济阳拗陷上古生界煤系成烃潜力研究

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

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。

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.