未成熟碳酸盐生油岩地球化学特征初探

AN APPROACH TO THE GEOCHEMICAL CHARACTERISTICS OF IMMATURE CARBONATE SOURCE ROCKS

徐伟民

Xu Weimin

石油工业部江苏油田地质科学研究院

Geological Research Instiute of Jiangsu Oil Field, Ministry of Petroleum Industry

江苏句容盆地继下青龙组(T1x)碳酸盐岩产层中发现自生自储的低—中等成熟度原油之后,又在上覆上青龙组(T1s)见到未成熟的碳酸盐生油岩。这种在地质时代相对较老的早三叠世中见到未成熟碳酸盐生油岩的情况,国内尚属首次发现,值得引起重视。本文主要应用烃类组成、岩石热解色谱、烷烃气相色谱、干酪根红外吸收光谱和镜质体反射率等分析成果,对未成熟碳酸盐生油岩的地球化学特征及其地质成因进行探讨。

After the crude oil of low-middle maturity, which generated and accumu-lated in situ, was found in the carbonate source bed of the Lower Qinglong Formation (T1X), Jurong Basin of Jiangsu,immature carbonate source rocks are also found in Upper Qinglong Formation(T1s). Such a discovery of immature carbonate source rocks in Lower Triassic, which relatively is rather old in geological time, is the first time in China, and it merits geologists attention. Analytical data of the composition of hydrocardon compounds, pyrolysis GC of rocks, GC of alkanes, IR of kerogens, and R° are used to reveal the geochemical characteristics of the immature carbonate source rocks and the geological origin.

https://doi.org/10.11781/sysydz198603290