correlation with the δ( ~(18)O_(PDB)) value,which is only a relative reference value of the paleosalinity change in this area. The environmental informations indicated by the carbon oxygen isotope value and the Z value indicate. The salinity of the M5 in the southeast of Ordos Basin is relatively high,and the salinity of the M6 is lower. The period of M5 was regressive period,and the circulation of sea water was poor,climate was dry and hot,it was evaporation environment and sea water was high salinity. The limestone formed in M6 is due to long exposure to the surface,influenced by atmospheric freshwater leaching,breccia micrite limestone develops and its carbon and oxygen isotope values are relatively low.
The carbon and oxygen isotopes of dolomite and limestone in Majiagou Formation in the southeast of Ordos Basin are studied. The result shows,the carbon and oxygen isotopes distributions are relatively discrete,their correlation is only 0. 18,and the average value of oxygen isotope is-8. 34‰. The contents of manganese and strontium were determined,and the average value of ω( Mn)/ω( Sr) was 1. 4. It shows that the samples collected are less affected by later diagenesis alteration,and can better represent the sedimentary characteristics of the original strata. The difference of carbon and oxygen isotope values between the fifth member( M5) and the sixth member( M6) of Majiagou Formation is obvious: δ13 C of the crystal dolomite of M5 isin-1. 33% ~ 1. 01%( PDB),δ ~(18)O values in-9. 58% ~-6. 46%( PDB),and it is medium low negative;δ13 C of the muddy limestone of M6 is in-6. 75‰ ~ 0. 92‰( PDB),δ ~(18)O values in-11. 36‰ ~-7. 33‰(PDB),and it is high negative value. The carbon and oxygen isotope values of M6 are more discreter than those of M5,and there is a clear negative drift. The Z value has a high correlation with the δ(13 CPDB) value,and a low correlation with the δ( ~(18)O_(PDB)) value,which is only a relative reference value of the paleosalinity change in this area. The environmental informations indicated by the carbon oxygen isotope value and the Z value indicate. The salinity of the M5 in the southeast of Ordos Basin is relatively high,and the salinity of the M6 is lower. The period of M5 was regressive period,and the circulation of sea water was poor,climate was dry and hot,it was evaporation environment and sea water was high salinity. The limestone formed in M6 is due to long exposure to the surface,influenced by atmospheric freshwater leaching,breccia micrite limestone develops and its carbon and oxygen isotope values are relatively low.
引文
[1]于兴河,王香增,王念喜,等.鄂尔多斯盆地东南部上古生界层序地层格架及含气砂体沉积演化特征[J].古地理学报,2017,19(6):935-954.
[2]屈红军,马强,高胜利,等.物源与沉积相对鄂尔多斯盆地东南部上古生界砂体展布的控制[J].沉积学报,2011,29(5):825-834.
[3]YANG Renchao,FAN Aiping,VAN LOON A J,et al.Depositional and diagenetic controls on sandstone reservoirs with low porosity and low permeability in the Eastern Sulige Gas Field,China[J].Acta Geologica Sinica,2014,88(5):1513-1534.
[4]杨华,付金华,刘新社,等.鄂尔多斯盆地上古生界致密气成藏条件与勘探开发[J].石油勘探与开发,2012,39(3):295-303.
[5]尚婷,曹红霞,郭艳琴,等.致密砂岩储层微观孔隙结构特征及物性影响因素分析[J].西北大学学报(自然科学版),2017,47(6):877-886.
[6]侯方浩,方少仙,赵敬松,等.鄂尔多斯盆地中奥陶统马家沟组沉积环境模式[J].海相油气地质,2002,7(1):38-46.
[7]侯方浩,方少仙,董兆雄,等.鄂尔多斯盆地中奥陶统马家沟组沉积环境与岩相发育特征[J].沉积学报,2003,21(1):106-112.
[8]史基安,邵毅,张顺存,等.鄂尔多斯盆地东部地区奥陶系马家沟组沉积环境与岩相古地理研究[J].天然气地球科学,2009,20(3):316-324.
[9]辛勇光,周进高,邓红婴.鄂尔多斯盆地南部下奥陶统马家沟组沉积特征[J].海相油气地质,2010,15(4):1-5.
[10]付金华,郑聪斌.鄂尔多斯盆地奥陶纪华北海和祁连海演变及岩相古地理特征[J].古地理学报,2001,3(4):25-34.
[11]王建民,王佳媛,沙建怀,等.鄂尔多斯盆地东部奥陶系风化壳岩溶古地貌特征及综合地质模型[J].吉林大学学报(地球科学版),2014,44(2):409-418.
[12]王高平,王震亮,赵雪娇,等.鄂尔多斯盆地延安地区奥陶系风化壳古地貌恢复[J].沉积学报,2013,31(4):563-570.
[13]吴海燕,曹红霞,强娟,等.延长探区中奥陶统马家沟组岩溶储层特征研究[J].西安科技大学学报,2013,33(2):167-172.
[14]YU Hongyan,LI Wei,QIN Xiaoyan,et al.Gas and water distribution of Ordovician Majiagou Formation in northwest of Ordos Basin,NW China[J].Petroleum Exploration and Development,2016,43(3):435-442.
