藏北羌塘盆地井下布曲组含油白云岩地球化学特征及其意义

发布时间：2018-01-23 05:16

本文关键词： 生物标志化合物含油白云岩布曲组油-岩对比羌塘盆地　出处：《地质通报》2017年04期 　论文类型：期刊论文

【摘要】：羌资11、12井是羌塘盆地揭示隆鄂尼-昂达尔错古油藏展布规律的资料井。对这2口钻井揭示的含油岩层进行取样分析,结合前人该区石油地质调查报告中羌资2井布曲组、夏里组及曲色组烃源岩的分析数据,从类异戊二烯烃、甾烷、萜烷等系列生物标志化合物参数方面进行油-岩对比研究。研究表明,羌资11、12井揭示的原油为同一种类型,但11井原油生物降解程度强于12井。各原油的母质主要来源于低等水生生物和藻类;各原油的母质形成于还原-弱还原、盐度值不高的咸水环境。原油中类异戊二烯烃、萜烷、甾烷等生物标志化合物参数与羌资2井布曲组泥晶灰岩与夏里组和曲色组烃源岩之间具有较好的亲缘性。结合南羌塘地区烃源岩有机碳资料,油源可能主要来自于曲色组,混入了部分夏里组及布曲组的油源,具有混源的特征。该研究结果对下一步油气勘探具有一定的指导意义。
[Abstract]:Qiangzi 11yun12 well is a data well in Qiangtang Basin to reveal the distribution law of Long-Ondaho ancient reservoir. The oil-bearing strata revealed by these two drilling wells are sampled and analyzed. Based on the analysis data of source rocks of Qiangzi 2 well Buqu formation, Xiali formation and Kochsia formation in the previous petroleum geological survey in this area, isoprene hydrocarbon and sterane were analyzed from the source rocks. The oil-rock correlation study on the parameters of series of biomarkers such as terpene alkanes shows that the crude oil revealed in Qiangzi 11yun12 well is of the same type. However, the biodegradation of crude oil in well 11 is stronger than that in well 12. The source material of each crude oil is mainly from low aquatic organisms and algae. The parent material of each crude oil is formed in the saltwater environment of reduction-weak reduction and low salinity. Isoprene hydrocarbon and terpene in crude oil. The parameters of sterane and other biomarkers are closely related to the mudstone of Qiangzi 2 well Buqu formation and the source rocks of Xiali formation and qu color formation. The organic carbon data of source rocks in South Qiangtang area are combined. The oil source may mainly come from the curved color formation, mixed with some oil sources of Xiali formation and Buqu formation, and has the characteristics of mixed source. The results of this study are of certain guiding significance for oil and gas exploration in the next step.
【作者单位】：中国地质大学(武汉)地球科学学院;中国地质科学院;中国地质调查局成都地质调查中心沉积地质研究室;
【基金】：国家自然科学基金项目《羌塘盆地海相油页岩:沉积环境、古气候及源区》(批准号:41172098) 中国地质调查局项目《羌塘盆地金星湖—隆鄂尼地区油气资源调查》(编号:DD20160159)
【分类号】：P618.13
【正文快照】： 1.中国地质大学(武汉)地球科学学院,湖北武汉430074;2.中国地质科学院,北京100037;3.中国地质调查局成都地质调查中心沉积地质研究室,四川成都6100811.School of Earth Sciences,China University of Geosciences,Wuhan 430074,Hubei,China;2.Chinese Academy of Geological S

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