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新疆胜利和田探区南部下二叠统烃源岩的有机地化研究
引用本文:刘庆,张林晔,等.新疆胜利和田探区南部下二叠统烃源岩的有机地化研究[J].南京大学学报(自然科学版),2001,37(1):114-121.
作者姓名:刘庆  张林晔
作者单位:[1]南京大学地球科学系,南京210093 [2]胜利油田地质科学研究院,东营257000
摘    要:以下二叠统克孜里奇曼组(P1k)海相碳酸盐岩为主要研究对象,对新疆胜利和田探区南部的石炭-二叠系海相烃源岩开展了系统研究。有机岩石学分析表明,该套烃源岩具有陆源和海相有机质双重输入的特点,有机质呈现偏腐殖的特征,干酪根以Ⅲ,Ⅱ型为主,与碳酸盐岩通常具有的较好有机质类型存在一定差别。有机地化分析也支持上述结论,并且指示出沉积环境并非严格的强还原环境。分析认为造成有机质类型较差的原因主要有3种,即陆源有机质输入、宏观藻类的贡献以及沉积环境充氧造成的有机质氧化。根据以上有机岩石学和有机地化分析的结果,结合碳酸盐岩孔隙度低,排烃较晚的特点,确定该套烃源岩以生成轻质烃类为主。塔西南地区广泛发育有石炭-二叠系海相碳酸盐岩沉积,该套气源岩对于区内天然气的勘探具有一定的石油地质意义。

关 键 词:新疆和田  下二叠统  海相碳酸盐岩  混源有机质  天然气  烃源岩

Organic Geochemistry of The Lower Permian Source rocks in the South Shengli - Hetian Exploration Region, Xinjiang, Western China
Liu Qing,Hu Kai,Zhang Lin-ye,Xu Xing-gou,Chen Zhi-lin.Organic Geochemistry of The Lower Permian Source rocks in the South Shengli - Hetian Exploration Region, Xinjiang, Western China[J].Journal of Nanjing University: Nat Sci Ed,2001,37(1):114-121.
Authors:Liu Qing  Hu Kai  Zhang Lin-ye  Xu Xing-gou  Chen Zhi-lin
Abstract:The Lower Permian marine carbonate sediments in the south Shengli-Hetian exploration region(Xinjiang )are investigated characterize their organic geochemistry. In this study, 24 samples are selected from the cores of Well Hecan-1 and for outcrop sections in Aqik,Piaman,Duwa and Sangzhu. In most areas, the Lower Permian marine carbonate sediments are dominated by dark gray to black muddy micritic limestones and marlstones deposited in restricted carbonate pltforms.Organic petrology studies suggest that sediments of P1k have double inputs of marine and terrestrial organic matter,and show a kind of humic characteristics mainly with III & II type kerogen.Organic geochemistry studies also support the fact.Main of single modal C+12 n-alkane distribution pat- terns with modes of n-C25and n-C27,low sterane/hopane ratios,relatively higher MCC6 in C7 Light hydrocarbon from acid-released gas all suggest the terrestrial high plants or refractory organic matter is one source of the Organic matter in- put while V-type regular sterane distributions with dominantly C27 regular sterane suggest that marine phytoplankon in the other source.In addition, the carbonate samples have high diasterane/sterane ratios and can attribute to acidity and relative oxidation of their sedimentary esdimentary environment. Based on the organic petrology and organic geochemistry analysis,we propose three reasons for the humic kerogen to be formed : input of organic matter of terrestrial high plants, existing of macro-algae,and oxidization of organic matter. According to the characteristics of P1k marine source rocks,especially composition of organic micro-macerals,low porosity and low permeability,we believe that main of light hydrocarbons can be produced. As Jurassic carboniferous sediments,the other important source rocks in southwest Tarim basin also produce gas mainly,the exploration in the southwest of this area should focus on natural gas and condenstate gas .
Keywords:Winjiang  Permian  marine carbonate  mixing organic matter  natural gas
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