济阳拗陷上古生界煤系成烃潜力研究

济阳拗陷是我国重要的油气生产基地,目前已在沾化凹陷义155井、惠民凹陷曲古1井发现煤成气藏,虽未形成工业规模的气田,但展示了煤成气良好的勘探前景。研究表明,济阳地区石炭-二叠纪煤层总残厚一般为10~30 m,煤层平均厚为16.75 m,最大残厚为40.5 m,最小为4.5 m。结合镜质组反射率研究和EASY%Ro法反演,提出济阳拗陷煤系的镜质组反射率值多处于0.6~2.0,属成熟—高成熟阶段,但各次级凹陷生烃率差距较大。综合研究表明,在沾化凹陷的孤岛—孤南地区,东营凹陷临近青城突起地区及惠民凹陷的中—南坡地区将是很有利的煤成烃地区。

Study on Hydrocarbon-forming Potentiality in Upper Part of Palaeozoic Coal System in Jiyang Depression

Jiyang depression is an important base area of producing oil and gas.Now gas pools have been found in Yi-155 well at Zhanhua depression and No.1 Qugu well at Huimn depression,which show good future in exploring gas resource.As showed by the study,remaining depths of coal in Carbonate and Permian are 10~30m,average depth is 16.75m,the maximum depth is 40.5m,and the minimum depth is 4.5m.Combining vitrinite reflectance and conversion by EASY%Ro method,it is put forward that vitrinite reflectance value in Jiyang depression is 0.6~2.0 in general which belongs to mature and overmature stage.But the gap of hydrocarbon-forming ratios in each class secondary depression is great.Through synthetic analysis,it is showed that Gudao-Gunan area at Zhanhua depression,the areas near Qingcheng rais at Dongying depression and the central and southern areas at Huimin depression are good areas for forming gas.