准噶尔盆地南缘博格达山前带二叠系芦草沟组油气源分析和勘探潜力

Oil and gas source analysis and exploration potential of Permian Lucaogou formationin Bogda piedmont belt in the southern margin of Junggar basin

为了研究准噶尔盆地南缘博格达山前带二叠系芦草沟组的油气来源,分析博格达山前带油气勘探潜力,系统采集了准噶尔盆地南缘博格达山前带新吉参1井和博参1井的烃源岩、天然气和原油样品和邻区主要油气田各层系的烃源岩和原油样品,并利用碳同位素和生物标志化合物技术对研究区油气地球化学特征和来源进行了分析,研究结果清晰显示研究区的原油与该区二叠系芦草沟组烃源岩的饱和烃组成相似,具有较好的亲缘性。同时,其生物标志化合物指标与邻区侏罗系、二叠系、石炭系烃源岩和原油差异明显,综合认为研究区发育自生自储型油气藏,油源来自于二叠系芦草沟组,具有较大勘探潜力。

In order to study the oil and gas source of permian Lucaogou formation in Bogda piedmont belt in the southern margin of Junggar basin and analyze the oil and gas exploration potential of Bogda Piedmont belt,collecting the source rocks,natural gas and crude oil samples of XJC1 well and BC1 well,for Bogda piedmont belt in the southern margin of Junggar basin and the source rocks and crude oil samples of each series of main oil and gas fields in the adjacent area,and using carbon isotope and biomarker compound technology,the geochemical characteristics and sources of oil and gas in the study area are analyzed.The results show that the saturated hydrocarbon composition of the crude oil in the study area is similar to that of the Permian Lucaogou formation source rock,and has good affinity.At the same time,the biomarker indexes are significantly different from the Jurassic,permian and carboniferous source rocks and crude oil in the adjacent area.It is comprehensively considered that the study area develops self generating and self storing oil and gas reservoirs,and the oil source comes from the Lucaogou formation of permian,which has great exploration potential.