Paleoproductivity conditions of lower member of Cambrian Xiaoerbulak Formation in Kalpin thrust belt, Tarim Basin
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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。
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.
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Key words:
- Kalpin thrust belt /
- Cambrian Xiaoerbulak Formation /
- paleoproductivity
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图 1 柯坪冲断带区、带划分图(修改自李曰俊等,1999)和剖面位置
Figure 1.
表 1 肖尔布拉克剖面寒武系肖尔布拉克组下段元素含量(10-6)统计
Table 1. Statistics of paleo-productivity element values of lower member of Cambrian Xiaoerbulak Formation in Xiaoerbulak outcrop(10-6)
表 2 苏盖特布拉克剖面寒武系肖尔布拉克组下段元素含量(10-6)统计
Table 2. Statistics of paleo-productivity element values of lower member of Cambrian Xiaoerbulak Formation in Sugaitebulak outcrop(10-6)
表 3 沉积环境判识指标
Table 3. Identifying indices of depositional environment
表 4 干酪根碳同位素和沥青反射率测定结果
Table 4. Results of carbon isotope of kerogen and vitrinite-like reflectance
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