凯里-麻江地区油苗与固体沥青的油源分析

对黔南坳陷典型古油藏、残余油气藏的精细解剖对南方海相碳酸盐岩层系油气勘探研究具有重要意义。本文运用碳同位素、饱和烃色谱、饱和烃色质及芳烃色质等技术,对黔东南地区二叠系—寒武系油苗与固体沥青进行了地球化学特征研究和油源分析。研究表明,凯里地区虎庄47井原油、洛棉志留系砂岩油苗和麻江地区奥陶系红花园组固体沥青三者同源,主要来自下寒武统牛蹄塘组的优质烃源岩。而麻江地区早二叠世茅口组油苗与虎庄47井原油明显不同,主要源于下二叠统栖霞组的优质烃源岩。

Oil Source of Oil Seepage and Solid Bitumen in the Kaili-Majiang Area

Detailed research of typical paleo-reservoir and remnant oil/gas reservoir in the depression of southern Guizhou bears great significance in exploration of sea-facies carbonate layers.This paper analyzed geochemistry and oil source of Cambrian-Permian oil seepage and solid bitumen in the region of southeast Guizhou by using carbon isotope,saturated hydrocarbon chromatography,saturated hydrocarbon GC-MS,and aromatic hydrocarbon GC-MS.The results indicated that No.47 oil well at Huzhuang and oil seepage hosted in the Silurian sandstone at Luomian as well as the slid bitumen of Ordivician O1h member in the Majiang area are of the same oil source,mainly originating from high-quality hydrocarbon source rocks of the Lower-Cambrian Niutitang Formation,while the oil seepage of P1m in Majiang is obviously different from that of No.47 oil well at Huzhuang,it comes mainly from the high-quality hydrocarbon source rocks of the Lower-Permian Qixia Formation.