[15]曹红霞,王念喜,强娟,等.鄂尔多斯盆地东南部下古生界碳酸盐岩天然气成藏条件[J].西安科技大学学报,2014,34(6):713-718.
[16]郭彦如,付金华,魏新善,等.鄂尔多斯盆地奥陶系碳酸盐岩成藏特征与模式[J].石油勘探与开发,2014,41(4):393-403.
[17]王震亮,魏丽,王香增,等.鄂尔多斯盆地延安地区下古生界天然气成藏过程和机理[J].石油学报,2016,37(21):99-110.
[18]杨华,王宝清,孙六一,等.鄂尔多斯盆地中奥陶统马家沟组碳酸盐岩碳、氧稳定同位素特征[J].天然气地球科学,2012,23(4):616-625.
[19]刘德良,孙先如,李振生,等.鄂尔多斯盆地奥陶系白云岩碳氧同位素分析[J].石油实验地质,2006,28(2):155-161.
[20]KEITH A L,WEBER J N.Carbon and oxygen isotopic composition of selected limestone and fossils[J].Geochim.et Cosmo-chim.Acta,1964,18:1787-1816.
[21]ZHANG Qingyu,LIANG Bin,QIN Fengrui,et al.Environmental and geochemical significance of carbon and oxygen isotopes of Ordovician carbonate paleokarst in Lunnan,Tarim Basin[J].Environ Earth Sci,2016,75:1-11.
[22]蔡观强,郭锋,刘显太,等.东营凹陷沙河街组沉积岩碳氧同位素组成的古环境记录[J].地球与环境,2009,37(4):347-354.
[23]LI Baofeng,SUN Donghuai,WANG Xin,et al.δ18O andδ13C records from a Cenozoic sedimentary sequence in the Lanzhou Basin,Northwestern China:Implications for palaeoenviron-mental and palaeoecological changes[J].Journal of Asian Earth Sciences,2016,125:22-36.
[24]陈强,张慧元,李文厚,等.鄂尔多斯奥陶系碳酸盐岩碳氧同位素特征及其意义[J].古地理学报,2012,14(1):117-124.
[25]郝松立,李文厚,刘建平,等.鄂尔多斯南缘奥陶系生物礁相碳酸盐岩碳氧同位素地球化学特征[J].地质科技情报,2011,30(2):52-56.
[26]黄思静,石和,毛晓冬,等.早古生代海相碳酸盐的成岩蚀变性及其对海水信息的保存性[J].成都理工大学学报(自然科学版),2003,30(1):9-18.
[27]严兆彬,郭福生,潘家永,等.碳酸盐岩C,O,Sr同位素组成在古气候、古海洋环境研究中的应用[J].地质找矿论丛,2005(20):53-65.
[28]王起琮,宫旋,肖玲.鄂尔多斯盆地下古生界石灰岩岩相及碳、氧稳定同位素特征[J].沉积学报,2013,31(4):580-589.
[29]左景勋,彭善池,朱学剑.扬子地台寒武系碳酸盐岩的碳同位素组成及地质意义[J].地球化学,2008,37(2):118-128.
[30]YANG Jie,ZENG Zuoxun,CAI Xiongfei,et al.Carbon and oxygen isotopes analyses for the Sinian carbonates in the Helan Mountain,North China[J].Chinese Science Bulletin,2013,58(32):3943-3955.
[31]罗顺社,汪凯明.河北宽城地区中元古代高于庄组碳酸盐岩碳氧同位素特征[J].地质学报,2010,84(4):492-499.
[32]QING H,VEIZER J.Oxygen and Carbon isotopic composition of Ordovician brachiopods:Implications for coeval seawater[J].Geochimica et Cosmochimica Acta,1994,58(20):4429-4442.
[2]屈红军,马强,高胜利,等.物源与沉积相对鄂尔多斯盆地东南部上古生界砂体展布的控制[J].沉积学报,2011,29(5):825-834.
[3]YANG Renchao,FAN Aiping,VAN LOON A J,et al.Depositional and diagenetic controls on sandstone reservoirs with low porosity and low permeability in the Eastern Sulige Gas Field,China[J].Acta Geologica Sinica,2014,88(5):1513-1534.
[4]杨华,付金华,刘新社,等.鄂尔多斯盆地上古生界致密气成藏条件与勘探开发[J].石油勘探与开发,2012,39(3):295-303.
[5]尚婷,曹红霞,郭艳琴,等.致密砂岩储层微观孔隙结构特征及物性影响因素分析[J].西北大学学报(自然科学版),2017,47(6):877-886.
[6]侯方浩,方少仙,赵敬松,等.鄂尔多斯盆地中奥陶统马家沟组沉积环境模式[J].海相油气地质,2002,7(1):38-46.
[7]侯方浩,方少仙,董兆雄,等.鄂尔多斯盆地中奥陶统马家沟组沉积环境与岩相发育特征[J].沉积学报,2003,21(1):106-112.
