A Method for Observation of Characteristics of Hydrocarbon Generation Materials in Electron Probe Thin Sections of Black Source Rock by the Reflected-light Viewing System of a Polarized Optical Microscope
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摘要: 鄂尔多斯盆地上三叠统延长组长7油层组的黑色泥岩、油页岩等黑色生油岩薄片中的生烃母质，因黑色石油、沥青等黑色有机质的覆盖或不透明，导致其在偏光显微镜透射光系统下观察常局部或整体呈现为黑色。因此，建立一种黑色生油岩薄片中生烃母质有效观察的方法，对致密油、页岩油的生烃研究具有重要的理论和实际意义。本文提出了一种利用电子探针薄片和偏光显微镜的反射光系统观察黑色生油岩中生烃母质特征的方法。该方法能够克服黑色生油岩薄片中生烃母质因被黑色有机质覆盖或不透明，而在偏光显微镜的透射光系统下局部或整体呈黑色的弊端，能够对生烃母质的大小、形态、结构、分布和物质成分等特征进行整体且清晰的观察。实践表明，本文提出的利用偏光显微镜反射光系统观察黑色生油岩电子探针薄片中生烃母质特征的方法，简单有效，易在致密油、页岩油的生烃研究领域推广使用。
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关键词:
- 黑色生油岩 /
- 黑色有机质 /
- 生烃母质 /
- 偏光显微镜反射光系统 /
- 电子探针薄片
Abstract:BACKGROUNDThe hydrocarbon generation materials in thin sections of black source rocks (such as black mudstone, oil shale), from the Chang 7 Member of the Upper Triassic Yanchang Formation in the Ordos Basin, are often partially or entirely black under the transmitted-light viewing system of a polarized optical microscope, because they are covered by black organic matter (such as oil, asphaltene) or opaque. OBJECTIVESTo put forward an effective method to observe the hydrocarbon generation materials in thin sections of black source rock. METHODSA method for observation of characteristics of hydrocarbon generation materials of black source rock was proposed, using the reflected-light viewing system of a polarized optical microscope on electron probe thin sections. RESULTSThe method can overcome the problem that hydrocarbon generation materials in thin section were covered by black organic matter or were opaque. The size, shape, structure, distribution of hydrocarbon generation materials and composition can be entirely and clearly observed in thin sections of black source rock. CONCLUSIONSIn the long-term test, it has been proved that the method for observation of characteristics of hydrocarbon generation material in thin sections of black source rock by the reflected-light viewing system of a polarized optical microscope is simple and effective, and can be easily used in the study of hydrocarbon generation of tight oil and shale oil. -
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