塔里木盆地玉北地区奥陶系原油成因特征分析

路清华; 邵志兵; 贾存善; 岳勇; 刘少杰

doi:10.11781/sysydz201303320

塔里木盆地玉北地区奥陶系原油成因特征分析

doi: 10.11781/sysydz201303320

1.
中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2. 中国石油化工股份有限公司西北油田分公司石油勘探开发研究院, 乌鲁木齐 830011

基金项目: 中国石油化工股份有限公司科技开发部项目"巴麦地区古生界油气成藏条件与勘探方向"(P10023)资助.

详细信息

作者简介:
路清华(1981- ),女,硕士,工程师,从事油气地球化学研究工作.E-mail:luqh.syky@sinopec.com.

中图分类号: TE122.1⁺14
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出版历程
- 收稿日期: 2012-08-19
- 修回日期: 2013-03-21
- 刊出日期: 2013-05-28

Genesis features of crude oil in Ordovician, Yubei area, Tarim Basin

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2. Research Institute of Petroleum Exploration and Production, SINOPEC Northwestern Oilfield Company, Urumqi, Xinjiang 830011, China

摘要

摘要: 玉北地区鹰山组原油为低凝固点、含硫、高蜡的中质油,饱和烃色谱正构烷烃分布完整,但色谱基线出现不同程度抬升,且原油非烃和沥青质碳同位素偏轻,族组分碳同位素发生倒转,表明该区原油经历了至少2期成藏过程,早期充注原油遭受生物降解作用后又与后期充注的高成熟原油相混合.地化分析主要表现为后期充注原油特征:弱植烷优势(Pr/Ph≤1.0),较高含量的伽马蜡烷(G/C₃₀藿烷为0.24~0.4)及C₃₅升藿烷/C₃₄升藿烷＞1.0的"翘尾巴式"特征,表明后期原油主要来源于还原—强还原生烃环境;正庚烷含量为46.47%~48.57%,C₂₃-三环萜烷优势,较高的三环萜烷/藿烷,指示其生油母质为菌藻类;较高的庚烷值及四甲基萘指数表明原油处于高成熟演化阶段,推测来源于寒武系烃源岩.
- 碳同位素 /
- 轻烃 /
- 生物标志化合物 /
- 地球化学 /
- 奥陶系 /
- 玉北地区 /
- 塔里木盆地
Abstract: The Ordovician oil in Yubei area has middle density,low freezing point and high waxy content.The distribution of normal alkane is complete while the baseline of saturated hydrocarbon chromatogram shows various degrees of excursion.It shows upside-down phenomenon that the δ¹³C value of nonhydrocarbon and asphaltene is smaller than that of saturated and aromatic hydrocarbon.All of these indicate that the reservoir underwent no less than two periods of oil charging.The early charging oil experienced strong biodegradation and mixed with the later higher mature charging oil.Geochemical properties are mainly attributed to the late charging oil with weak phytane predominance (Pr/Ph≤1.0),abundance of gammacerne (G/C₃₀-hopanes 0.14-0.24),and higher C₃₅-hopane/ C₃₄-hopane value (>1.0) characteristics,showing reduction-strong reduction sedimentary environment.The predominance of n-heptane (46.47%-48.57%),and C₂₃-tricyclic terpane and higher tricyclic terpane/hopane indicate that the original source materials of later oil are homonemeaes.High heptane value and tetramethylnaphthalene index suggest that the oil is in high mature stage and probably generated from the Cambrian source rock.
- carbon isotope /
- light hydrocarbon /
- biomarker /
- geochemistry /
- Ordovician /
- Yubei area /
- Tarim Basin

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