Shale Oil Reservoir Structure Characteristics of the Second Member of Kongdian Formation in Cangdong Sag, Bohai Bay Basin
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摘要: 为进一步明确湖相页岩层系优势储集岩性，聚焦页岩油甜点、提高水平段甜点钻遇率，增加水平井页岩油产量，利用沧东凹陷孔二段G108-8井494.29 m岩心，3 000余块次薄片、扫描电镜、核磁共振、压汞和全岩X衍射等数据，系统分析页岩层系中碳酸盐岩、砂岩和泥页岩孔隙类型、结构及非均质特征.结果表明：长石、石英和有机质对储集空间发育具有建设性作用，方解石、黏土和方沸石矿物是储集空间发育的不利因素，白云岩化作用虽在一定程度上改善了碳酸盐储层结构，但白云岩类微晶、泥晶纳米级晶间孔隙储集、渗流条件较差，页岩层系优势储集岩性主要包括砂岩、纹层型页岩和裂缝型白云岩3种类型；纹层型页岩储层基质储集、渗流相对较好，富长英质矿物纹层内残余粒间孔、溶蚀孔之间连通性较好，压裂改造后人工裂缝与基质孔缝形成复杂缝网结构，具备稳产能力，是页岩油主力产层.根据新认识，将钻探箱体聚焦到8~10 m厚纹层状长英质页岩段，GY5-3-1L、GY5-1-9H两口井首年单井累产油超1.0×104 t，桶油成本下降到65美元，实现了湖相页岩油效益开发.Abstract: In order to further clarify the dominant reservoir lithology of lacustrine shale strata, focus on sweet spots, improve the drilling encounter rate of sweet spots in the horizontal section, and increase the shale oil production of horizontal wells, this paper comprehensively uses the 494.29 m core of Well G108-8 in the second member of Kongdong Sag, more than 3 000 sub-sections, scanning electron microscopy, nuclear magnetic resonance, mercury intrusion and whole-rock X-ray analysis data to systematically analyze the carbonate rock, sandstone and shale pore types, structures, and heterogeneity. The results show that feldspar, quartz and organic matter have a constructive role in the development of reservoirs. Calcite, clay and analcite minerals are unfavorable factors for the development of reservoir space. Although dolomitization has improved carbon to a certain extent, dolomite-like microcrystalline, micrite nano-scale intercrystalline pore storage and poor seepage conditions, the dominant reservoir lithology of shale oil mainly includes feldspar lithic sandstone, laminar type shale and fractured dolomite. Laminar shale has various types of reservoir space, and the residual intergranular pores and dissolution pores in the laminae rich in felsic minerals have good connectivity. Artificial fractures form complex fracture network structure with the matrix pores and fractures, and has the ability to stabilize production, which is the main production layer of shale oil in the second member of the hole. The newly implemented horizontal well focuses the drilling box to the 8-10 m thick layered felsic shale interval, wells GY5-3-1L and GY5-1-9H produced more than 1.0×104 t of oil per well in the first year, and the cost per barrel of oil dropped to US ＄65, realizing the profitable development of lacustrine shale oil.
