尕斯库勒渐新统下部油藏原油成因地球化学

doi:10.11743/ogg20040613

摘要/Abstract

摘要：

有机地球化学分析表明,尕斯库勒渐新统下部油藏原油为典型的盐湖相油,既有低熟油特征也有成熟油特征。油源对比表明,尕斯库勒渐新统下部油藏原油主要来自邻区埋深大于3500m的下第三系接近成熟或成熟的烃源岩。下第三系烃源岩形成于高钙多盐、强还原条件下的盐湖环境。烃源岩中盐和高含量的碳酸盐对甾、萜类化合物异构化有明显的抑制作用,导致下第三系烃源岩成熟滞后。尕斯库勒渐新统下部油藏中,目前找到的原油主要为低熟油,未熟油与成熟油发现不多。经分析,成熟的烃源岩分布在埋深大于4000m的深层,因此,深层具有寻找成熟油的潜力。

关键词: 盐湖相, 低熟油, 油气成因, 生物标志物, 地球化学, 尕斯库勒

Abstract:

Organic geochemical analysis shows that oils in the lower Oligocene reservoirs in Gas Hure,western Qaidam basin,are of typical salt lake origin and have the characteristics of both low mature oil and mature oil. Source correlation shows that oils in the lower Oligocene reservoirs in Gas Hure were mainly sourced from the lower Tertiary near mature or mature source rocks buried over 3500m in the adjacent area, which were deposited in salt lakes with high concentration of calcium and salt in strong reducing environment. Salt and high carbonate content in the source rocks significantly inhibited isomerization of steroid and terpenoid, wich would delay the maturation of lower Tertiary source rocks. Oils currently discovered in the lower Oligocene reservoirs in Gas Hure are mainly low mature oil, with rare immature and mature oils. Analysis shows that mature source rocks are mainly distributed in deep layers with a burial depth of over 4000m, thus deep layers would be the potential targets for discovering mature oils.

Key words: salt lake facies, low mature oil, hydrocarbon origin, biomarker, geochemistry, Gas Hure

中图分类号:

TE112.111

李素梅,刘洛夫,王铁冠. 尕斯库勒渐新统下部油藏原油成因地球化学[J]. 石油与天然气地质, 2004, 25(6): 666-670,691. doi: 10.11743/ogg20040613 Li Sumei,Liu Luofu,Wang Tieguan. Geochemical origin of oil in Lower Oligocene reservoirs in Gas Hure,western Qaidam basin[J]. Oil & Gas Geology, 2004, 25(6): 666-670,691. doi: 10.11743/ogg20040613

参考文献

[1] 彭立才,邵文斌,张林,等. 尕斯库勒油田跃灰1井区E23灰层裂缝预测[J].石油与天然气地质, 2003,24(4):391～395
[2] 王铁冠, 钟宁宁, 侯读杰,等.低熟油气形成机理与分布[M]. 北京:石油工业出版社,1995.128～148
[3] 李素梅, 王铁冠, 郑红菊,等.柏各庄凸起原油对比与成因类型[J].现代地质, 1998,12(2):262～268
[4] 朱扬明,苏爱国,梁狄刚,等. 柴达木盆地咸湖相生油岩正构烷烃分布特征及其成因[J].地球化学,2003,32(2):117～123
[5] 庞雄奇,李素梅,黎茂稳,等.八面河地区 "未熟-低熟油"成因探讨[J]. 沉积学报, 2001, 19(4):586～591
[6] Li Sumei, Li Maowen, Pang Xiongqi, et al. Geochemistry of petroleum systems in the Niuzhuang South Slope of Bohai Bay basin-part 1:source rock characterization[J]. Organic Geochemistry, 2003, 34(3):389～412
[7] 李素梅,李雪,张应红,等.东营凹陷牛庄洼陷第三系古沉积环境及其控油气作用[J].石油与天然气地质, 2003, 24(3):269～273
[8] 刘华,蒋有录,杨万琴,等. 东营凹陷中央隆起带油源特征分析[J]. 石油与天然气地质,2004,25(1):39～43
[9] 张俊,庞雄奇,陈冬霞,等.牛庄洼陷砂岩透镜体成藏特征及主控因素剖析[J].石油与天然气地质,2003, 24(3):233～237
[10] 李素梅, 刘洛夫,王铁冠,等.利用非烃技术探讨尕斯库勒油田E13 油藏的充注模式[J]. 地球科学,2001, 26 (6):621～626
[11] 李素梅,庞雄奇,金之钧,等.苏北金湖凹陷混合原油的地质地球化学特征[J].石油大学学报,2002,26(1):12～15
[12] 李素梅, 庞雄奇, 金之钧,等. 济阳坳陷牛庄洼陷南斜坡原油成熟度浅析[J]. 地质地球化学,2002,29(4):50～56
[13] 王文军, 宋宁,姜乃煌, 等.未熟油与成熟油的混源实验、混源理论图版及其应用[J].石油勘探与开发, 1999,26(4):34～37
[14] 黄第藩,张大江,李晋超,等. 柴达木盆地第三系油源对比[J]. 沉积学报,1989, 7(2):1～13
[15] 黄第藩,李晋超,张大江,等.柴达木盆地第三系原油的熟化序列及其在石油资源预测中的重要意义[J]. 石油学报,1989, 10(3):1～11