Mechanism of “high-speed braking” effect on heavy oil formation during hydrocarbon migration: a case study of the eastern part of southern slope of Dongying Sag, Bohai Bay Basin
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摘要: 油气在运移过程中由于聚集成藏而产生"高速刹车"现象,大分子物质发生阻塞无法通过,而只有小分子物质可以继续运移。王146地区位于渤海湾盆地东营凹陷南坡东段构造鞍部,该地区沙河街组四段储层中的原油地面黏度相比低部位的丁家屋子构造带和高部位的八面河构造带要高。利用"高速刹车"效应来解释这一现象的出现,并分析了该区超稠油油藏的形成机理;同时,从砂体厚度、地层倾角和地层异常压力变化特征3个方面,探讨了"刹车效应"形成的地质条件,并根据研究区3个构造带原油的主峰碳、∑C21-/∑C22+以及降解程度的差异性,为原油"高速刹车"稠化机理的存在找到了有利的地球化学证据。Abstract: The phenomenon of "high-speed braking" occurs due to the accumulation of oil and gas during hydrocarbon migration. Then the macromolecular substances are blocked and cannot pass through, while the small molecules can continue to migrate. The well Wang 146 area is located in the eastern part of the southern slope of the Dongying Sag in the Bohai Bay Basin. The viscosity of crude oil in the fourth member of the Shahejie Formation in this area is higher than that of the Dingjiawuzi structural belt in the lower part and the Bamianhe structural belt in the higher part. The "high-speed braking" effect was used to explain the occurrence of this phenomenon, and the formation mechanism of ultra-heavy oil reservoirs in this area was analyzed. At the same time, the geological conditions for the formation of the "brake effect" were discussed from three aspects: sand body thickness, formation inclination, and the characteristics of abnormal formation pressure. The differences in the main peak carbon, ∑C21-/∑C22+, and the degree of crude oil degradation in the three tectonic belts of the study area can be used as favorable geochemical evidence for the formation of heavy oil caused by the "high-speed braking" effect during crude oil migration.
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图 3 渤海湾盆地东营凹陷南坡东段近EW向油藏剖面剖面位置见图 1A-A′。
Figure 3. Reservoir profile with a nearly EW direction in eastern part of the southern slope of Dongying Sag, Bohai Bay Basin
表 1 渤海湾盆地东营凹陷南坡东段及周缘沙四段原油物性特征统计
Table 1. Physical properties of crude oil in Es4 in east part of southern slope and adjacent area of Dongying Sag, Bohai Bay Basin
地区 次级单元 井名 埋深/m 密度/(g·cm-3) 地面原油黏度/(mPa·s) 凝固点/℃ 含硫量/% 牛庄洼陷 洼陷东缘 王9 3 096.10 0.866 3 10.0 29 0.30 王58 3 019.15 0.870 4 15.6 28 0.49 丁家屋子构造带 王4断层北 王1 2 904.40 0.887 9 29.3 37 0 王5 2 825.10 0.898 0 76.8 35 0.53 王6 2 897.00 0.900 3 58.5 31 0.48 官125断层北 王15 2 559.00 0.943 8 2 600.0 29 2.19 王91 1 403.30 0.927 0 442.0 14 2.23 通32 1 940.50 0.940 7 1 663.0 21 3.18 官125断层南 王斜95 1 563.45 0.944 2 1 829.0 10 3.33 王19 1 985.10 0.995 0 8 954.0 23 3.66 王18 1 665.10 0.946 3 1 841.0 21 2.96 构造鞍部 王143区块 王斜122 2 742.45 0.884 8 37.5 28 0.86 王143 2 798.20 0.938 0 100.0 34 0.64 王146区块 王148 1 748.50 0.976 8 19 902.0 15 4.25 王150 1 462.90 0.985 7 16 512.0 7 3.26 王146 1 735.00 0.967 0 17 307.0 18 3.06 八面河构造带 面4区块 面10 1 561.55 0.952 8 933.0 2.08 面4 1 367.15 0.948 5 534.0 -2.5 1.26 面7 1 446.20 0.956 3 1 843.0 0.96 表 2 渤海湾盆地东营凹陷南坡东段及周缘原油典型地化特征
Table 2. Typical geochemical parameters of oils in Es4 in the eastern part of the southern slope of Dongying Sag, Bohai Bay Basin
地区 井号 层位 Pr/Ph 主峰碳 ΣC21-/ΣC22+ 牛庄洼陷 王58 E2-3s4 0.41 C18 1.00 丁家屋子 王26 E2-3s4 0.13 C24 0.32 丁家屋子东 王斜122 E2-3s4 0.30 C24 0.71 王146地区 王148 E2-3s4 0.18 C24 0.79 王149 E2-3s4 0.22 C24 0.58 八面河地区 面14 1.08 面古3 E1-2k 0.79 C17 1.15 面23-2 E2-3s4 0.28 C17 1.69 面14-8-5 E2-3s4 0.42 C17 0.86 -
