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引用本文:白忠凯,谢李,韩淼,吕修祥,孙智超,李清瑶,杨有星,张金虎. 塔里木盆地柯坪地区寒武系肖尔布拉克组下段古生产力研究[J]. 中国地质, 2018, 45(2): 227-236.
BAI Zhongkai,XIE Li,HAN Miao,LÜ Xiuxiang,SUN Zhichao,LI Qingyao,YANG Youxing,ZHANG Jinhu. Paleoproductivity conditions of lower member of Cambrian Xiaoerbulak Formation in Kalpin thrust belt, Tarim Basin[J]. Geology in China, 2018, 45(2): 227-236(in Chinese with English abstract).
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塔里木盆地柯坪地区寒武系肖尔布拉克组下段古生产力研究
白忠凯,谢李,韩淼,吕修祥,孙智超,李清瑶,杨有星,张金虎
作者单位
白忠凯 中国地质调查局油气资源调查中心, 北京 100083 
谢李 中国石油大学(北京)地球科学学院, 北京 102249;中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249 
韩淼 中国地质调查局油气资源调查中心, 北京 100083 
吕修祥 中国石油大学(北京)地球科学学院, 北京 102249;中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249 
孙智超 中国地质调查局油气资源调查中心, 北京 100083 
李清瑶 中国地质调查局油气资源调查中心, 北京 100083 
杨有星 中国地质调查局油气资源调查中心, 北京 100083 
张金虎 中国地质调查局油气资源调查中心, 北京 100083 
摘要:
基于塔里木盆地柯坪地区寒武系地质剖面观测和75个样品分析测试的基础上,研究了柯坪冲断带下寒武统肖尔布拉克组下段碳酸盐岩古生产力。利用Ti扣除样品中来自陆源部分而得出生源元素的含量,Baxs、Cuxs和Znxs三种营养元素测量和数据处理结果表明它们相对自生富集,具备一定的古生产力水平,个别层段值较高,有较高古生产力水平。发育光面具缘藻(Leiomarginata)、粒面具缘藻(Granomarginata)、网面球藻(Dictyotidium)等疑源类生烃母质,为有机质沉积和烃源岩发育提供了物质基础。Pr/Ph、V/(V+Ni)、U/Th比值和δCe值判定该区下寒武统肖尔布拉克组下段为还原沉积环境,为烃源岩有机质的赋存提供了有利条件。有机质类型为I-Ⅱ型,达到了高成熟阶段,具备生烃潜力。研究区寒武系下统肖尔布拉克组下段发育优质潜在烃源岩。
关键词:  柯坪冲断带  肖尔布拉克组  古生产力
DOI:10.12029/gc20180202
分类号:P618.13;P588.24+5
基金项目:中国地质调查局项目(DD20160169、12120115001801、12120115001901)资助。
Paleoproductivity conditions of lower member of Cambrian Xiaoerbulak Formation in Kalpin thrust belt, Tarim Basin
BAI Zhongkai,XIE Li,HAN Miao,LÜ Xiuxiang,SUN Zhichao,LI Qingyao,YANG Youxing,ZHANG Jinhu
Abstract:
Based on geological investigation of several outcrops, the analyses of 75 samples and the previous achievements, the authors studied the paleoproductivity conditions of lower member of Cambrian Xiaoerbulak Formation in Kalpin thrust belt. In order to get the reliable content of biogenic elements, the authors used the Ti element to deduce the terrigenous elemental content of Ba,Cu and Zn and obtain the corrected values of the biogenic elements Baxs, Cuxs and Znxs. According to the results, it can be concluded that the lower member of Cambrian Xiaoerbulake Formation has a high level of paleoproductivity. The values of the biogenic elements Baxs, Cuxs and Znxs of individual layers are higher, and this indicates that individual layers have higher paleoproductivity. The acritarchs microfossils such as Leiomarginata sp., Granomarginata squamacea Volkova, Dictyotidium priscum Kirjanov and Volkova and Lophosphaeridium sp. were found in the Cambrian Xiaoerbulak Formation, and all these factors provided a good material basis for the deposition of organic matter. The identifying indices such as Pr/Ph,V/(V+Ni), U/Th and δCe indicate that the lower member of Cambrian Xiaoerbulak Formation source rocks were developed under a favorable condition with an anaerobic sedimentary environment. The type of organic matter is Type I-Ⅱ, and the organic matter has the characteristics of high maturity stage and potential of hydrocarbon generation. In summary, the lower member of Cambrian Xiaoerbulak Formation can be regarded as the potential source rock.
Key words:  Kalpin thrust belt  Cambrian Xiaoerbulak Formation  paleoproductivity