Oil Migration Model and Entrapment Epoch of North Wuerxun Depression in Hailaer Basin
-
摘要: 海拉尔盆地由多个凹陷构成, 油气潜在资源丰富.研究含油凹陷油气的来源、油气充注方向及成藏时间对指导盆地油气勘探具有理论和现实意义.以乌尔逊凹陷为例, 采用生物标志化合物及含氮化合物定量分析技术, 研究了石油的来源及运移方向; 利用自生伊利石K-Ar同位素测年法、源岩生排烃史法及储层流体包裹体测温法, 探讨了石油成藏期.结果表明, 原油主要来源于凹陷南部“烃源灶”内的南屯组生油岩, 油气成藏中发生了侧向运移.通源大断裂是油气运移的主要通道, 断层两盘的构造圈闭是油气聚集成藏的有利部位.苏仁诺尔构造带石油沿断裂向北东方向运移, 最大距离可达20 km.乌尔逊凹陷有3次成藏期, 其中距今100 Ma左右的伊敏组沉积末期是该区的主要成藏期.凹陷中随油藏与“烃源灶”距离的减小, 成藏期呈现逐渐变晚的趋势.Abstract: Based on the organic geochemical analysis of oils and source rock in Wuerxun depression, Hailaer basin, hydrocarbons are thought to be derived from the Nantun Formation in south Wuerxun depression and to enter the oil pools through lateral migration. Apparent migration pathways along the Surennuoer fault belt can be traced by means of absolute abundance of pyrrolic nitrogen compounds and biomarkers from the oil samples. The results indicate that the large fault is the dominant pathway in which the oil can migrates for a long distance, and fill easily into the traps near the fault. According to the migration effects of pyrrolic nitrogen compounds in the oils, the maximum migratation distance is estimated to be about 20 km. The analysis of K-Ar illite age, fluid inclusion and history of source rock expulsion indicates that there are three oil filling and entrapment events, the major oil entrapment epoch occurrs in the Late Yimin period about 100 Ma before the present. It can be also observed that the farther the pools away from the source kitchen are, the earlier the ages of oil filling are.
-
Key words:
- Hailaer basin /
- Wuerxun depression /
- oil migration /
- entrapment epoch
-
图 1 海拉尔盆地乌北地区烃源灶及油藏分布
Fig. 1. Distribution of source kitchen and oil pools in north Wuerxun depression, Hailaer basin
图 3 海拉尔盆地乌北地区原油含氮化合物指标变化
Fig. 3. Laterial migartion effects of the oils in north Wuerxun depression
图 4 海拉尔盆地乌北地区乌3井源岩生排烃史
Fig. 4. Hydrocarbon generation and expulsion history of source rock in well Wu 3
图 5 乌北地区储层包裹体均一化温度分布与沉积史、热史
Fig. 5. Histogram of homogenisation temperatures for fluid inclusion and burial history and thermal history of north Wuerxun depression
表 1 海拉尔盆地乌尔逊北部原油生物标志化合物参数
Table 1. Biomarker parameters of oils in north Wuerxun depression
表 2 自生伊利石K-Ar法同位素测年数据
Table 2. Data of authigenic illite K-Ar isotope
-
Bai, G.P., 2000. Application of K-Ar dating technique to determination of timing of oil/gas entrapment. Journal of the University of Petroleum, 24(4): 100-103(in Chinese with English abstract). Gao, G., Huang, Z.L., 2002. Research on organic inclusion in reservoir and gas accumulation process in Pingluoba gas field. Acta Sedimentologica Sinica, 20(1): 156-159(in Chinese with English abstract). Li, M., Larter, S.R., Stoddart, D., et al., 1995. Fractionation of pyrrolic nitrogen compounds in petroleum during migra-tion: Derivation of migration related geochemical parame-ters. In: Cubitt, J.M., England, W.A., eds., The Geochemistry of