CAJ | 학술논문

在内蒙古突泉盆地牤牛海坳陷南部突参1井的1684.5~1698.2m深度段侏罗系万宝组发现轻质原油,揭示了该区较好的油气勘探新领域.对该井原油和主要烃源岩分子地球化学特征、族组分稳定C同位素等进行了分析认为,该原油为轻质高蜡原油,C31升藿烷、C29甾烷异构化等成熟度参数显示该原油为成熟原油.正构烷烃呈单峰前峰型,姥鲛烷较植烷占绝对优势(Pr/Ph>2.5),C29规则甾烷含量远高于C27甾烷,伽马蜡烷含量低,表明该原油生烃母质形成于以陆源高等植物为主的偏氧化沉积环境,原油来自该区侏罗系万宝组煤系泥岩.
재내몽고돌천분지망우해요함남부돌삼1정적1684.5~1698.2m심도단주라계만보조발현경질원유,게시료해구교호적유기감탐신영역.대해정원유화주요경원암분자지구화학특정、족조분은정C동위소등진행료분석인위,해원유위경질고사원유,C31승곽완、C29치완이구화등성숙도삼수현시해원유위성숙원유.정구완경정단봉전봉형,모교완교식완점절대우세(Pr/Ph>2.5),C29규칙치완함량원고우C27치완,가마사완함량저,표명해원유생경모질형성우이륙원고등식물위주적편양화침적배경,원유래자해구주라계만보조매계니암.
Light crude oil was found at the depths of 1684.5~1698.2m of the Middle Jurassic Wanbao Formation in Well Tucan 1, which was deployed in the southern part of Mangniuhai depression in Tuquan Basin. The oil discovery reveals a better new field of oil and gas exploration in the area. The molecular geochemical characteristics and stable carbon isotopic group components of the crude oil and the main hydrocarbon source rocks were analyzed in the paper. The crude oil is light and high wax oil. The maturity parameters of C31-hopane and C29-sterane isomerization show that the crude oil is a mature crude oil. N-alkanes occur as single and front peak type. Pristines occupy absolute advantage compared with phytane (Pr/Ph>2.5). The content of C29-sterane is much higher than C27-sterane. The content of gammacerane is low. These features indicate that the oil organic matter was mainly derived from terrestrial higher plant in a partially oxidized sedimentary environment. The crude oil came from the coal shale of Jurassic Wanbao Formation.