Geochemical characteristics and genetic analysis of crude oils in Mosuowan area, Junggar Basin
-
摘要: 为明确准噶尔盆地莫索湾地区原油成因及影响原油性质差异的控制因素,揭示研究区油气成藏规律,开展了原油饱和烃生物标志物和单体烃碳同位素组成分析,以及混源油模拟配比实验。莫索湾地区盆5井区原油碳同位素偏重,Pr/Ph值更大(1.4~1.9),金刚烷异构化指标偏高,说明盆5井区原油成熟度高于盆参2井区原油,且水体沉积环境更偏氧化性。莫索湾地区原油C7轻烃以甲基环己烷组分占优势,含量大于40%,ααα构型的规则甾烷分布中均以C29规则甾烷含量占优势,相对含量大于40%,表明其生烃母质均以陆相偏腐殖型为主。盆5井区和盆参2井区原油正构烷烃碳同位素值组成及分布曲线基本相同,表明其来源整体一致,且与典型下乌尔禾组烃源岩整体较为相似;但下乌尔禾组烃源岩不同碳数正构烷烃碳同位素值跨度较大,达4.6‰,而莫索湾地区原油中不同碳数正构烷烃碳同位素值跨度有所差异,分布在2.2‰~3.0‰之间,认为主要是不同期次充注原油比例不同造成的。混源油生物标志物定量计算结果表明,莫索湾地区原油主要来源于晚期高成熟下乌尔禾组烃源岩,混有早期成熟风城组烃源岩贡献,其中,盆5井区和盆参2井区原油中高成熟下乌尔禾组烃源岩贡献分别大于80%和60%。混源比例不同是造成莫索湾地区不同区域原油地球化学特征表现差异的主要原因。Abstract: Analysis of the biomarkers of saturated hydrocarbon and related compound specific carbon isotopes of crude oils were carried out for the research of origin of oils and controlling factors of oil properties in the Mosuowan area of the Junggar Basin, and mixed-source oil simulation was also carried out to reveal hydrocarbon accumulation in the study area. The carbon isotope of crude oil in the Pen 5 well block is relatively heavy, the Pr/Ph value is higher, between 1.4 and 1.9, and the index of adamantane isomerization is greater, indicating that the oil maturity of the Pen 5 well block is higher than that of the Pencan 2 well and had a more oxidative sedimental environment. The C7 light hydrocarbons of oil of the Mosuowan area are dominated by methylcyclohexane, with a content over 40%, and the distributions of regular steranes are dominated by C29 homologues with a content over 40%. Crude oils in the study area are thus indicated to be generated from terrestrial partial humus source rocks. The carbon isotope compositions and distribution of n-alkanes in the Pen 5 and Pencan 2 well blocks are similar, indicating that they were from the comparable sources, and they are generally similar to the source rocks in the Lower Wuerhe Formation. But the carbon isotope values of n-alkanes with different carbon numbers in the source rocks of the Lower Wuerhe Formation have a large span, reaching 4.6‰, while the carbon isotope values of n-alkanes with different carbon numbers of crude oil in the Mosuowan area have a smaller span, between 2.2‰ and 3.0‰. It is mainly caused by the different mixing ratio of crude oil. The quantitative calculation results of biomarkers in mixed-source oil showed that crude oil in the Mosuowan area was mainly derived from the late high-maturity source rocks in the Lower Wuerhe Formation, mixed with those from the early mature source rocks in the Fengcheng Formation. Among them, the high-maturity source rocks in the Lower Wuerhe Formation have a relatively greater contribution to crude oil in the Pen 5 well block, around 80%, and contribute about 60% to crude oil in the Pencan 2 well block. As a result, it is concluded that different proportions of mixed sources are the main reason which caused differences in the geochemical characteristics of crude oil in the Mosuowan area.
