地球学报2025，Vol.46Issue(3)：671-682,12.DOI:10.3975/cagsb.2024.120601
北羌塘坳陷夏里组油砂地球化学特征及油源探讨
Geochemical Characteristics and Oil Source Discussion of Xiali Formation Oil Sand Extracts in the Northern Qiangtang Depression
摘要
Abstract
Owing to the problems of low exploration degree,complex oil and gas properties,and unknown oil sources in the Northern Qiangtang Depression,the present study analyzed the oil sands of the Xichangliang,Shenglihe,and Fanghu areas in the south of the Northern Qiangtang Depression.Various analytical methods,such as spatial distribution,family composition,gas chromatography,and chromatography-mass spectrometry were used to identify the origin and source of oil and gas.The results showed that the distribution of the Xiali Formation oil sand extracts is east-west,and its biodegradation degree is in the following order:Xichangliang area>Shenglihe area>Fanghu area.Notably,the oil of the Xiali Formation has reached the mature stage and is primarily derived from the marine sedimentary environment of partial reduction and from the double contribution of lower aquatic organisms and higher terrestrial plants,especially those in the Fanghu area.By comparing the organic geochemical characteristics of the four sets of source rocks of the Xiali,Buqu,Sowa,and Bagong Formations and the oil sand extracts of the Xiali Formation in the Northern Qiangtang Depression,it was concluded that the oil sand extracts of the Xiali Formation in the Xichangliang and Shenglihe areas were primarily derived from the source rocks of the Xiali Formation.In contrast,the oil sand extracts of the Xiali Formation in the Fanghu area are primarily derived from the source rocks of the Bagong Formation.This discovery expands the potential strata of oil and gas exploration in the Northern Qiangtang Depression and provides important guidelines for the Mesozoic oil and gas exploration in the Northern Qiangtang Depression.关键词
北羌塘坳陷/油砂/生物标志化合物/油源对比Key words
Northern Qiangtang Depression/oil sand extract/biomarker/oil-source correlation分类
天文与地球科学引用本文复制引用
黎东玉,唐友军,孙鹏,季长军,梅亚豪,汤思维,韩梦月,陈云..北羌塘坳陷夏里组油砂地球化学特征及油源探讨[J].地球学报,2025,46(3):671-682,12.基金项目
本文由西藏自治区科技计划项目(编号:XZ202401YD0006)和中国地质调查局项目"羌塘盆地战略性矿产调查评价"(编号:DD20230315)联合资助. This study was supported by Science and Tech-nology Plan of Tibet Autonomous Region(No.XZ202401YD0006),and China Geological Survey(No.DD20230315). （编号:XZ202401YD0006）
