准噶尔盆地西北缘超剥带轻质油的发现及意义

发布时间：2018-01-07 15:28

本文关键词：准噶尔盆地西北缘超剥带轻质油的发现及意义　出处：《地质通报》2017年04期 　论文类型：期刊论文

【摘要】：含油气盆地超剥带的勘探以重质油-油砂为主。在准噶尔盆地西北缘超剥带的中生代油砂中发现了轻质油,报道了其基本特征与成藏模式,并探讨了勘探意义。结果表明,轻质油呈黄绿色荧光,与呈黄褐色荧光的重质油共生。油砂连续抽提发现,重质油充注在前(颗粒吸附烃/包裹体烃),轻质油充注在后(孔隙游离烃),油源均来自研究区玛湖凹陷下二叠统风城组,典型生标特征为Pr/Ph值小于1,伽马腊烷/C_(30)藿烷为0.43~0.82,C_(20)、C_(21)、C_(23)三环萜烷呈上升型分布。油砂无机地球化学研究发现,2期原油充注明显,形成了2期方解石胶结物,早期MnO和FeO含量在1%~1.5%之间,晚期大于1.5%。白垩纪前,风城组生源成熟油在充注过程中遭受降解,形成重质油-油砂;白垩纪至今,风城组生源高熟轻质油沿横断裂直接运移至超剥带,在断裂"纵横交叉"之处最富集。据此认为,研究区横断裂沿线是这类轻质原油勘探值得考虑的领域。超剥带的勘探可能不仅局限于传统认为的重质油-油砂,若存在有利的成藏条件,亦有可能形成轻质油气的聚集。
[Abstract]:Heavy oil and oil sand are the main exploration methods in the oil and gas bearing basin. Light oil was found in the Mesozoic oil sand in the super-stripping zone in the northwestern margin of Junggar Basin, and its basic characteristics and reservoir forming model were reported. The results show that the light oil is yellowish green and symbiotic with the heavy oil with yellow-brown fluorescence. The continuous extraction of oil sand shows that the heavy oil is filled before (particle adsorbed hydrocarbon / inclusion hydrocarbon). The light oil is filled in the hind (pore free hydrocarbon) and the oil source is from the Fengcheng formation of Lower Permian in Mahu Sag of the study area. The typical Pr/Ph value is less than 1. The ratio of gammarin / Che 30) is 0.43 ~ 0.82C ~ (+) C _ (20) C _ (21) C _ (T _ (23)) trichloroterpene is in an ascending distribution. The inorganic geochemical study of oil sands shows that the trichloroterpene is distributed in an ascending pattern. During the second period, the calcite cementation was formed. The contents of MnO and FeO were between 1.5% and 1.5% in the early stage and more than 1.5% in the late stage. The mature source oil of Fengcheng formation was degraded during filling and formed heavy oil-oil sand. From the Cretaceous to the present, the high mature light oil of Fengcheng formation is transported directly along the transverse fault to the super-strip zone, which is the most abundant in the "vertical and horizontal intersection" of the fault. The horizontal fault along the studied area is the area to be considered for the exploration of this kind of light crude oil. The exploration of the overstripping zone may not only be limited to the traditional heavy oil-oil sand, if there are favorable reservoir forming conditions. It is also possible to form the accumulation of light oil and gas.
【作者单位】：南京大学地球科学与工程学院;中国石油新疆油田分公司实验检测研究院;
【基金】：科技部国家油气重大专项《准噶尔前陆冲断带油气成藏关键勘探技术与新领域目标优选》(编号:2016ZX05003-005)
【分类号】：P618.13
【正文快照】： 1.南京大学地球科学与工程学院,江苏南京210023;2.中国石油新疆油田分公司实验检测研究院,新疆克拉玛依8340001.School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,Jiangsu,China;2.Research Institute of Experiment and Testing,Petro China Xin

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