Relationship Between Petroleum Composition and Depositional Environment of Petroleum Source Rocks
Relationship Between Petroleum Composition and Depositional Environment of Petroleum Source Rocks
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DOI：
10.1306/ad462bc8-16f7-11d7-8645000102c1865d
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发表时间：
1985-08
期刊：
影响因子：
3.5
通讯作者：
J. Moldowan;W. K. Seifert;E. J. Gallegos
中科院分区：
文献类型：
--
作者：
J. Moldowan;W. K. Seifert;E. J. Gallegos
近40种原油样品表明，利用一系列地球化学参数可以区分陆相原油、海相页岩原油和海相碳酸盐岩原油。一个新的参数的基础上存在的C30甾烷的石油被发现是一个明确的指示的来源，从海洋衍生的有机物的贡献。第二个新的参数monoaromatized类固醇分布的基础上是有效的，有助于区分nonmarine从海洋原油，并可用于衡量在一个给定的盆地内的石油较高的植物输入的相对数量。甾烷分布同样适用于检测更高的植物输入，但比monoaromatize类固醇分布海洋与非海洋的区别是有效的。高分子量石蜡的浓度也可以是有效的非海洋指标，但受成熟和生物降解过程的影响。某些藻类衍生的非海洋石油可能几乎不显示高分子量石蜡响应。来自碳酸盐源的油（除了少数例外）可以通过具有低的植烷-植烷比率、低碳偏好指数和高硫含量来区分。全原油伽马蜡烷指数和碳同位素比值不能有效区分这些类型的全球环境差异。
Crude oils of nonmarine source can be distinguished from those of marine shale source and from oils originating in marine carbonate sequences by using a battery of geochemical parameters, as demonstrated with a sample suite of nearly 40 oils. A novel parameter based on the presence of C30 steranes in the oil was found to be a definitive indication of a contribution to the source from marine-derived organic matter. A second novel parameter based on monoaromatized steroid distributions was effective in helping to distinguish nonmarine from marine crudes and can be used to gauge relative amounts of higher plant input to oils within a given basin. Sterane distributions were similarly useful for detecting higher plant input but were less effective than monoaromatize steroid distributions for making marine versus nonmarine distinctions. Concentrations of high molecular-weight paraffin can also be effective nonmarine indicators but are influenced by maturation and biodegradation processes. Certain algal-derived nonmarine oils may show little high molecular-weight paraffin response. Oils from carbonate sources (with a few exceptions) can be distinguished by having low pristane-phytane ratios, low carbon preference indexes, and high sulfur contents. Gammacerane indexes and carbon isotope ratios of the whole crude are not effective in distinguishing these types of environmental differences on a global basis.