倪丘集凹陷煤成油的判识和来源

THE DISCRIMINATION AND SOURCE OF COAL-FORMED OIL IN NIQIUJI SAG

韩云生

Han Yunsheng

河淮盆地已在几个地点发现原油显示。倪丘集凹陷南11井原油呈褐黄色,有芳香味,易挥发,产于下第三系双浮组和二叠系上石盒子组断层带的裂隙和方解石脉晶洞中。查明该原油的来源,是本区油气普查工作急需解决的问题。本文综合应用生物标记化合物、碳同位素和地质资料,初步确定原油来自石炭二叠纪煤系。

Crude oil is discovered in fractures and miarolities of calcite vein in wellNan-11 of the Niqiuji sag in the Ruanghe-Huaihe Basin. The Pr/Ph-value ofthe crude oil is 2.28-2.60. the C/C-value of ααα20R sterane is 0.37-0.31,the major peak carbon of saturated hydrocarbon is C, and the δC-values ofaromatic hydrocarbon range from -27.56 to -28.14%. It is inferred that thecrude oil may come from the coal measure of the Carboniferous-Permian but notLower Cretaceous mudstone.

10.11743/ogg19870423