[1] 李素梅, 庞雄奇, 邱桂强, 等. 东营凹陷南斜坡王家岗地区第三系原油特征及其意义[J]. 地球化学, 2005, 34(5): 515-524. https://www.cnki.com.cn/Article/CJFDTOTAL-DQHX200505010.htmLI Sumei, PANG Xiongqi, LI Guiqiang, et al. Characteristics and significance of the Tertiary oils in the Wangjiagang oilfield in the South Slope of the Dongying Depression, Bohai Bay Basin[J]. Geochimica, 2005, 34(5): 515-524. https://www.cnki.com.cn/Article/CJFDTOTAL-DQHX200505010.htm [2] 徐伟, 宋国奇, 王建伟. 东营凹陷南坡东段沙四段原油特征及其地质意义[J]. 油气地质与采收率, 2013, 20(2): 30-33. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS201302009.htmXU Wei, SONG Guoqi, WANG Jianwei. Characteristics of Es4 oil and geological significance, east part of South Slope, Dong-ying sag[J]. Petroleum Geology and Recovery Efficiency, 2013, 20(2): 30-33. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS201302009.htm [3] 王圣柱, 金强, 钱克兵, 等. 东营凹陷王家岗地区原油地球化学特征及成因类型[J]. 新疆石油地质, 2006, 27(6): 704-707. https://www.cnki.com.cn/Article/CJFDTOTAL-XJSD200606014.htmWANG Shengzhu, JIN Qiang, QIAN Kebing, et al. Geochemical characteristics and origin classification of crude oil in Wangjiagang area in Dongying Sag[J]. Xinjiang Petroleum Geology, 2006, 27(6): 704-707. https://www.cnki.com.cn/Article/CJFDTOTAL-XJSD200606014.htm [4] 王圣柱, 李茂榕, 钱克兵, 等. 东营凹陷王家岗地区原油成因类型及成藏特征分析[J]. 石油天然气学报, 2007, 29(6): 13-17. https://www.cnki.com.cn/Article/CJFDTOTAL-JHSX200706003.htmWANG Shengzhu, LI Maorong, QIAN Kebing, et al. Genesis types and accumulation characteristics of crude oil in Wangjiagang area, Dongying Sag[J]. Journal of Oil and Gas Technology, 2006, 29(6): 13-17. https://www.cnki.com.cn/Article/CJFDTOTAL-JHSX200706003.htm [5] 王建伟, 宋书君, 李向博, 等. 东营凹陷南斜坡东段原油的地球化学特征[J]. 新疆石油地质, 2007, 28(3): 320-323. https://www.cnki.com.cn/Article/CJFDTOTAL-XJSD200703017.htmWANG Jianwei, SONG Shujun, Li Xiangbo, et al. Geochemical characteristic of crude oil in eastern part of south slope of Dongying Sag[J]. Xinjiang Petroleum Geology, 2007, 28(3): 320-323. https://www.cnki.com.cn/Article/CJFDTOTAL-XJSD200703017.htm [6] 王屿涛, 丁安娜, 惠荣耀. 准噶尔盆地西北缘二叠系稠油地化特征及成因探讨[J]. 石油实验地质, 1997, 19(2): 158-163. doi: 10.11781/sysydz199702158WANG Yutao, DING Anna, HUI Rongyao. Discussion on the geochemical characteristics and geneses of Permian viscous oils at the northwestern edge of Junggar Basin[J]. Petroleum Geo-logy & Experiment, 1997, 19(2): 158-163. doi: 10.11781/sysydz199702158 [7] 朱芳冰, 肖伶俐, 唐小云. 辽河盆地西部凹陷稠油成因类型及其油源分析[J]. 地质科技情报, 2004, 23(4): 55-58. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ200404012.htmZHU Fangbing, XIAO Lingli, TANG Xiaoyun. Heavy oil genetic types and oil-source correlation in western depression, Liaohe Basin[J]. Geological Science and Technology Information, 2004, 23(4): 55-58. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ200404012.htm [8] 胡见义, 徐树宝, 程克明. 中国重质油藏的地质和地球化学成因[J]. 石油学报, 1989, 10(1): 1-11. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB198901000.htmHU Jianyi, XU Shubao, CHENG Keming. Geological and geochemical origin of the heavy oil reservoirs in China[J]. Acta Petrolei Sinica, 1989, 10(1): 1-11. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB198901000.htm [9] 路俊刚, 陈世加, 王绪龙, 等. 严重生物降解稠油成熟度判识: 以准噶尔盆地三台-北三台地区为例[J]. 石油实验地质, 2010, 32(4): 373-376. doi: 10.11781/sysydz201004373LU Jungang, CHEN Shijia, WANG Xulong, et al. Maturity study of the strong biodegradation viscous oil: taking the Santai-Beisantai area of Junggar Basin as an example[J]. Petroleum Geology & Experiment, 2010, 32(4): 373-376. doi: 10.11781/sysydz201004373 [10] 胡守志, 张冬梅, 唐静, 等. 稠油成因研究综述[J]. 地质科技情报, 2009, 28(2): 94-97. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ200902016.htmHU Shouzhi, ZHANG Dongmei, TANG Jing, et al. Review of the genesis of heavy oil[J]. Geological Science and Technology Information, 2009, 28(2): 94-97. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ200902016.htm [11] 庞雄奇, 李素梅, 黎茂稳, 等. 