Evaluating Fault Sealing Using Geochemical Techniques
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摘要: 断层的封闭性和连通性研究对于了解断层在油气成藏和石油开发中的影响具有重要的意义.根据断层附近油藏的地球化学特征, 可以研究排烃期断层的封闭性.在涠西南凹陷油田的研究工作中, 通过断层两端油层的化学组成指纹的差异, 证实了断层的存在, 虽然断距较小, 但仍影响了油藏的连通.对欧利坨子地区靠近断层的油藏分析表明, 本区的深大断裂可以作为油气的有效通道, 靠近断层油藏成熟度较高, 且含氮化合物较丰富.本研究提供的2个实例证实地球化学方法用于判断断层的封闭性有着不可替代的优越性.Abstract: The fault sealing and reservoir continuity of different fault blocks is a very important issue for the study of oil filling histories and production. This study primarily considers the geochemical characteristics of petroleum reservoirs near faults, which can provide information about fault sealing in the geological record and hydrocarbons expulsion stage. Two research areas were chosen for the study of fault sealing in petroleum migration and reservoir continuity. One is in Weixinan sag, Beibuwan basin and the other is in Oulituozi region, Liaohe depression, Bohai Gulf basin. In the first locality, by analyzing geochemical chromatographic fingerprints, we found that a fault existed and was a major factor in poor reservoir continuity, although it is a small fault. The Oulituozi region geochemical and geological analysis shows that the oil pool near the fault has relatively high maturity and is abundant in pyrrolic nitrogen compounds. These results prove that the fault played an important role in petroleum migration. The two sites studied illustrate the advantages of geochemical techniques over other methods, in the study of fault sealing.
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Key words:
- fault sealing /
- geochemical technique /
- reservoir geochemistry
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图 2 根据断层两盘油水界面判断断层的封闭性
Fig. 2. Fault sealing deduced by different oil-water interfaces
图 5 用于油层连通性识别的10对色谱指纹峰
Fig. 5. Ten GC peak ratios which are used to determine reservoir continuity
图 6 WZ5井和WZ6井Ⅳ油组(a)和Ⅴ油组(b) 原油色谱指纹星状图
Fig. 6. Radar or star plot of selected peak ratios from gas chromatographic analysis of oils in the formation group Ⅳ (a) and Ⅴ (b) of well WZ5 and WZ6
图 7 根据成熟度判定断层在油气运移中的作用
Fig. 7. Diagram showing the action of the fault on petroleum migration by maturity parameters
图 8 欧利坨子地区原油含氮化合物绝对浓度与甾烷成熟度参数的关系
Fig. 8. Diagram showing the relationship between concentration of pyrrolic nitrogen compounds in the oils of Oulituozi region and maturity parameters of C29 sterances
表 1 涠12-1油田W2Ⅴ和W2Ⅳ油组△Px参数结果
Table 1. Gas chromatographic parameters of the formation groups W2Ⅴ and W2Ⅳ in Weizhou 12-1 oilfield
表 2 利坨子地区原油含氮化合物参数值
Table 2. Parameters for pyrrolic nitrogen compounds in the oils of Oulituozi region
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[1] Hou, D. J., Tang, Y. J., Li, X. Q., et al., 2002. The identification and quantitative analysis of mixing oil in Oulituozi region. In: Zhang, D. J., ed., Symposium on the 4th national petroleum geology experiment technology and administration. Petroleum Industry Press, Beijing, 74-82(in Chinese). [2] Hwang, R. J., Ahmed, A. S., Moldowan, J. M., 1994. Oil composition variation and reservoir continuity: Unity field, Sudan. Organic Geochemistry, 21: 171-188. doi: 10.1016/0146-6380(94)90153-8 [3] Kaufman, R. L., Ahmed, A. S., Elsinger, R. L., 1990. Gas chromatography as a development and production tool for fingerprinting oils from individual reservoirs: Application in the Gulf of Mexico. Gulf Coast Section of the Society of Economic Paleontologists and Mineralogists Foundation Ninth Annual Research Conference Proceedings, 263-282. [4] Kaufman, R. L., Ahmed, A. S., Hempkins, W. B., 1987. A new technique for the analysis of com-mingled oils and its application to production allocation calculations. Proceedings of the sixteenth annual convention of the Indonesian Petroleum Association. Indonesian Petroleum Association, Jakarta, 247-268. [5] Wang, Z. X., Xin, Q. L., 1997. The discussion on underground fault sealing. Geological Journal of China Universities, 3 (3): 293-300(in Chinese with English abstract). [6] 侯读杰, 唐友军, 李贤庆, 等, 2002. 欧利坨子地区混源油的识别及定量研究. 见: 张大江. 第四届全国石油地质实验技术及实验室管理工作交流会议论文集. 北京: 石油工业出版社, 74-82. [7] 王志欣, 信荃麟, 1997. 关于地下断层封闭性的讨论. 高校地质学报, 3(3): 293-300. https://www.cnki.com.cn/Article/CJFDTOTAL-GXDX703.005.htm -
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