乌尔禾地区油砂光谱特征及其与烷烃含量的关系  

Spectral Characteristics of Oil Sand and Its Relationship with Alkane Contents in Wuerhe Area, Junggar Basin

作　　者：童勤龙[1] 刘德长[1] 余永安[2] 徐本宏 

机构地区：[1]核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室,北京100029 [2]中国地质大学地球科学与资源学院,北京100083

出　　处：《新疆石油地质》2017年第1期49-54,共6页Xinjiang Petroleum Geology

基　　金：中国地质调查局油气战略选区项目(1211302108019-1)

摘　　要：通过对准噶尔盆地乌尔禾地区典型油气渗漏区地物光谱测量和化学分析测试,讨论油气渗漏引起的地物异常光谱特征及其与烷烃含量的关系。结果表明,不同烷烃含量的宏观渗漏异常光谱在2 310—2 350 nm的"W"型双吸收峰较稳定,在1 725 nm和1 760 nm附近的单吸收峰变化较大;微观渗漏异常由于烃类含量较少,其光谱在烃类吸收波段的吸收特征不明显,但岩石薄片和光谱显示黏土化蚀变明显。乌尔禾地区油气渗漏引起的黏土化主要为蒙脱石化和伊利石化,通过对不同程度油气渗漏引起的黏土化光谱测量和观察,发现强油气渗漏引起的黏土化光谱在2 210 nm附近的羟基吸收峰深度大,弱油气渗漏引起的黏土化光谱在2 210 nm附近的吸收峰深度较小,此吸收峰深度可间接反映油气渗漏的强弱。通过对油砂光谱在2 310 nm附近的吸收峰("W"型双吸收峰的左侧峰)宽度、深度、面积、对称度等参数统计和饱和烃色谱质谱分析,发现吸收峰深度与油砂中烷烃含量呈明显的线性关系,通过拟合的线性表达式,可用吸收峰深度参数估算烷烃的含量,为区域油气探测提供参考。By means of spectrometry technology and chemical analysis and test in typical oil and gas seepage areas in Wuerhe area of Jung-gar basin, the paper discusses the abnormal spectral characteristics caused by the seepage and its relationship with and alkane contents.The results show that on the macroseepage abnormal spectrum of different alkane contents, W-shaped and double absorption peaks rangingfrom 2 310 to 2 350 nm are stable and single absorption peaks vary largely around 1 725 nm and 1 760 nm; the hydrocarbon absorptioncharacteristics of microseepage are not obvious due to low hydrocarbon contents, but obvious clay alteration can be observed from rock thinsections and spectra. The clayization resulted from oil and gas seepage is dominated by montmorillonitization and illitization in Wuerhe ar-ea. Based on the measurement and observation of clay spectra caused by oil and gas seepage of different degrees, it is found that the depthof absorption peak of hydroxyl is large around 2 210 nm on the clay spectrum resulted from strong oil and gas seepage, whereas the depth ofabsorption peak is relatively small around 2 210 nm on the clay spectrum caused by weak seepage. The depth of absorption peak can reflectthe intensity of oil and gas seepage indirectly. Based on the statistics of width, depth, area and symmetry of absorption peaks around 2 310nm（ the left peak of W-shaped and double absorption peak） on oil sand spectrum and analysis on chromatography-mass spectrometry of sat-urated hydrocarbons, it is found that there is a linear relationship between the depth of absorption peak and alkane content of oil sand, andalkane contents can be estimated with the parameters of absorption peak depth through a matched linear expression, which could providereferences for regional petroleum prospecting.

关 键 词：准噶尔盆地 乌尔禾地区 油气渗漏 光谱特征 油砂 黏土化蚀变 烷烃含量 

分 类 号：P744.4[天文地球—海洋科学]