八面河油田油气运聚、成藏模式探讨[J]. 地球科学(中国地质大学学报), 2002, 27(6): 666-670. https://cpfd.cnki.com.cn/Article/CPFDTOTAL-ZGSY200309001008.htmPANG Xiongqi, LI Sumei, LI Maowen, et al. Discussion on petroleum migration in Bamianhe oilfield of Dongying Depression, eastern China[J]. Earth Science (Journal of China University of Geosciences), 2002, 27(6): 666-670. https://cpfd.cnki.com.cn/Article/CPFDTOTAL-ZGSY200309001008.htm [12] 郑亚斌, 黄海平, 周树青, 等. 牛庄洼陷-八面河油田油气运移规律[J]. 油气地质与采收率, 2007, 14(6): 43-46. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS200706014.htmZHENG Yabin, HUANG Haiping, ZHOU Shuqing, et al. Petro-leum migration from Niuzhuang Sag to Bamianhe area[J]. Petroleum Geology and Recovery Efficiency, 2007, 14(6): 43-46. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS200706014.htm [13] 李春梅, 李素梅, 李雪, 等. 山东东营凹陷八面河油田稠油成因分析[J]. 现代地质, 2005, 19(2): 279-286. https://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ20050200H.htmLI Chunmei, LI Sumei, LI Xue, et al. Origin of the heavy oils from the Bamianhe oilfield, Dongying depression[J]. Geoscience, 2005, 19(2): 279-286. https://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ20050200H.htm [14] 王福勇. 东营凹陷南坡异常高压分布与油气运移[J]. 油气地质与采收率, 2008, 15(3): 43-45. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS200803014.htmWANG Fuyong. The surpressure distribution and oil-gas migration in the southern slope of Dongying Depression[J]. Petroleum Geology and Recovery Efficiency, 2008, 15(3): 43-45. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS200803014.htm [15] 刘士林, 郑和荣, 林舸, 等. 渤海湾盆地东营凹陷异常压力分布和演化特征及与油气成藏关系[J]. 石油实验地质, 2010, 32(3): 233-237. doi: 10.11781/sysydz201003233LIU Shilin, ZHENG Herong, LIN Ge, et al. Distribution and evolution characieristics of abnormal pressure and its relationship with hydrocarbon accumulation in the Dongying Sag of Bohai Bay Basin[J]. Experiment Petroleum & Geology, 2010, 32(3): 233-237. doi: 10.11781/sysydz201003233 [16] 李阳, 王建伟, 赵密福, 等. 牛庄洼陷沙河街组超压系统发育特征及其演化[J]. 地质科学, 2008, 43(4): 712-726. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKX200804009.htmLI Yang, WANG Jianwei, ZHAO Mifu, et al. Development characte-ristics of overpressure system of the Shahejie Formation and its evolution in the Niuzhuang Sag, Bohai Bay Basin[J]. Chinese Journal of Geology, 2008, 43(4): 712-726. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKX200804009.htm [17] 张林晔, 李学田. 济阳坳陷滨海地区浅层天然气成因[J]. 石油勘探与开发, 1990(1): 1-7. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK199001000.htmZHANG Linye, LI Xuetian. The origin of nature gas in the shallow reservoir in Binhai area in Jiyang Depression[J]. Petroleum Exploration and Development, 1990(1): 1-7. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK199001000.htm [18] 王万春, 王传远, 刘全友, 等. 依据原油降解级别判识伴生天然气降解程度[J]. 天然气地球科学, 2007, 18(5): 703-708. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX200705015.htmWANG Wanchun, WANG Chuanyuan, LIU Quanyou, et al. Distinguishing oil-associated natural gas biodegradation degree based on petroleum biodegradation grade[J]. Natural Gas Geoscience, 2007, 18(5): 703-708. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX200705015.htm [19] 王兴谋, 张云银, 张明振, 等. 关于济阳坳陷浅层气藏与稠油油藏联合勘探的思考[J]. 油气地质与采收率, 2014, 21(5): 14-17. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS201405004.htmWANG Xingmou, ZHANG Yunyin, ZHANG Mingzhen, et al. An approach of exploring shallow gas and heavy oil in Jiyang Depression based on their paragenetic relationship[J]. Petroleum Geology and Recovery Efficiency, 2014, 21(5): 14-17. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS201405004.htm -