-
图 5 准噶尔盆地莫索湾地区原油金刚烷异构化指标(a, b)和浓度指标(c, d)
DMAI-1=1,3-二甲基单金刚烷/(1,3-二甲基单金刚烷+1, 2-二甲基单金刚烷);MAI=1-甲基单金刚烷/(1-甲基单金刚烷+2-甲基单金刚烷);MDI=4-甲基双金刚烷/(4-甲基双金刚烷+1-甲基双金刚烷+3-甲基双金刚烷);EAI=1-乙基单金刚烷/(1-乙基单金刚烷+2-乙基单金刚烷);A为单金刚烷含量;1-MA为1-甲基单金刚烷含量;1,3-DMA为1,3-二甲基单金刚烷含量;MAs为甲基单金刚烷类总含量;DMAs为二甲基单金刚烷类总含量
Figure 5. Adamantane isomerization index (a, b) and concentration index (c, d) of crude oil in Mosuowan area, Junggar Basin
表 1 准噶尔盆地莫索湾地区混源油比例判识参数
Table 1. Identification parameters of mixed-source oil ratio in Mosuowan area, Junggar Basin
μg/g 判识参数 判识项目 混源比例(成熟P1f∶高成熟P2w) 10∶0 0∶10 8∶2 6∶4 4∶6 2∶8 β-胡萝卜烷 盐度 1 910.70 181.57 1 424.41 1 082.41 617.37 522.54 伽马蜡烷 盐度/分层 194.35 17.08 114.67 99.47 54.88 41.44 γ-胡萝卜烷 盐度 566.84 69.72 372.78 315.98 206.41 139.45 25-降藿烷 降解 71.61 0 43.11 34.94 20.61 17.08 Tm 成熟度 200.91 8.48 136.97 109.26 69.27 47.74 C30藿烷 母质类型 647.36 51.80 499.38 364.15 234.64 177.34 注:成熟P1f来源油采自基003井;高成熟P2w来源油采自前哨1井。 -
[1] 麻伟娇, 卫延召, 李霞, 等. 准噶尔盆地腹部中浅层远源、次生油气藏成藏过程及主控因素[J]. 北京大学学报(自然科学版), 2018, 54(6): 1195-1204. https://www.cnki.com.cn/Article/CJFDTOTAL-BJDZ201806008.htmMA Weijiao, WEI Yanzhao, LI Xia, et al. Accumulation process and control factors of Jurassic-Cretaceous distant-source and secondary-filled reservoirs in the hinterland of Junggar Basin[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2018, 54(6): 1195-1204. https://www.cnki.com.cn/Article/CJFDTOTAL-BJDZ201806008.htm [2] 况军, 何登发, 张年富, 等. 准噶尔盆地莫索湾凸起油气成藏模式[J]. 中国石油勘探, 2005, 10(1): 40-45. https://www.cnki.com.cn/Article/CJFDTOTAL-KTSY200501005.htmKUANG Jun, HE Dengfa, ZHANG Nianfu, et al. Oil and gas migration and accumulation pattern of Mosuo Bay Uplift in Junggar Basin[J]. China Petroleum Exploration, 2005, 10(1): 40-45. https://www.cnki.com.cn/Article/CJFDTOTAL-KTSY200501005.htm [3] 陶国亮, 胡文瑄, 曹剑, 等. 准噶尔盆地腹部二叠系混源油油源组成与聚集特征研究[J]. 南京大学学报(自然科学), 2008, 44(1): 42-49. https://www.cnki.com.cn/Article/CJFDTOTAL-NJDZ200801004.htmTAO Guoliang, HU Wenxuan, CAO Jian, et al. Source composition and accumulation characteristics of Permian mixed oils in central Junggar Basin, NW China[J]. Journal of Nanjing University(Natural Sciences), 2008, 44(1): 42-49. https://www.cnki.com.cn/Article/CJFDTOTAL-NJDZ200801004.htm [4] 石新朴, 王绪龙, 曹剑, 等. 准噶尔盆地莫北—莫索湾地区原油成因分类及运聚特征[J]. 沉积学报, 2010, 28(2): 380-387. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB201002022.htmSHI Xinpu, WANG Xulong, CAO Jian, et al. Genetic type of oils and their migration/accumulation in the Mobei-Mosuowan area, central Junggar Basin[J]. Acta Sedimentologica Sinica, 2010, 28(2): 380-387. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB201002022.htm [5] 姜林, 吴孔友, 曲江秀. 准噶尔盆地莫索湾地区油源分析[J]. 西安石油大学学报(自然科学版), 2005, 20(2): 25-27. https://www.cnki.com.cn/Article/CJFDTOTAL-XASY200502006.htmJIANG Lin, WU Kongyou, QU Jiangxiu. Analysis of the oil source in Mosuowan area of Zhungeer Basin[J]. Journal of Xi'an Shiyou University (Natural Science Edition), 2005, 20(2): 25-27. https://www.cnki.com.cn/Article/CJFDTOTAL-XASY200502006.htm [6] 薄冬梅, 姜林, 曲江秀. 准噶尔盆地莫索湾地区原油运移研究[J]. 