ORGANIC MACERAL CHARACTERISTICS AND HYDROCARBON-GENERATING POTENTIALS OF SOURCE ROCKS IN THE PEARL RIVER MOUTH BASIN
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摘要: 采用有机岩石学综合光学法研究了珠江口盆地古近系烃源岩的有机显微组分和亚显微组分特征,对典型烃源岩做了干酪根元素分析、岩石热解分析和高温高压泥岩热模拟实验,探讨了其生烃潜力和生烃属性。壳质组及富氢的壳镜组A含量较高,决定了中深湖相有机质的类型为Ⅰ—Ⅱ1型,具倾油性;低含氢的壳镜组B和镜质组含量较高,决定了滨浅湖相和沼泽相有机质的类型主要为Ⅲ—Ⅱ2型(Ⅱ1型为辅),具倾凝析油、气性;腐泥组和惰质组含量低。2类烃源岩在不同演化阶段生烃属性均存在差异。这对进一步研究该盆地古近系不同凹(洼)陷有机相及勘探潜力和方向具有重要意义。Abstract: Organic maceral and sub-maceral characteristics of source rocks in Paleogene in the Pearl River Mouth Basin have been studied by means of compositive optics of organic petrology.It is also discussed the hydrocarbon generating potentials and features by element analyses on kerogen,rock-eval analyses and high temperature and pressure simulation on source rocks.Relatively abundant exinite and exinite-vitrinite A rich in hydrogen result in oil-prone type Ⅰ-Ⅱ1 of organic matter in medium-deep lacustrine facies.Relatively abundant exinite-vitrinite B pool in hydrogen and vitrinite result in gas and condensate-prone type Ⅲ-Ⅱ2 of organic matter in shore-shallow lacustrine and swamp facies.Sapropelinite and intertinite contents are low.The two types of source rocks have different hydrocarbon-generating features in various phases. Those conclusions are important for the further studies of organic facies and exploration potential and prospect in different depressions(sags) in the basin.
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