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Key words:
- Bohai Bay Basin /
- Cangdong Sag /
- second member of Kongdian Formation /
- shale oil /
- reservoir /
- pore structure /
- petroleum geology
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图 1 黄骅坳陷构造简图（a）, 沧东凹陷孔二段沉积体系图（b）及地层综合柱状图（c）
Fig. 1. Structural diagram of Huanghua Depression (a), sedimentary system diagram (b) and comprehensive stratigraphic histogram (c) of the second member of Kongdian Formation in Cangdong Sag
图 2 沧东凹陷孔二段典型岩性及组合特征(G108-8井)
Fig. 2. Typical lithology and assemblage characteristics of the second member of Kongdian Formation in Cangdong Sag (Well G108-8)
图 3 沧东凹陷孔二段页岩层系基质孔隙类型（G108-8井）
Fig. 3. Matrix pore types of shale formations of the second member of Kongdian Formation in Cangdong Sag (Well G108-8)
图 4 沧东凹陷孔二段页岩层系不同尺度下裂缝发育特征（G108-8井）
Fig. 4. Fracture characteristics of shale strata at different scales of the second member of Kongdian Formation in Cangdong Depression (Well G108-8)
图 5 沧东凹陷孔二段页白云岩基质孔隙特征（G108-8井）
Fig. 5. Dolomite matrix pore characteristics of the second member of Kongdian Formation in Cangdong Sag (Well G108-8)
图 6 沧东凹陷孔二段砂岩C-M图（G108-8井）
Fig. 6. Sandstone C-M map of the second member of Kongdian Formation in Cangdong Sag (Well G108-8)
图 7 沧东凹陷孔二段典型岩性核磁共振T2谱分布图（G108-8井）
Fig. 7. Typical lithology NMR T2 spectrum distribution of the second member of Kongdian Formation in Cangdong Sag (Well G108-8)
图 8 沧东凹陷孔二段典型砂岩储层结构特征（G108-8井）
Fig. 8. Typical sandstone reservoir structural characteristics of the second member of Kongdian Formation in Cangdong Sag (Well G108-8)
图 9 沧东凹陷孔二段泥页岩孔隙度与渗透率影响因素（G108-8井，326个样品点）
Fig. 9. Influencing factors of shale porosity and permeability of the second member of Kongdian Formation in Cangdong Sag (Well G108-8, 326 samples)
表 1 沧东凹陷孔二段页岩油储层类型及特征
Table 1. Reservoir types and characteristics of the second member of Kongdian Formation in Cangdong Sag
岩性 主要储集空间类型 储层物性特征 储层结构特征 综合评价 大类 细分岩性 孔隙度 渗透率
（mD）排驱压力
（MPa）最大汞饱和度 退汞效率 （泥）
页岩纹层型页岩 （大、中、小、微）孔 3%~7% 0.1~10 0.1~1 40%~60% 60%~80% 储层√ 块状泥岩 （小、微）孔 < 3% < 0.1 > 10 0~20% 0~40% 差储层 碳酸盐岩 裂缝型白云岩 裂缝、（大、中）孔 孔缝发育、渗透性好 - - - 储层√ 白云岩 （大、中）孔 2%~5% < 0.1 0.1~1 40%~80% 0~20% 差储层 泥质白云岩 （中、小）孔 < 3% 0.1~1 1~10 0~40% 0~100% 差储层 砂岩 长石岩屑砂岩 （大、中）孔 8%~12% 1~10 1~10 80%~100% 30%~50% 储层√ 方解石胶结长石岩屑砂岩 （中、小）孔 5%~8% 0.1~1 60%~100% 差储层 砂岩 长石岩屑砂岩 （大、中）孔 8%~12% 1~10 1~10 80%~100% 30%~50% 储层√ 
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[1] Bai, S. T., Cheng, D. J., Wan, J. B., et al., 2016. Quantitative Characterization of Sandstone NMR T2 Spectrum. Acta Petrolei Sinica, 37(3): 382-391, 414 (in Chinese with English abstract). doi: 10.1038/aps.2015.120 [2] Chen, C. W., Xue, L. F., Xu, X. K., et al., 2007. Re-Establishment of Basin Framework on Member 2 of Kongdian Formation in Kongnan Area, Huanghua Depression. Acta Sedimentologica Sinica, 25(4): 511-517 (in Chinese with English abstract). doi: 10.3969/j.issn.1000-0550.2007.04.004 [3] Fu, S. T., Jin, Z. J., Fu, J. H., et al., 2021. Transformation of Understanding from Tight Oil to Shale Oil in the Member 7 of Yanchang Formation in Ordos Basin and Its Significance of Exploration and Development. Acta Petrolei Sinica, 42(5): 561-569 (in Chinese with English