摘要
以延川南地区3口井山西组太原组的煤和夹矸样品为研究对象,采用光学显微镜测试方式,对样品进行有机质成熟度测定和有机质类型分析;总结煤和夹矸的有机质成熟度差异、反射率镜下测点的形态及光学特征差异。结合研究区大量沉积资料,分析导致煤和夹矸有机质差异的原因。研究结果表明:1)煤岩的有机质成熟度大于夹矸;2)研究区中夹矸镜质体反射率的测定对象以均质镜质体、基质镜质体和均匀凝胶体3种为主,无细胞结构;3)由于沉积相的控制,沉积物输入不同,导致煤和夹矸的母源供给产生差异,不同于由高等植物形成的煤岩,形成夹矸中有机质的成分以浮游生物和藻类为主;4)同时期高等植物形成的有机质反射率值要高于浮游生物和藻类为主形成的镜质体。
Taking coal and gangue samples of Taiyuan Formation and Shanxi Formation in three wells in Yanchuannan as the research object,the samples were tested by optical microscope to measure the organic matter maturity and type of organic matter.Summarize the differences in the maturity of organic matter between coal and gangue,and the differences in the morphology and optical characteristics of the measuring points under the microscope.Combined with a large number of sedimentary data in study area,the reasons for the difference in organic matter between coal and gangue were analyzed.The research results show that:1)The organic matter maturity of coal is greater than that of gangue;2)The measurement objects of the reflectance of gangue vitrinite in the study area are mainly homogeneous vitrinite,matrix vitrinite and homogeneous gel,with no cell structure;3)Due to the control of sedimentary facies,the input of sediments is different,which leads to the difference in the parent source supply of coal and gangue,unlike the coal formed by higher plants.the organic matter in the gangue is formed by plankton and algae;4)The reflectance value of organic matter formed by higher plants in the same period is higher than that of vitrinite formed mainly by plankton and algae.
作者
李小越
龚月
LI Xiaoyue;GONG Yue(Exploration and Development Research Institute of East China Oil and Gas Company,SINOPEC,Nanjing 210094,China)
出处
《非常规油气》
2022年第6期27-33,共7页
Unconventional Oil & Gas
基金
国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061)
中国石化科技部项目“渝东南盆缘转换带页岩气富集主控因素研究”(P21042-4,P20059-6,P19017-3)。
关键词
夹矸
煤
沉积环境
有机质
gangue
coal
depositional environmental
organic matter
