准噶尔盆地南缘二叠系芦草沟组烃源岩地球化学特征
发布时间：2019-01-20 18:54
【摘要】：准噶尔盆地含有丰富的油气资源,南缘地区构造复杂,勘探程度低,勘探潜力大。本文以准噶尔盆地南缘西大龙口地区的芦草沟组剖面为切入点对该地区烃源岩地球化学 .特征进行研究,通过有机地球化学特征探讨了该地区芦草沟组烃源岩的有机质丰度、类型及成熟度方面的信息,利用生物标志化合物和元素地球化学的方法对控制该地区烃源岩形成的古气候、古盐度及古水体氧化还原环境方面的因素进行了分析,从而更好地为该地区油气勘探提供依据。有机碳含量、氯仿沥青“A”、有机碳同位素及类异戊二烯烷烃的Pr/n-C17和Ph/n-C18值参数表明研究区烃源岩有机质丰度高、有机质类型属I-II型;生物标志化合物参数表明研究区烃源岩有机质母质来源主要为藻类等低等水生生物,湖盆水体中含量高的P元素为藻类的繁殖提供了营养物质,加上较温暖湿润的古气候条件,促使藻类大量繁殖,为优质烃源岩的形成提供了物质基础;研究区烃源岩有机质成熟度并不高,生物标志化合物成熟度参数表明研究区芦草沟组烃源岩基本处于低成熟-中等成熟度阶段;生物标志化合物参数和微量、稀土元素参数综合分析表明,研究区烃源岩形成于水体中氧气量适中的弱氧化-弱还原环境,水体中盐度较高从而导致还原环境增强。
[Abstract]:Junggar Basin is rich in oil and gas resources. The southern margin of Junggar Basin is characterized by complex structure, low exploration degree and great exploration potential. Based on the Luchaogou formation section in the west Dalong mouth area of the southern margin of Junggar Basin, the source rock geochemistry in this area is studied. Based on the organic geochemical characteristics, the information on the abundance, type and maturity of organic matter in the source rocks of the Luchaogou formation in this area is discussed. The factors controlling the paleoclimate, paleosalinity and redox environment of the source rocks in this area are analyzed by means of biomarker compounds and element geochemistry, so as to provide a better basis for oil and gas exploration in this area. The organic carbon content, chloroform bitumen "A", organic carbon isotope and the Pr/n-C17 and Ph/n-C18 values of isoprene alkanes indicate that the organic matter abundance of source rocks in the study area is high, and the organic matter type belongs to I-II type. The biomarker parameters indicated that the source material of organic matter of source rock in the study area was mainly algae and other low aquatic organisms, and the high content of P in the lake basin provided nutrients for algae propagation, plus warm and humid paleoclimate conditions. To promote the algae to multiply in large quantities, which provides the material basis for the formation of high quality hydrocarbon source rock. The maturity of organic matter of source rocks in the study area is not high, and the maturity parameters of biomarkers indicate that the source rocks of the Luchaogou formation in the study area are basically in the stage of low maturation to medium maturity. The comprehensive analysis of biomarker parameters and trace and rare earth element parameters shows that the hydrocarbon source rocks in the study area were formed in the weak oxidation-weak reduction environment with moderate oxygen content in the water body, and the salinity in the water body was relatively high, which led to the enhancement of the reduction environment.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
[Abstract]:Junggar Basin is rich in oil and gas resources. The southern margin of Junggar Basin is characterized by complex structure, low exploration degree and great exploration potential. Based on the Luchaogou formation section in the west Dalong mouth area of the southern margin of Junggar Basin, the source rock geochemistry in this area is studied. Based on the organic geochemical characteristics, the information on the abundance, type and maturity of organic matter in the source rocks of the Luchaogou formation in this area is discussed. The factors controlling the paleoclimate, paleosalinity and redox environment of the source rocks in this area are analyzed by means of biomarker compounds and element geochemistry, so as to provide a better basis for oil and gas exploration in this area. The organic carbon content, chloroform bitumen "A", organic carbon isotope and the Pr/n-C17 and Ph/n-C18 values of isoprene alkanes indicate that the organic matter abundance of source rocks in the study area is high, and the organic matter type belongs to I-II type. The biomarker parameters indicated that the source material of organic matter of source rock in the study area was mainly algae and other low aquatic organisms, and the high content of P in the lake basin provided nutrients for algae propagation, plus warm and humid paleoclimate conditions. To promote the algae to multiply in large quantities, which provides the material basis for the formation of high quality hydrocarbon source rock. The maturity of organic matter of source rocks in the study area is not high, and the maturity parameters of biomarkers indicate that the source rocks of the Luchaogou formation in the study area are basically in the stage of low maturation to medium maturity. The comprehensive analysis of biomarker parameters and trace and rare earth element parameters shows that the hydrocarbon source rocks in the study area were formed in the weak oxidation-weak reduction environment with moderate oxygen content in the water body, and the salinity in the water body was relatively high, which led to the enhancement of the reduction environment.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
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相关期刊论文 前10条
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2 李颖;朱扬明;郝芳;邹华耀;郭彤楼;;四川盆地北部上三叠统须家河组高成熟煤系烃源岩芳烃热演化与应用[J];中国科学:地球科学;2015年07期
3 陈建平;王绪龙;邓春萍;赵U，
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