abstract). [4] Gao, S. S., Hu, Z. M., Liu, H. X., et al., 2016. Microscopic Pore Characteristics of Different Lithological Reservoirs. Acta Petrolei Sinica, 37(2): 248-256 (in Chinese with English abstract). [5] Han, G. M., Wang, L., Xiao, D. Q., et al., 2021. Magmatic Hydrothermal Fluid Genesis of Zeolite in the Paleogene Kongdian Formation of Zaoyuan Oilfield, Bohai Bay Basin, China. Petroleum Exploration and Development, 48(5): 950-961 (in Chinese with English abstract). [6] Huang, L., Shen, W., 2015. Characteristics and Controlling Factors of the Formation of Pores of a Shale Gas Reservoir: A Case Study from Longmaxi Formation of the Upper Yangtze Region, China. Earth Science Frontiers, 22(1): 374-385 (in Chinese with English abstract). [7] Lei, W. Z., Chen, D. X., Zhang, R., et al., 2021. Lithological Combination Types and Characteristics of Continental Shale Strata in the Second Sub-Member of Da'anzhai in Central Sichuan. Earth Science, 46(10): 3657-3672 (in Chinese with English abstract). [8] Li, M. G., Qi, J. F., Yang, Q., et al., 2009. Cenozoic Structure Features of Huanghua Depression and Its Structure Dynamics Model. Acta Geoscientica Sinica, 30(2): 201-209 (in Chinese with English abstract). [9] Li, S. Z., Suo, Y. H., Zhou, L. H., et al., 2011. Pull-Apart Basins within the North China Craton: Structural Pattern and Evolution of Huanghua Depression in Bohai Bay Basin. Journal of Jilin University (Earth Science Edition), 41(5): 1362-1379 (in Chinese with English abstract). [10] Liu, Z. G., Zhang, Y. S., Song, G. Y., et al., 2021. Mixed Carbonate Rocks Lithofacies Features and Reservoirs Controlling Mechanisms in the Saline Lacustrine Basin in Yingxi Area, Qaidam Basin, NW China. Petroleum Exploration and Development, 48(1): 68-80 (in Chinese with English abstract). [11] Liu, Z. G., Zhu, C., Li, S. M., et al., 2017. Geological Features and Exploration Fields of Tight Oil in the Cenozoic of Western Qaidam Basin, NW China. Petroleum Exploration and Development, 44(2): 196-204 (in Chinese with English abstract). [12] Moore, C. H., Wade, W. J., 2013. Carbonate Reservoirs: Porosity Evolution and Diagenesis in a Sequence Straigraphic Framework. Elsevier, Amsterdam. [13] Ren, J. Y., Liao, Q. J., Lu, G. C., et al., 2010. Deformation Framework and Evolution of the Huanghua Depression, Bohai Gulf. Geotechonica et Metallogenia, 34(4): 461-472 (in Chinese with English abstract). [14] Yang, F., Pu, X. G., Jiang, W. Y., et al., 2018. Organic Geochemistry Characteristics of the Fine Grained Sedimentary Rock of the Second Member of Kongdian Formation (Ek2) in Cangdong Sag, Huanghua Depression, Bohai Bay Basin. Natural Gas Geoscience, 29(4): 550-558 (in Chinese with English abstract). [15] Zhang, J. F., Xu, X. Y., Bai, J., et al., 2020. Enrichment and Exploration of Deep Lacustrine Shale Oil in the First Member of Cretaceous Qingshankou Formation, Southern Songliao Basin, NE China. Petroleum Exploration and Development, 47(4): 637-652 (in Chinese with English abstract). [16] Zhang, L. L., Lu, Z. Y., Wang, J., et al., 2016. Microscopic Pore Structure of Shale Oil Reservoirs in the Lower 3rd Member of Shahejie Formation in Zhanhua Sag, Bohai Bay Basin. Oil & Gas Geology, 