海相碳酸盐岩二苯并噻吩类化合物成熟度参数研究进展与展望

Research Development and Prospect of Maturity Parameters of Methylated Dibenzothiophenes in Marine Carbonate Rocks

热成熟度是评价各地质时期沉积盆地烃源岩和油气演化的必要参数。近二十余年国内外研究结果表明 ,二苯并噻吩系列化合物成熟度参数有望成为高 -过成熟阶段海相碳酸盐岩及其油气有效分子成熟度指标。建立高 -过成熟阶段碳酸盐岩烃源岩二苯并噻吩系列化合物成熟度参数与岩石Ro(通过沥青反射率或海相镜质体反射率换算 )之间的关系式是目前国内外石油地球化学界尚未解决的问题。该关系式的建立对我国下古生界和中上元古界碳酸盐岩来源之油、气成熟度Ro值的确定及油、气 /源岩对比研究将提供比较可靠的新方法。对指导我国海相地层油气勘探具有广阔的应用前景。

Thermal maturity is a necessary parameter in assessing source rocks and evolution of oils and gases in sedimentary basins. It is shown from the investigations of over the past twenty years that the maturity parameters of methylated dibenzothiophenes are expected to be the efficient molecular maturity indices of marine carbonate source rocks and their oils or gases at high and overmature stages. It has been an unsolved problem up to now to create relationship between methylated dibenzothiophene maturity parameters and Ro values of carbonate source rocks (converted from solid bitumen reflectance-Rb, or marine vitrinite reflectance-R M o) at high and overmature stages. The creation of the above relationship will provide a more reliable new method for calculation of oils and gases Ro values, as well as for oil-source or gas-source correlation of Lower Palaeozoic and Middle-Upper Proterozoic carbonate source rocks. Therefore, it has broader and brighter application prospects in guiding future oils and gases exploration of marine strata in chima.