中国石油大学学报(自然科学版), 2007, 31(4): 18-23. https://www.cnki.com.cn/Article/CJFDTOTAL-SYDX200704005.htmBO Dongmei, JIANG Lin, QU Jiangxiu. Study on oil migration in Mosuowan area of Junggar Basin[J]. Journal of China University of Petroleum, 2007, 31(4): 18-23. https://www.cnki.com.cn/Article/CJFDTOTAL-SYDX200704005.htm [7] 唐勇, 徐洋, 瞿建华, 等. 玛湖凹陷百口泉组扇三角洲群特征及分布[J]. 新疆石油地质, 2014, 35(6): 628-635. https://www.cnki.com.cn/Article/CJFDTOTAL-XJSD201406003.htmTANG Yong, XU Yang, QU Jianhua, et al. Fan-delta group characteristics and its distribution of the Triassic Baikouquan reservoirs in Mahu Sag of Junggar Basin[J]. Xinjiang Petroleum Geology, 2014, 35(6): 628-635. https://www.cnki.com.cn/Article/CJFDTOTAL-XJSD201406003.htm [8] 彭兴芳, 李周波. 生物标志化合物在石油地质中的应用[J]. 资源环境与工程, 2006, 20(3): 279-283. https://www.cnki.com.cn/Article/CJFDTOTAL-HBDK200603016.htmPENG Xingfang, LI Zhoubo. The application of biomarker in the research of petroleum geology[J]. Resources Environment & Engineering, 2006, 20(3): 279-283. https://www.cnki.com.cn/Article/CJFDTOTAL-HBDK200603016.htm [9] 王铁冠. 生物标志物地球化学研究[M]. 武汉: 中国地质大学出版社, 1990.WANG Tieguan. Study on biomarkers geochemistry[M]. Wuhan: China University of Geosciences Press, 1990. [10] 徐冠军, 帅燕华, 王培荣, 等. 姥鲛烷、植烷立体异构体的色谱分离及地球化学意义[J]. 地球化学, 2010, 39(5): 491-496. https://www.cnki.com.cn/Article/CJFDTOTAL-DQHX201005009.htmXU Guanjun, SHUAI Yanhua, WANG Peirong, et al. Chromatographic separation of pristane and phytane stereoisomers and its geochemical significance[J]. Geochimica, 2010, 39(5): 491-496. https://www.cnki.com.cn/Article/CJFDTOTAL-DQHX201005009.htm [11] 李二庭, 陈俊, 于双, 等. 生物降解稠油中沥青质热模拟实验[J]. 新疆石油地质, 2017, 38(5): 580-585. https://www.cnki.com.cn/Article/CJFDTOTAL-XJSD201705013.htmLI Erting, CHEN Jun, YU Shuang, et al. Thermal simulation experiment on asphaltene in biodegraded heavy oil[J]. Xinjiang Petroleum Geology, 2017, 38(5): 580-585. https://www.cnki.com.cn/Article/CJFDTOTAL-XJSD201705013.htm [12] MANGO F D. An invariance in the isoheptanes of petroleum[J]. Science, 1987, 237(4814): 514-517. [13] MANGO F D. The origin of light hydrocarbons in petroleum: a kinetic test of the steady-state catalytic hypothesis[J]. Geochi-mica et Cosmochimica Acta, 1990, 54(5): 1315-1323. [14] THOMPSON K F M. Classification and thermal history of petroleum based on light hydrocarbons[J]. Geochimica et Cosmochimica Acta, 1983, 47(2): 303-316. [15] 任英姿. 车排子凸起新近系沙湾组原油轻烃地球化学特征及油源分析[J]. 油气地质与采收率, 2014, 21(3): 10-14. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS201403004.htmREN Yingzi. Geochemical characteristic of light hydrocarbon in crude oil, Shawan Formation of Chepaizi Uplift[J]. Petroleum Geology and Recovery Efficiency, 2014, 21(3): 10-14. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS201403004.htm [16] 吴夏, 李生涛, 万慧, 等. 原油轻烃地球化学特征研究[J]. 当代化工, 2018, 47(4): 840-843. https://www.cnki.com.cn/Article/CJFDTOTAL-SYHH201804060.htmWU Xia, LI Shengtao, WAN Hui, et al. Study on geochemical characteristics of light hydrocarbon in crude oil[J]. Contemporary Chemical Industry, 2018, 47(4): 840-843. https://www.cnki.com.cn/Article/CJFDTOTAL-SYHH201804060.htm [17] 王廷栋, 王海清, 李绍基, 等. 以凝析油轻烃和天然气碳同位素特征判断气源[J]. 