Organic Petrologic Description and Study of Low Mature Source Rocks from the South Slope of the Dongying Depression
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摘要: 本文利用显微光度术，对东营凹陷南斜坡沙四段低熟烃源岩有机显微组分进行了分类和定量，研究了凹陷各部位不同深度显微组分的特征、组成和分布，发现小古囊藻在本区某些层段尤其丰富，丛粒藻、盘星藻、渤海藻时有可见，全岩中矿物沥青基质与干酪根中的无定形含量呈正相关，确定了由低等水生生物来源的无定形是本区的主要生油母质之一。利用镜质体反射（Ｒｏ%）与烃类转化率关系，结合藻类热模拟实验，从有机岩石学的角度探讨了低熟烃源岩中有机质的性质、成烃及演化。Abstract: The organic macerals of low maturity source rocks of Es4 in Dongying Depression were classified andquantified by using microscope photometry,and the macerals were cassified into 6 groups as followsinerinite, vitrinite, exinite, sapropelinite, organozooclastinite and secondary group. thdr the property, composition and distribution in different depth and position of this depression. were also studied In ana-lyzing ,it showed that Palaeostomosystis minor is rich especially in some beds, with the common presenceof Botryococcus,Pediastrum sp andBohaidina sp. A direct proportionality exists between mineral itumi-nous groundmass and amorphous substance. In the low mature source rocks from the Domgying Depres-sion, amorphous substance was decomposed by low aquatic organisms and was further determined to beone of the major parent materials of oil and gas. Using the relationship between vitrinite reflectance and conversion efficiency of hydrocarbons and combining the thermal modelling the genesis hydrocarbon-generating and evolution patterns could be well understood from the viewpoint of organic petrology.
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[1] 1 王铁冠.钟宁宁等.低熟油气形成机理与分布.北京:石油工业出版社.序.
2 杨起等.中国煤田地质学(上册)北京:煤炭工业出版社.197942.
3 肖贤明.有机岩石学及其在油气评价中的应用.广州:广东科技出版社，1992, 47. -
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