文档摘要:在岩心观察和岩石薄片鉴定基础上,对川中地区茅一段眼皮-眼球灰岩岩心样品进行常量元素、微量元素、碳氧同位素及稀土元素测试分析,探讨了眼皮、眼球灰岩2种岩相地球化学特征及其古环境意义.研究结果表明:1)眼皮灰岩泥质质量分数为10%~45%,而眼球灰岩小于10%.2)眼皮、眼球灰岩δ13CPDB平均值分别为4.38‰,3.84‰,818OPDB平均值分别为-5.39‰,-6.00‰,总稀土元素质量分数平均值分别为10.54,3.43μg/g;眼皮、眼球灰岩均呈Ce负异常、Eu正异常特征,且眼球灰岩异常程度更高.3)眼皮、眼球灰岩不同常量氧化物之间的质量分数相关性明显,眼皮灰岩相关系数为0.52-0.95(平均值0.69),而眼球灰岩为0.91~0.99(平均值0.96).4)眼皮灰岩微量元素、总稀土元素及陆源元素质量分数均显著高于眼球灰岩,反映2种岩相原始沉积物组成存在差异,眼皮灰岩陆源物质输入更高.5)眼皮、眼球灰岩均沉积于干热气候下的高盐度海水缺氧环境,平均古水深相近,平均古水温分别为19.9,22.5℃;眼球灰岩沉积时期气候更炎热,古气候周期性变化是造成原始沉积物组成差异的主要因素.研究成果对深化四川盆地茅一段眼皮-眼球灰岩成因认识具有重要意义.
Abstract:Basedoncoreobservationandrockthinsectionidentification,coresamplesofeyelid-eyeballlimestonesinthefirstMemberofMaokouFormationareselectedformajorelements,traceelements,carbonandoxygenisotopesandrareearthelement(REE)tests,andthegeochemicalcharacteristicsandtheirpaleoenvironmentalsignificanceoftwolithofacies,eyelidandeyeballlimestonesincentralSichuanBasinarediscussed.Itisfoundthat:(1)Themudmassfractionofeyelidlimestonerangesfrom10%to45%,andthatoftheeyeballlimestoneislessthan10%.(2)Theaveragevaluesofδ13CPDBofeyelidandeyeballlimestonesare4.38‰and3.84‰respectively,theaveragevaluesofδ18OPDBare-5.39‰and-6.00‰respectively,andtheaverageoftotalw(REE)are10.54and3.43μg/grespectively;CenegativeanomalyandEupositiveanomalyarefoundinbotheyelidandeyeballlimestones,andtheanomalydegreeofeyeballlimestoneishigher.(3)Themassfractionsofdifferentmajoroxygenatedcompoundsaresignificantlycorrelatedwitheachother.Thecorrelationcoefficientofeyelidlimestonerangesfrom0.52to0.95(meanvalueis0.69)andthatofeyeballlimestonerangesfrom0.91to0.99(meanvalueis0.96).(4)Themassfractionoftraceelements,w(REE)andterrigenouselementsofeyelidlimestonearesignificantlyhigherthanthoseofeyeballlimestone,reflectingdifferencesoforiginalsedimentarymaterialsbetweenthetwolithofaciesandthehigherinputofterrigenousmaterialineyelidlimestone.(5)Botheyelidlimestoneandeyeballlimestoneweredepositedinananoxicenvironmentofhighsalinityseawaterunderdryandhotclimate,withsimilaraveragepaleowaterdepth,andaveragepaleowatertemperaturesare19.9and22.5℃respectively.Theclimatewashotterduringtheeyeballlimestonesedimentaryperiod,andtheperiodicchangeofpaleoclimatewasthemainfactorofthedifferenceinoriginalsedimentarymaterial.Theseresearchresultsareofgreatsignificancetotheunderstandingoftheunderstandingofeyelid-eyeballlimestonegenesisinthefirstMemberofMaokouFormationinSichuanBasin.
作者:赵威 邵红梅 洪淑新 焦玉国 白雪晶 刘云苗 葛志丹Author:ZHAOWei SHAOHongmei HONGShuxin JIAOYuguo BAIXuejing LIUYunmiao GEZhidan
作者单位:中国石油天然气集团有限公司碳酸盐岩储层重点实验室大庆油田研究分室,黑龙江大庆163000;中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163000
刊名:断块油气田 ISTICPKU
Journal:Fault-BlockOilandGasField
年,卷(期):2024, 31(3)
分类号:TE122.2P618.13
关键词:眼皮-眼球灰岩 地球化学 古环境 茅一段 川中地区 四川盆地
Keywords:eyelid-eyeballlimestone geochemistry paleoenvironment thefirstMemberofMaokouFormation centralSichuanBasin SichuanBasin
机标分类号:P532P618TE15
在线出版日期:2024年6月6日
基金项目:眼皮-眼球灰岩地球化学特征及其古环境意义[
期刊论文] 断块油气田--2024, 31(3)赵威 邵红梅 洪淑新 焦玉国 白雪晶 刘云苗 葛志丹在岩心观察和岩石薄片鉴定基础上,对川中地区茅一段眼皮-眼球灰岩岩心样品进行常量元素、微量元素、碳氧同位素及稀土元素测试分析,探讨了眼皮、眼球灰岩2种岩相地球化学特征及其古环境意义.研究结果表明:1)眼皮灰岩泥质质...参考文献和引证文献
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关键词:眼皮-眼球灰岩,地球化学,古环境,茅一段,川中地区,四川盆地,
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