西南石油学院学报, 1989, 11(3): 1-15. https://www.cnki.com.cn/Article/CJFDTOTAL-XNSY198903000.htmWANG Tingdong, WANG Haiqing, LI Shaoji, et al. Identification of sources of natural gases based on components of C4-C7 light hydrocarbons in oils (condensates) and carbon-isotopic characters of natural gases[J]. Journal of Southwest Petroleum Institute, 1989, 11(3): 1-15. https://www.cnki.com.cn/Article/CJFDTOTAL-XNSY198903000.htm [18] 孔婷, 张敏. C4-C8轻烃在原油地球化学研究中的应用: 以塔里木盆地大宛齐油田凝析油为例[J]. 石油实验地质, 2017, 39(4): 535-543. doi: 10.11781/sysydz201704535KONG Ting, ZHANG Min. Application of C4-C8 light hydrocarbons in geochemical studies: a case of condensates in Dawanqi oil field, Tarim Basin[J]. Petroleum Geology & Experiment, 2017, 39(4): 535-543. doi: 10.11781/sysydz201704535 [19] 杨帆, 冯一璟, 张琪琛. 生物标志化合物在湖泊环境的应用研究[J]. 长江大学学报(自科版), 2015, 12(28): 56-60. https://www.cnki.com.cn/Article/CJFDTOTAL-CJDL201528016.htmYANG Fan, FENG Yijing, ZHANG Qichen. Application of biomarker compound in lake environment[J]. Journal of Yangtze University (Natural Science Edition), 2015, 12(28): 56-60. https://www.cnki.com.cn/Article/CJFDTOTAL-CJDL201528016.htm [20] 罗明霞, 夏永涛, 邵小明, 等. 塔里木盆地顺北油气田不同层系原油地球化学特征对比及成因分析[J]. 石油实验地质, 2019, 41(6): 849-854. doi: 10.11781/sysydz201906849LUO Mingxia, XIA Yongtao, SHAO Xiaoming, et al. Geochemical characteristics and origin of oil from different strata in Shunbei oil and gas field, Tarim Basin[J]. Petroleum Geology and Experiment, 2019, 41(6): 849-854. doi: 10.11781/sysydz201906849 [21] 杨福林, 王铁冠, 李美俊. 塔里木台盆区寒武系烃源岩地球化学特征[J]. 天然气地球科学, 2016, 27(5): 861-872. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201605013.htmYANG Fulin, WANG Tieguan, LI Meijun. Geochemical study of Cambrian source rocks in the cratonic area of Tarim Basin, NW China[J]. Natural Gas Geoscience, 2016, 27(5): 861-872. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201605013.htm [22] 张迈, 刘成林, 田继先, 等. 柴达木盆地西部地区原油地球化学特征及油源对比[J]. 天然气地球科学, 2020, 31(1): 61-72. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX202001006.htmZHANG Mai, LIU Chenglin, TIAN Jixian, et al. Characteristics of crude oil geochemical characteristics and oil source comparison in the western part of Qaidam Basin[J]. Natural Gas Geoscience, 2020, 31(1): 61-72. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX202001006.htm [23] 陈建平, 魏军, 倪云燕, 等. 酒西坳陷原油地球化学特征与成熟度分类[J]. 石油学报, 2018, 39(5): 491-503. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201805001.htmCHEN Jianping, WEI Jun, NI Yunyan, et al. Geochemical features and maturity classification of crude oil in the Jiuxi Depression, Jiuquan Basin[J]. Acta Petrolei Sinica, 2018, 39(5): 491-503. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201805001.htm [24] 曾凡刚, 程克明. 利用双金刚烷指标研究下古生界海相碳酸盐岩的热成熟度[J]. 地质地球化学, 1998, 26(3): 16-20. https://www.cnki.com.cn/Article/CJFDTOTAL-DZDQ199803002.htmZENG Fangang, CHENG Keming. Thermal maturity of Lower Palaeozoic marine carbonate rocks: a double adamantane index study[J]. Geology Geochemistry, 1998, 26(3): 16-20. https://www.cnki.com.cn/Article/CJFDTOTAL-DZDQ199803002.htm [25] STOUT S A, DOUGLAS G S. Diamondoid hydrocarbons: application in the chemical fingerprinting of natural gas condensate and gasoline[J]. Environmental Forensics, 2004, 5(4): 225-235. [26] 任康绪, 黄光辉, 肖中尧, 等. 