| 董国强,牛鹏飞,余君鹏,常小斌,黄增保,吴义布.龙首山西段侏罗系地层原油的首次发现及其生物标志化合物特征与意义[J].甘肃地质,2026,35(3):1-11 |
| 龙首山西段侏罗系地层原油的首次发现及其生物标志化合物特征与意义 |
| FIRST DISCOVERY OF CRUDE OIL IN THE JURASSIC STRATA OF THE WESTERN LONGSHOU MOUNTAIN AND THE CHARACTERISTICS AND SIGNIFICANCE OF IOMARKER COMPOUNDS |
| |
| DOI： |
| 中文关键词: 原油 生物标志化合物 侏罗系 逆冲推覆体 龙首山西段 |
| 英文关键词:crude oil biomarker compounds Jurassic thrust nappe the western Longshou Mountain |
| 基金项目:甘肃省省级基础地质调查项目（甘国土资勘发［2017］64 号）；甘肃省地质勘查基金（202203-D01）。 |
| 作者 | 单位 | | 董国强 | 甘肃省地质调查院,甘肃 兰州,730020 | | 牛鹏飞 | 甘肃省地质调查院,甘肃 兰州,730020 | | 余君鹏 | 甘肃省地质调查院,甘肃 兰州,730020 | | 常小斌 | 甘肃省地质调查院,甘肃 兰州,730020 | | 黄增保 | 甘肃省地质调查院,甘肃 兰州,730020 | | 吴义布 | 甘肃省地质调查院,甘肃 兰州,730020 |
|
| 摘要点击次数: 15 |
| 全文下载次数: 2 |
| 中文摘要: |
| 笔者在龙首山西段新发现1处高品位原油，这是该地区原油的首次发现。 基于气相色谱—质谱，分析了原油的生物标志化合物。 结果表明：（1）原油饱和烃、芳烃、沥青含量为70. 59％ ～ 91. 90%，含油饱和度为16. 57％ ～
72. 95%，显示原油品质好；（2）原油正构烷烃轻重比∑C21- ／∑C22+较小，规则甾烷相对组成呈反“L” 型分布，萜烷化合物参数C23TT ／ C21TT比值大于1，显示母源输入主要为陆源高等植物和低等水生生物混合型；（3）原油的姥植比（Pr ／ Ph）较低，原油母质岩沉积环境为还原—弱还原环境；（4）原油甾烷成熟度参数C29 ααα-20S ／ 20（S + R）与C29 ββ ／ （ββ +αα）平均值分别为0. 26和0. 33，Ts／ Tm比值整体较低，原油成熟度偏低。 因此，龙首山西部侏罗系地层原油具混源、多源特征，混源原油生物标志化合物信息与青土井组烃源岩有很大的相似性。 另外，此处原油的发现为潮水—酒东一带油气勘查提供新的地域和方向，这将开启河西走廊盆地群原油成藏的新认识。 |
| 英文摘要: |
| During a geological survey in the western section of Longshou Mountain, A high-grade crude oil occurrence was newly discovered—the first such discovery in this region. This study, based on field geological investigations, analyzed the crude oil group composition and oil saturation of samples collected from drill holes.Using Gas Chromatography -Mass Spectrometry （GC -MS ）, the biomarker compounds in the crude oil were examined to interpret their geological implications regarding organic matter source, depositional environment, and maturity. The results indicate: （1） The contents of saturated hydrocarbons, aromatic hydrocarbons, and asphaltenes in the crude oil range from 70. 59% to 91. 90%, with oil saturation between 16. 57% and 72. 95%,indicating high oil quality. （2） The light -to -heavy alkane ratio ∑C21 - ／ ∑C22 ＋ is relatively low; the relative composition of regular steranes shows an inverted “L” type distribution; and the terpanoid parameter C23TT ／ C21TT is greater than 1. Combined with relevant discrimination diagrams, these features suggest that the organic matter input was mainly mixed, derived from terrestrial higher plants and aquatic lower organisms. （3） The pristane ／ phytane （Pr ／ Ph） ratio is low. This indicates that the source rock was deposited in a reducing to weakly reducing environment. （4） The sterane maturity parameters C29ααα－20S ／ 20（S + R） and C29ββ ／ （ββ + αα） have average values of 0. 26 and 0. 33,respectively, while the Ts／ Tm ratio is generally low. These values, along with relevant diagrams, suggest that the crude oil has relatively low maturity. In conclusion, the crude oil from the Jurassic
strata in the western Longshou Mountain exhibits mixed and multi -source characteristics. The biomarker signatures show strong similarities with those of source rocks from the Qingtujing Formation. Furthermore, the discovery of both crude oil and Jurassic reservoirs implies the presence of a previously unidentified sedimentary basin in the northwestern part of the Chaoshui Basin. This finding provides new target areas and directions for oil and gas exploration in the Chaoshui-Jiudong region. The discovery of this crude oil opens new perspectives on
hydrocarbon accumulation in the Hexi Corridor basin group. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