37(1): 80-86 (in Chinese with English abstract). [17] Zhang, P. P., Liu, X. P., Guan, M., et al., 2021. Study on Characteristics and Main Controlling Factors of Nano-Pores in Low-Maturity Shale Reservoirs in Member 2 of Kongdian Formation in Cangdong Sag. Special Oil & Gas Reservoirs, 28(2): 20-26 (in Chinese with English abstract). doi: 10.3969/j.issn.1006-6535.2021.02.003 [18] Zhang, Y., Chen, S. Y., Meng, Q. A., et al., 2015. The Discovery of Analcite in Fine-Grained Sedimentary Rocks of the Second Member of Kongdian Formation in Cangdong Sag, Huanghua Depression: Implications for Early Digenetic Environment. China Petroleum Exploration, 20(4): 37-43 (in Chinese with English abstract). doi: 10.3969/j.issn.1672-7703.2015.04.004 [19] Zhao, W. Z., Zhu, R. K., Hu, S. Y., et al., 2020. Accumulation Contribution Differences between Lacustrine Organic-Rich Shales and Mudstones and Their Significance in Shale Oil Evaluation. Petroleum Exploration and Development, 47(6): 1079-1089 (in Chinese with English abstract). [20] Zhao, X. Z., Pu, X. G., Han, W. Z., et al., 2017. A New Method for Lithology Identification of Fine Grained Deposits and Reservoir Sweet Spot Analysis: A Case Study of Kong 2 Member in Cangdong Sag, Bohai Bay Basin, China. Petroleum Exploration and Development, 44(4): 492-502 (in Chinese with English abstract). [21] Zhao, X. Z., Pu, X. G., Zhou, L. H., et al., 2021. Enrichment Theory, Exploration Technology and Prospects of Shale Oil in Lacustrine Facies Zone of Deep Basin: A Case Study of the Paleogene in Huanghua Depression, Bohai Bay Basin. Acta Petrolei Sinica, 42(2): 143-162 (in Chinese with English abstract). [22] Zhao, X. Z., Zhou, L. H., Pu, X. G., et al., 2018. Geological Characteristics of Shale Rock System and Shale Oil Exploration in a Lacustrine Basin: A Case Study from the Paleogene 1st Sub-Member of Kong 2 Member in Cangdong Sag, Bohai Bay Basin, China. Petroleum Exploration and Development, 45(3): 361-372 (in Chinese with English abstract). [23] Zhao, X. Z., Zhou, L. H., Pu, X. G., et al., 2019. Favorable Formation Conditions and Enrichment Characteristics of Lacustrine Facies Shale Oil in Faulted Lake Basin: A Case Study of Member 2 of Kongdian Formation in Cangdong Sag, Bohai Bay Basin. Acta Petrolei Sinica, 40(9): 1013-1029 (in Chinese with English abstract). [24] Zhi, D. M., Tang, Y., Yang, Z. F., et al., 2019. Geological Characteristics and Accumulation Mechanism of Continental Shale Oil in Jimusaer Sag, Junggar Basin. Oil & Gas Geology, 40(3): 524-534 (in Chinese with English abstract). [25] Zhou, L. H., Chen, C. W., Han, G. M., et al., 2021. Difference Characteristics between Continental Shale Oil and Tight Oil and Exploration Practice: A Case from Huanghua Depression, Bohai Bay Basin. Earth Science, 46(2): 555-571 (in Chinese with English abstract). [26] Zhou, L. H., Chen, C. W., Yang, F., et al., 2020. Micropore Structure Characteristics and Quantitative Characterization Methods of Lacustrine Shale—A Case Study from the Member 2 of Kongdian Formation, Cangdong Sag, Bohai Bay Basin. Petroleum Research, 5(2): 93-102. https://doi.org/10.1016/j.ptlrs.2020.01.001 [27] Zhou, L. H., Pu, X. G., Chen, C. W., et al., 2018. Concept, Characteristics