大宛齐原油金刚烷类化合物及其在油气运移中的应用[J]. 中国石油勘探, 2012, 17(2): 27-31. https://www.cnki.com.cn/Article/CJFDTOTAL-KTSY201202007.htmREN Kangxu, HUANG Guanghui, XIAO Zhongyao, et al. Application of diamondoids to hydrocarbon migration in Dawanqi oilfield, Tarim Basin[J]. China Petroleum Exploration, 2012, 17(2): 27-31. https://www.cnki.com.cn/Article/CJFDTOTAL-KTSY201202007.htm [27] 李二庭, 陈俊, 迪丽达尔·肉孜, 等. 准噶尔盆地腹部地区原油金刚烷化合物特征及应用[J]. 石油实验地质, 2019, 41(4): 569-576. doi: 10.11781/sysydz201904569LI Erting, CHEN Jun, ROUZI Dilidaer, et al. Characteristics of diamondoids in crude oil and its application in hinterland of Junggar Basin[J]. Petroleum Geology and Experiment, 2019, 41(4): 569-576. doi: 10.11781/sysydz201904569 [28] LIANG Qianyong, XIONG Yongqiang, FANG Chenchen, et al. Quantitative analysis of diamondoids in crude oils using Gas Chromatography-Triple Quadrupole Mass Spectrometry[J]. Organic Geochemistry, 2012, 43: 83-91. [29] DES MARAIS D J, DONCHIN J H, NEHRING N L, et al. Molecular carbon isotopic evidence for the origin of geothermal hydrocarbons[J]. Nature, 1981, 292(5826): 826-828. [30] LAUGHREY C D, BALDASSARE F J. Geochemistry and origin of some natural gases in the Plateau Province, central Appalachian Basin Pennsylvania and Ohio[J]. AAPG Bulletin, 1998, 82(2): 317-335. [31] 黄攀, 任江玲, 李二庭, 等. 准噶尔盆地玛湖凹陷烃源岩和原油生物标志物与碳同位素组成及其意义[J]. 地球化学, 2016, 45(3): 303-314. https://www.cnki.com.cn/Article/CJFDTOTAL-DQHX201603006.htmHUANG Pan, REN Jiangling, LI Erting, et al. Biomarker and carbon isotopic compositions of source rock extracts and crude oils from Mahu Sag, Junggar Basin[J]. Geochimica, 2016, 45(3): 303-314. https://www.cnki.com.cn/Article/CJFDTOTAL-DQHX201603006.htm [32] 张文正, 裴戈, 关德师, 等. 中国几个盆地原油轻烃单体和正构烷烃系列分子碳同位素研究[J]. 地质论评, 1993, 39(1): 79-88. https://www.cnki.com.cn/Article/CJFDTOTAL-DZLP199301011.htmZHANG Wenzheng, PEI Ge, GUAN Deshi, et al. The carbon isotopic composition of the light hydrocarbon monomer and normal alkane series molecules form crude oil of some petroliferous basins in China[J]. Geological Review, 1993, 39(1): 79-88. https://www.cnki.com.cn/Article/CJFDTOTAL-DZLP199301011.htm [33] 赵孟军, 黄第藩, 张水昌. 原油单体烃类的碳同位素组成研究[J]. 石油勘探与开发, 1994, 21(3): 52-59. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK403.007.htmZHAO Mengjun, HUANG Difan, ZHANG Shuichang. An on-line carbon isotope study of hydrocarbon monomers in crude oils from Tarim Basin[J]. Petroleum Exploration and Development, 1994, 21(3): 52-59. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK403.007.htm [34] 李二庭, 靳军, 陈俊, 等. 生物降解稠油沥青质热解产物中生物标志化合物与单体烃碳同位素组成研究[J]. 地球化学, 2019, 48(3): 284-292. https://www.cnki.com.cn/Article/CJFDTOTAL-DQHX201903006.htmLI Erting, JIN Jun, CHEN Jun, et al. Study on biomarkers and carbon isotopic compositions of monomer hydrocarbons in asphaltene pyrolysis products from biodegraded heavy oil[J]. Geochimica, 2019, 48(3): 284-292. https://www.cnki.com.cn/Article/CJFDTOTAL-DQHX201903006.htm