倪丘集断陷石炭二叠系煤系二次演化生烃的初步研究

A PRELIMINARY STUDY ON HYDROCARBON GENERATION FROM SECONDARY EVOLUTION OF THE CARBONIFEROUS-PERMIAN COAL SERIES IN NIQIUJI FAULT-DEPRESSION

韩云生

Han Yunsheng

地矿部华北石油地质局 郑州 450006

North China Bureau of Petroleum Geology, Zhengzhou

笔者应用氯仿沥青A、烃含量、氢碳原子比、煤岩显微组分和镜煤反射率等参数,系统地对比了处于同一断陷中原始沉积相同,但新生代覆盖厚度不同的南6和南11井,发现区内石炭二叠系煤系确实存在二次演化生烃过程,并初步判别了二次演化生烃门限深度为3400m,起始排烃深度为4000m,上述认识对今后寻找煤系二次演化形成的煤成气(油)藏有一定的指导意义。

Using parameters of bitumen A, hydrocarbon content, hydrogen/carbon, atomic ratio, macer als and vitrinitc reflectance, a systematic correlation on the parameters from the wells Nan 6 and Nan 11 has been made. The two wells are located within the same faulted depression and have expe rienced similiar sedimentation but different in the thickness of the overlying sequences. It is revealed that a secondary evolution of hydrocarbon generation did occur in the Carboniferous -Permian coal series within the area. Preliminarily the depth for the hydrocarbon generation threshold is defined at 3400m, and the initial expulsion at 4000m deep. The author believes that what mentioned above can provide scientific basis for the explorations of gas (oil) pools derived from the secondary evolu tion of coal series.

https://doi.org/10.11781/sysydz1992021781