桦甸盆地古近系桦甸组含油页岩段油页岩特征及成因分析
首发时间:2014-09-23
摘要:通过岩心观察、薄片鉴定,X衍射以及含油率、TOC、密度和岩石热解等测定分析方法,从岩石学、矿物学、有机地球化学特征和有机质类型等几个方面对桦甸盆地古近系桦甸组含油页岩段油页岩进行研究,进而揭示不同含油率油页岩的特征及成因环境。桦甸盆地古近系桦甸组含油页岩段共发育13层油页岩,其中1-6层油页岩含油率较高,主要为褐色和黑褐色,碳酸盐矿物含量较高;7-13层油页岩含油率较低,主要为灰黑色或深灰色,粘土矿物含量较高。本区油页岩的FA与密度、TOC、S2、S3、HI和OI存在明显的相关性,其中TOC、S2 、S3和HI随FA的升高而升高;而密度和OI随FA的升高而降低,且随着FA的升高,有机质类型由II1型逐渐过渡为I型。综合分析表明,1-6层油页岩形成于深湖-半深湖的静水环境,有机质主要来源于湖泊生物;7-13层油页岩有机质主要来自湖泊生物和陆源高等植物,沉积环境为半深湖。
关键词: 矿物学、岩石学、矿床学 油页岩特征 成因分析 桦甸组 古近系 桦甸盆地
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Genesis Analysis and Characteristics of Oil Shale in the Oil Shale Member of Paleogene Huadian Formation, Huadian basin
Abstract:In this paper, through the method of core observation, microscope identification, X-ray diffraction and oil content, TOC, density and rock pyrolysis measurement and analysis methods, this study is aimed to study the oil shale in oil shale-bearing member of Paleogene Huadian Formation from Petrology, Mineralology and Organic Chemistry perspectives, to uncover their differences in characteristic and generation environment.Thirteen layers oil shale are developed in target area, which could be divided into two groups: Layer 1-6 is characterised by brown and dark brown colour, relatively high oil content, relatively more carbonate minerals; Layer 7-13 is characterised by gray-black and dark gray colour, relatively low oil content, relatively more clay minerals as a comparison. From a whole view, consistency between FA and density, TOC, S2, S3, HI, OI is obvious among all developed layers. Positive relationships occur between FA and TOC, S2, S3, HI, while negative relationship of OI, density and FA is as expected. Types of organic matter gradually transit from II1 type to I type.Comprehensively and conclusively, Layer 1-6 is formed in semi-deep lake and deep lake environment, with lacustrine as the main source; Layer 7-13 comes from lacustrine and terrestrial plants, deposited in semi-deep lake environment.
Keywords: Mineralogy, Petrography, Ore Mineralogy Characteristics of oil shale Genesis Analysis Huadian Formation Paleogene Huadian Basin
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No.4610240100364014****
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