[8]史基安,邵毅,张顺存,等.鄂尔多斯盆地东部地区奥陶系马家沟组沉积环境与岩相古地理研究[J].天然气地球科学,2009,20(3):316-324.
[9]辛勇光,周进高,邓红婴.鄂尔多斯盆地南部下奥陶统马家沟组沉积特征[J].海相油气地质,2010,15(4):1-5.
[10]付金华,郑聪斌.鄂尔多斯盆地奥陶纪华北海和祁连海演变及岩相古地理特征[J].古地理学报,2001,3(4):25-34.
[11]王建民,王佳媛,沙建怀,等.鄂尔多斯盆地东部奥陶系风化壳岩溶古地貌特征及综合地质模型[J].吉林大学学报(地球科学版),2014,44(2):409-418.
[12]王高平,王震亮,赵雪娇,等.鄂尔多斯盆地延安地区奥陶系风化壳古地貌恢复[J].沉积学报,2013,31(4):563-570.
[13]吴海燕,曹红霞,强娟,等.延长探区中奥陶统马家沟组岩溶储层特征研究[J].西安科技大学学报,2013,33(2):167-172.
[14]YU Hongyan,LI Wei,QIN Xiaoyan,et al.Gas and water distribution of Ordovician Majiagou Formation in northwest of Ordos Basin,NW China[J].Petroleum Exploration and Development,2016,43(3):435-442.
[15]曹红霞,王念喜,强娟,等.鄂尔多斯盆地东南部下古生界碳酸盐岩天然气成藏条件[J].西安科技大学学报,2014,34(6):713-718.
[16]郭彦如,付金华,魏新善,等.鄂尔多斯盆地奥陶系碳酸盐岩成藏特征与模式[J].石油勘探与开发,2014,41(4):393-403.
[17]王震亮,魏丽,王香增,等.鄂尔多斯盆地延安地区下古生界天然气成藏过程和机理[J].石油学报,2016,37(21):99-110.
[18]杨华,王宝清,孙六一,等.鄂尔多斯盆地中奥陶统马家沟组碳酸盐岩碳、氧稳定同位素特征[J].天然气地球科学,2012,23(4):616-625.
[19]刘德良,孙先如,李振生,等.鄂尔多斯盆地奥陶系白云岩碳氧同位素分析[J].石油实验地质,2006,28(2):155-161.
[20]KEITH A L,WEBER J N.Carbon and oxygen isotopic composition of selected limestone and fossils[J].Geochim.et Cosmo-chim.Acta,1964,18:1787-1816.
[21]ZHANG Qingyu,LIANG Bin,QIN Fengrui,et al.Environmental and geochemical significance of carbon and oxygen isotopes of Ordovician carbonate paleokarst in Lunnan,Tarim Basin[J].Environ Earth Sci,2016,75:1-11.
[22]蔡观强,郭锋,刘显太,等.东营凹陷沙河街组沉积岩碳氧同位素组成的古环境记录[J].地球与环境,2009,37(4):347-354.
[23]LI Baofeng,SUN Donghuai,WANG Xin,et al.δ18O andδ13C records from a Cenozoic sedimentary sequence in the Lanzhou Basin,Northwestern China:Implications for palaeoenviron-mental and palaeoecological changes[J].Journal of Asian Earth Sciences,2016,125:22-36.
[24]陈强,张慧元,李文厚,等.鄂尔多斯奥陶系碳酸盐岩碳氧同位素特征及其意义[J].古地理学报,2012,14(1):117-124.
[25]郝松立,李文厚,刘建平,等.鄂尔多斯南缘奥陶系生物礁相碳酸盐岩碳氧同位素地球化学特征[J].地质科技情报,2011,30(2):52-56.
[26]黄思静,石和,毛晓冬,等.早古生代海相碳酸盐的成岩蚀变性及其对海水信息的保存性[J].成都理工大学学报(自然科学版),2003,30(1):9-18.
[27]严兆彬,郭福生,潘家永,等.碳酸盐岩C,O,Sr同位素组成在古气候、古海洋环境研究中的应用[J].地质找矿论丛,2005(20):53-65.
[28]王起琮,宫旋,肖玲.鄂尔多斯盆地下古生界石灰岩岩相及碳、氧稳定同位素特征[J].沉积学报,2013,31(4):580-589.
[29]左景勋,彭善池,朱学剑.扬子地台寒武系碳酸盐岩的碳同位素组成及地质意义[J].地球化学,2008,37(2):118-128.
[30]YANG Jie,ZENG Zuoxun,CAI Xiongfei,et al.Carbon and oxygen isotopes analyses for the Sinian carbonates in the Helan Mountain,North China[J].Chinese Science Bulletin,2013,58(32):3943-3955.
[31]罗顺社,汪凯明.河北宽城地区中元古代高于庄组碳酸盐岩碳氧同位素特征[J].地质学报,2010,84(4):492-499.
[32]QING H,VEIZER J.Oxygen and Carbon isotopic composition of Ordovician brachiopods:Implications for coeval seawater[J].Geochimica et Cosmochimica Acta,1994,58(20):4429-4442.