桂中鹿寨地区鹿寨组下段地球化学特征及有机质富集因素
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摘要
研究广西中部鹿寨地区下石炭统鹿寨组下段海相富有机质泥岩的地球化学特征,探讨其形成的主控因素,为鹿寨组下段海相优质烃源岩形成与演化提供理论依据。利用X射线衍射、有机碳含量及主元素、痕量元素含量测试等资料对寨沙剖面鹿寨组下段的沉积环境和有机质富集因素进行讨论。鹿寨组下段泥岩具有高脆性矿物、低黏土矿物的特征,有机碳质量分数为0.2%～4.54%,平均值为2.32%;古气候指标:古气候指数C、CIA和Sr/Cu比值分别为0.26～2.38、76.29～87.47及0.09～0.69,古氧化-还原指标:V/(V+Ni)、Ni/Co和V/Cr比值分别为0.36～0.99、2.23～9.9、2.3～26.26,古生产力指标:Ba、Cu和Ni质量分数分别为(231.32～4 128.26)×10~(-6)、(4.86～52.48)×10~(-6)、(79.99～620.27)×10~(-6)。地球化学特征显示鹿寨组下段沉积于半潮湿—潮湿气候条件下的贫氧—缺氧环境,具有中等初级生产力水平。相关性分析显示贫氧—缺氧的沉积环境是鹿寨组下段泥岩有机质富集的主控因素。
The geochemical characteristics of marine organic-rich mudstones in the Carboniferous lower Luzhai Formation in Luzhai area, central Guangxi are analyzed and the main controlling factors for its formation are discussed so as to provide theoretical basis for the study of formation and evolution of high-quality marine hydrocarbon source rocks. Based on the analysis of the X-ray, organic carbon content, major and trace elements of lower Luzhai Formation in Zhaisha section, the controlling factors of organic matter enrichment are discussed. It shows that the lower Luzhai Formation has high brittle mineral content and low clay mineral content with average mass fraction of organic matter of 2.32%. The rations of paleoclimate index C, CIA and Sr/Cu ratios are 0.26～2.38, 76.29～87.47 and 0.09～0.69, rations of paleo-redox index V/(V+Ni), Ni/Co and V/Cr are 0.36～0.99, 2.23～9.9, 2.3～26.26 and rations of paleo-productivity index of mass fraction of Ba, Cu and Ni are(231.32～4128.26)×10~(-6),(4.86～52.48)×10~(-6),(79.99～620.27)×10~(-6), respectively. Analysis of geochemical characteristics indicate that the lower Luzhai Formation is deposited in semi-humid to humid climate, under sub-anoxic to anoxic condition, with a medium primary productivity level. Correlation analysis shows that the sub-anoxic to anoxic sedimentary environment is the dominant factor for the organic matter enrichment of mudstone in the lower Luzhai Formation.
The geochemical characteristics of marine organic-rich mudstones in the Carboniferous lower Luzhai Formation in Luzhai area, central Guangxi are analyzed and the main controlling factors for its formation are discussed so as to provide theoretical basis for the study of formation and evolution of high-quality marine hydrocarbon source rocks. Based on the analysis of the X-ray, organic carbon content, major and trace elements of lower Luzhai Formation in Zhaisha section, the controlling factors of organic matter enrichment are discussed. It shows that the lower Luzhai Formation has high brittle mineral content and low clay mineral content with average mass fraction of organic matter of 2.32%. The rations of paleoclimate index C, CIA and Sr/Cu ratios are 0.26～2.38, 76.29～87.47 and 0.09～0.69, rations of paleo-redox index V/(V+Ni), Ni/Co and V/Cr are 0.36～0.99, 2.23～9.9, 2.3～26.26 and rations of paleo-productivity index of mass fraction of Ba, Cu and Ni are(231.32～4128.26)×10~(-6),(4.86～52.48)×10~(-6),(79.99～620.27)×10~(-6), respectively. Analysis of geochemical characteristics indicate that the lower Luzhai Formation is deposited in semi-humid to humid climate, under sub-anoxic to anoxic condition, with a medium primary productivity level. Correlation analysis shows that the sub-anoxic to anoxic sedimentary environment is the dominant factor for the organic matter enrichment of mudstone in the lower Luzhai Formation.
引文
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