摘要
滇黔桂南盘江坳陷上古生代海相碳酸盐岩的天然沥青中,发育沥青中间相小球,通过反射光的镜下观察,中间相沥青为一轴晶负光性。其镜下结构形态可分为5种。讨论了区内中间相沥青的形成及地质意义,认为这是有机质过成熟期后的特征,并能提供古油藏的信息。
The mesophase bitumen, small ball-shaped, is widely distributed in Upper Paleozoic carbonate rocks in the Nanpanjiang depression, which can be dividied into five genetic types. Microscopic examination in reflected light shows that the mesophase bitumen occurs as monoaxial crystals (-) and are characterized by high bireflectance and strong pleochroism in cross-polarized light. According to its microscopic textural forms the mesphase bitumen can be divided into: (1) mesophase spherulite; (2) agglomerated mesophase spherulite; (3) mosaic texture; (4) strip texture ; and (5) plate-like texture. The mechanism of formation of mesophase bitumen in this region and its geological significance are discussed, providing evidence suggesting that this mesophase bitumen can reflect the features of organic matter after the over-maturity stage and it is of great significance in identifying the maturation degrees of organic matter and can thus provide information on ancient oil pools.
出处
《地球化学》
CAS
CSCD
北大核心
1992年第4期391-398,T001,共9页
Geochimica