Reservoirs. Geological Society Special Publication, (86): 103-123. Li, S.M., Pang, X.Q., Jin, Z.J., 2002. Distribution and signif-icance of steroids in Bamianhe oilfield, east China. Earth Science-Journal of China University of Geosciences, 27 (6): 711-717. Li, S.M., Wang, T.G., 1999. Geochemical characteristics and significance of the pyrrolic compounds in petroleum. Acta Sedimentologica Sinica, 17(2): 312-317(in Chinese with English abstract). Liu, L.F., 1997. Investigation on pyrolytic nitrogen compounds in the Qun-4 well oil of the Tarim basin. Acta Sedimentologica Sinica, 15(2): 184-187(in Chinese with English abstract). Liu, L.F., Kang, Y.S., 1998. Investigation on secondary mi-gration of oils in central Tarim, Tarim basin using pyrrolic nitrogen compounds. Geochimica, 27(5): 475-482(in Chinese with English abstract). Liu, L.F., Xu, X.D., 1996. Study of nitrogen compounds and petroleum migration. Petroleum Explorationist, 1(2): 33-37(in Chinese with English abstract). Pang, X.Q., 1995. Theory of hydrocarbon expulsion threshold' s controlling hydrocarbon and its application. Petroleum Industry Press, Beijing, 31-56(in Chinese). Pang, X.Q., Li, S.M., Li, M.W., et al., 2002. Discussion on petroleum migration in Bamianhe oilfield of Dongying depression, eastern China. Earth Science-Journal of China University of Geosciences, 27(6): 666-670(in Chinese with English abstract). Yamamoto, M., 1992. Fractionation of azaarenes during oil migration. Org. Geochem., 19(4-6): 389-402. doi: 10.1016/0146-6380(92)90007-K Zhang, H.F., Jin, Z.J., 2000. Present situation and the future of petroleum migration research in our country. Journal of the University of Petroleum, 24(4): 1-3(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-SYDX200004000.htm 白国平, 2000. 伊利石K-Ar测年在确定油气成藏期中的应用. 石油大学学报, 24(4): 100-103. doi: 10.3321/j.issn:1000-5870.2000.04.025 高岗, 黄志龙, 2003. 平落坝储层有机包裹体特征与气藏形成过程研究. 沉积学报, 20(1): 156-159. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB200201025.htm 李素梅, 王铁冠, 1999. 原油中的吡咯类化合物的地球化学特征及其意义. 沉积学报, 17(2): 312-317. doi: 10.3969/j.issn.1000-0550.1999.02.025 李素梅, 庞雄奇, 金之钧, 2002. 八面河地区原油、烃源岩中甾类化合物的分布特征及其应用. 地球科学——中国地质大学学报, 27(6): 711-717. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200206009.htm 刘洛夫, 1997. 塔里木盆地群4井原油吡咯类化合物地球化学研究. 沉积学报, 15(2): 184-187. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB702.038.htm 刘洛夫, 康永尚, 1998. 运用原油中吡咯类含氮化合物研究塔里木盆地塔中地区石油的二次运移. 地球化学, 27(5): 475-482. doi: 10.3321/j.issn:0379-1726.1998.05.009 刘洛夫, 徐新德, 1996. 含氮化合物与石油运移研究. 勘探家, 1(2): 33-37. https://www.cnki.com.cn/Article/CJFDTOTAL-KTSY199602008.htm 庞雄奇, 1995. 排烃门限控油气理论与应用. 北京: 石油工业出版社, 31-56. 庞雄奇, 李素梅, 黎茂稳, 等, 2002. 八面河油田油气运聚、成藏模式探讨. 地球科学——中国地质大学学报, 27(6): 666-670. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200206002.htm 张厚福, 金之钧, 2000. 我国油气运移的研究现状与展望. 石油大学学报(自然科学版), 24(4): 1-3. https://www.cnki.com.cn/Article/CJFDTOTAL-SYDX200004000.htm -
下载:
点击查看大图
计量
- 文章访问数: 3573
- HTML全文浏览量: 909
- PDF下载量: 10
- 被引次数: 0
