贵州地区下寒武统牛蹄塘组烃源岩热水沉积成因鉴别与强度评价

doi:10.11743/ogg20180302

Abstract

Abstract: The study case is the source rocks of the Lower Cambrian Niutitang Formation in Guizhou area.Their trace element content is analyzed to accurately identify the hydrothermal sedimentation effect on source rocks and evaluate the intensity of the effect.The results show that(1)the diagram V/Sc-V/Cr can be used to judge whether hydrothermal sedimentation effect is a contributing factor for the composition of source rocks in the study area,which in turn,can reflect the redox environment change;(2)the slope Sc/Cr ratio is applicable for evaluating the intensity of hydrothermal sedimentation:when the Sc/Cr ratio is more than or equal to 0.144,normal sedimentation dominates and hydrothermal sedimentation effect is weak,and there is a linear correlation between V/Sc and V/Cr ratios,reflecting the redox environment change;when the Sc/Cr ratio is less than or equal to 0.120,hydrothermal sedimentation dominates,and the V/Cr ratio,which is distorted by the element content anomaly in the hydrothermal sediments,can not indicate the actual change of the redox environment,but remain useful to indicate the environment change;however,when the Sc/Cr ratio varies from 0.120 to 0.144(with both ends included),both sedimentary processes function,and the value of V/Cr ratio is influenced by the hydrothermal sediments,but can still indicate the trend of redox environment change,and thus can be applied normally.The conclusion can be drawn that the diagram V/Sc-V/Cr can accurately identify the influence and indicate the intensity of the hydrothermal sedimentation on source rocks.

Key words: trace element, hydrothermal sedimentation, source rock, Niutitang Formation, Cambrian Guizhou area

CLC Number:

TE121.1

Jia Zhibin, Hou Dujie, Sun Deqiang, Jiang Yuhan, Zhang Ziming, Hong Mei. Genesis and intensity of hydrothermal sedimentation in hydrocarbon source rocks in the Lower Cambrian Niutitang Formation,Guizhou area[J]. Oil & Gas Geology, 2018, 39(3): 429-437.

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Genesis and intensity of hydrothermal sedimentation in hydrocarbon source rocks in the Lower Cambrian Niutitang Formation,Guizhou area

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