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
计量
- 文章访问数: 1561
- HTML全文浏览量: 53
- PDF下载量: 684
- 被引次数: 0
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

HTML全文

参考文献(26)

[1]	刘高波,施泽进,佘晓宇,等.巴楚—麦盖提的区域构造演化与油气分布规律[J].成都理工大学学报:自然科学版,2004,31(2):157-161.
[2]	邵志兵,吕海涛,耿锋,等.塔里木盆地麦盖提地区石炭系油藏地球化学特征[J].石油与天然气地质,2010,31(1):84-90.
[3]	赵斌,邓炜.西北油田麦盖提斜坡油气前景 [J].科技创新导报,2011(14):60.
[4]	包建平,张功成,朱俊章,等.渤中凹陷原油生物标志物特征与成因类型划分[J].中国海上油气地质,2002,16(1):11-18.
[5]	Peters K E,Moldowan M.The Biomarker guide: Interpreting molecular fossils in petroleum and ancient sediments[M].New Jersey:Prentice Hall Inc,1993.
[6]	胡守志,李水福,张冬梅,等.原油中难以分辨的复杂混合物研究进展[J].石油实验地质,2011,33(3):292-296.
[7]	倪春华,徐良发,周小进,等.南华北盆地谭庄凹陷巴1井原油地球化学特征及成藏条件[J].石油实验地质,2012,34(5): 481-485.
[8]	白森舒,周小进,倪春华,等.南华北盆地谭庄凹陷巴1井下白垩统原油成因及地质意义[J].石油实验地质,2011,33(6):634-638.
[9]	Mango F D.The origin of light cycloalkanes in petroleum[J].Geochimica et Cosmochimica Acta,1990,54(1):23-27.
[10]	Thompson K F M.Light hydrocarbons in subsurface sediments[J].Geochimica et Cosmochimica Acta,1979,43(5):657-672.
[11]	赵孟军,张宝民,边立曾,等.奥陶系类Ⅲ型烃源岩及其生成天然气的特征[J].科学通报,1999,44(21):2333-2336.
[12]	Philp R P,Fan P,Lewis C A,et al.Geochemical characteristics of oils from the Chaidamu,Shanganning and Jianghan Basins,China[J].Journal of Southeast Asian Earth Sciences,1991,5(3):351-358.
[13]	Palscas J G.Petroleum geochemistry and source rock potential of carbonate rocks[J].AAPG Studies in Geology,1984,18:150-152.(上接第324页)
[14]	Moldowan J M,Seifert W K,Gallegos E J.Relationship between petroleum composition and depositional environment of petroleum source rocks[J].AAPG Bulletin,1985,69(8):1255-1268.
[15]	程克明,王兆云,钟宁宁,等.碳酸盐岩油气生成理论与实践[M].北京:石油工业出版社,1996.
[16]	黄继文.塔里木盆地塔河油区原油生物标志化合物在运移方面的应用探讨[J].石油实验地质,2003,25(增刊):573-577.
[17]	王春江,傅家谟,盛国英,等.18a(H)-新藿烷及17a(H)-重排藿烷类化合物的地球化学属性与应用[J].科学通报,2000,45(13):1366-1372.
[18]	Kolaczkowska E,Slougui N E,Watt D S,et al.Thermodynamic stability of various alkylated,dealkylated,and rearranged 17a- and 17b-hopane isomers using molecular mechanics calculations[J].Org Geochem,1990,16:1033-1038.
[19]	陈致林,李素娟,王忠,等.低-中成熟演化阶段芳烃成熟度指标的研究[J].沉积学报,1997,15(2):192-197.
[20]	林壬子,王培荣,藏允键,等.矿物燃料中多环芳烃的石油地球化学意义//中国地质学会石油地质专业委员会.有机地球化学论文集.北京:地质出版社,1987:120-140.
[21]	贾存善,王延斌,顾忆,等.塔河油田奥陶系原油芳烃地球化学特征[J].石油实验地质,2009,31(4):384-388.
[22]	米敬奎,张水昌,陈建平,等.塔北地区原油碳同位素组成特征及影响因素[J].石油勘探与开发,2010,37(1):21-25.
[23]	包建平,朱翠山,张秋茶,等.库车坳陷前缘隆起带上原油地球化学特征[J].石油天然气学报,2007,29(4):40-44.
[24]	王传刚,王铁冠,何发歧,等.塔河油田原油稳定碳同位素特征及其成藏意义[J].新疆石油地质,2005,26(2):155-157.
[25]	朱俊章,包建平.塔里木盆地寒武系—奥陶系海相烃源岩地球化学特征[J].海相油气地质,2000,5(3/4):55-59.
[26]	马安来,金之钧,张水昌,等.塔里木盆地寒武系—奥陶系烃源岩的分子地球化学特征[J].地球化学,2006,35(6):593-601.