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Precambrian Hydrocarbons — Products of a Changing Geology and Biology through Time

机译：前寒武纪碳氢化合物-随时间变化的地质和生物学产物

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All sedimentary basins, regardless of age, are the result of the interaction of sediment supply and subsidence of the crust as a result of structural processes and thermal regime. Sediments sources to basins, including organic matter, are dictated by (ⅰ) biological evolution, (ⅱ) eustasy and (ⅲ) paleo-climate. How much of what we know about these three factors—and how they have changed over geologic time—pose a serious challenge to our interpretations of basin formation. The Precambrian encompasses approximately 88% of all Earth history; it is the time during which the planet formed, life emerged and all major groups of multicellular organisms originated (e.g. animals, plants and fungi). The record of biology and geology from this time provides insights into the origin and evolution of the oldest sedimentary basins, and the hydrocarbons they may contain. It is unknown when modern-style (conventional) plate tectonics was established on Earth; heat production from intrinsic radioactivity in the young planet was a factor of 2-8x greater than present. The consequences of these factors were elevated levels of magmatic activity, crust formation and crustal recycling, as well as enhanced thermal metamorphism. Change in the composition of the atmosphere over time has influenced the kind of weathering taking place as reflected in changes in sedimentation style and the types of sediments formed. The dominant form of life in the Precambrian was microbial. It was not until sometime in the Late Proterozoic when the first large eukaryotic cells emerged prior to proliferation of multicellular life. These factors, compounded by the rarified rock record from the earliest times and difficulties in determining ages of formation, provide challenges and opportunities in exploring the ultimate origin of the familiar style of Phanerozoic sedimentation, basin formation and hydrocarbon generation.
机译：所有沉积盆地，无论其年龄如何，都是结构过程和热力状态导致沉积物供应与地壳沉降相互作用的结果。流域（包括有机物）的沉积物来源取决于（ⅰ）生物演化，（ⅱ）摇头丸和（ⅲ）古气候。我们对这三个因素了解多少，以及它们随着地质时间的变化如何，对我们对盆地形成的解释提出了严峻的挑战。前寒武纪涵盖了整个地球历史的约88％；这是行星形成，生命出现，所有主要的多细胞生物（例如动物，植物和真菌）起源的时期。这段时间的生物学和地质记录提供了对最古老沉积盆地的起源和演化以及它们可能包含的碳氢化合物的见解。在地球上建立现代（传统）板块构造的时间尚不清楚。年轻行星的固有放射性产生的热量是现在的2-8倍。这些因素的后果是岩浆活动水平升高，地壳形成和地壳再循环以及热变质作用增强。随着时间的推移，大气成分的变化影响了风化的类型，这反映在沉积形式和沉积物类型的变化中。前寒武纪中主要的生命形式是微生物。直到元古代晚期，才有第一批大的真核细胞出现在多细胞生命的增殖之前。这些因素加上最早的稀疏岩石记录以及确定地层年龄的困难，为探索熟悉的生代沉积，盆地形成和生烃方式的最终起源提供了挑战和机遇。

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