陆相盆地古生产力研究现状

Current Status of Paleoproductivity Research in Continental Basins

古生产力是指地质历史时期生物在能量循环过程中固定能量的速率。陆相盆地古生产力的研究包括古生产力的大小及其组成研究两个方面。目前主要通过有机碳、生物硅和生物标志化合物等指标来评估陆相盆地古生产力的大小;通过生物标志化合物指标,包括正烷烃、萜类、甾类分子标志化合物等指标来研究陆相盆地古生产力的组成。陆相盆地古生产力的定量化研究比较欠缺,仅在有机碳、生物硅及生物标志化合物指标方面建立了数学模型,且多是对海相盆地古生产力指标的直接沿用;而在色素、湖相碳酸盐等具陆相特点的指标方面仅见部分定性研究。在地学应用方面,以陆相盆地古生产力研究为基础的地球生物学方法,在正演陆相烃源岩的形成过程研究中具有良好的前景。

Paleoproductivity is the organism energy-fixation rate in the carbon circle during the geologic history.It is embodied in two aspects in the continental basin： the estimation of quantity and the study of biogenic source.Current proxies such as organic carbon,biosilica and biomarkers are applied in the qualitative assessment.While biomarkers including n-alkane,terpene and sterid are utilized to illuminate their biogenic source.There is still inadequate quantitative research on continental paleoproductivity and only few models are established in respects of organic carbon,biosilica,and biomarkers proxies which are almost directly derived from oceanic paleoproductivity proxies.While some continental-characteristic proxies such as pigment and lacustrine carbonate are merely partially and qualitatively studied.In the case of geological application,the bio-geological forward model based on continental paleoproductivity is already proposed to evaluate the source rocks in continental basin.