and Prospecting Significance of Fine-Grained Sedimentary Oil Gas in Terrestrial Lake Basin: A Case from the Second Member of Paleogene Kongdian Formation of Cangdong Sag, Bohai Bay Basin. Earth Science, 43(10): 3625-3639 (in Chinese with English abstract). [28] Zhou, L. H., Zhao, X. Z., Chai, G. Q., et al., 2020. Key Exploration & Development Technologies and Engineering Practice of Continental Shale Oil: A Case Study of Member 2 of Paleogene Kongdian Formation in Cangdong Sag, Bohai Bay Basin, East China. Petroleum Exploration and Development, 47(5): 1059-1066 (in Chinese with English abstract). [29] 白松涛, 程道解, 万金彬, 等, 2016. 砂岩岩石核磁共振T2谱定量表征. 石油学报, 37(3): 382-391, 414. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201603011.htm [30] 陈长伟, 薛林福, 徐兴科, 等, 2007. 黄骅坳陷孔南地区孔二段湖盆结构恢复. 沉积学报, 25(4): 511-517. doi: 10.3969/j.issn.1000-0550.2007.04.004 [31] 付锁堂, 金之钧, 付金华, 等, 2021. 鄂尔多斯盆地延长组7段从致密油到页岩油认识的转变及勘探开发意义. 石油学报, 42(5): 561-569. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB202105001.htm [32] 高树生, 胡志明, 刘华勋, 等, 2016. 不同岩性储层的微观孔隙特征. 石油学报, 37(2): 248-256. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201602012.htm [33] 韩国猛, 王丽, 肖敦清, 等, 2021. 渤海湾盆地枣园油田古近系孔店组沸石矿物的岩浆热液成因. 石油勘探与开发, 48(5): 950-961. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK202105008.htm [34] 黄磊, 申维, 2015. 页岩气储层孔隙发育特征及主控因素分析: 以上扬子地区龙马溪组为例. 地学前缘, 22(1): 374-385. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201501035.htm [35] 雷文智, 陈冬霞, 张芮, 等, 2021. 川中地区下侏罗统自流井组大二亚段陆相页岩层系岩性组合类型及其特征. 地球科学, 46(10): 3657-3672. doi: 10.3799/dqkx.2021.023 [36] 李明刚, 漆家福, 杨桥, 等, 2009. 渤海湾盆地黄骅坳陷新生代结构特征及构造动力学模式. 地球学报, 30(2): 201-209. https://www.cnki.com.cn/Article/CJFDTOTAL-DQXB200902009.htm [37] 李三忠, 索艳慧, 周立宏, 等, 2011. 华北克拉通内部的拉分盆地: 渤海湾盆地黄骅坳陷结构构造与演化. 吉林大学学报(地球科学版), 41(5): 1362-1379. https://www.cnki.com.cn/Article/CJFDTOTAL-CCDZ201105011.htm [38] 刘占国, 张永庶, 宋光永, 等, 2021. 柴达木盆地英西地区咸化湖盆混积碳酸盐岩岩相特征与控储机制. 石油勘探与开发, 48(1): 68-80. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK202101008.htm [39] 刘占国, 朱超, 李森明, 等, 2017. 柴达木盆地西部地区致密油地质特征及勘探领域. 石油勘探与开发, 44(2): 196-204. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201702004.htm [40] 任建业, 廖前进, 卢刚臣, 等, 2010. 黄骅坳陷构造变形格局与演化过程分析. 大地构造与成矿学, 34(4): 461-472. https://www.cnki.com.cn/Article/CJFDTOTAL-DGYK201004005.htm [41] 杨飞, 蒲秀刚, 姜文亚, 等, 2018. 渤海湾盆地沧东凹陷孔二段细粒相区有机地球化学特征. 天然气地球科学, 29(4): 550-558. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201804012.htm [42] 张君峰, 徐兴友, 白静, 等, 2020. 松辽盆地南部白垩系青一段深湖相页岩油富集模式及勘探实践. 石油勘探与开发, 47(4): 637-652. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK202004002.htm [43] 张磊磊, 陆正元, 王军, 等, 2016. 渤海湾盆地沾化凹陷沙三下亚段页岩油层段微观孔隙结构. 石油与天然气地质, 37(1): 80-86. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT201601012.htm [44] 张盼盼, 刘小平, 关铭, 等, 2021. 沧东凹陷孔二段低熟页岩纳米孔隙特征及主控因素. 特种油气藏, 28(2): 20-26. https://www.cnki.com.cn/Article/CJFDTOTAL-TZCZ202102003.htm [45] 张跃, 陈世悦, 孟庆爱, 等, 2015. 黄骅坳陷沧东凹陷孔二段细粒沉积岩中方沸石的发现及其地质意义. 中国石油勘探, 20(4): 37-43. https://www.cnki.com.cn/Article/CJFDTOTAL-KTSY201504005.htm [46] 赵文智, 朱如凯, 胡素云, 等, 2020. 陆相富有机质页岩与泥岩的成藏差异及其在页岩油评价中的意义. 石油勘探与开发, 47(6): 1079-1089. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK202006003.htm [47] 赵贤正, 蒲秀刚, 韩文中, 等, 2017. 细粒沉积岩性识别新方法与储集层甜点分析——以渤海湾盆地沧东凹陷孔店组二段为例. 石油勘探与开发, 44(4): 492-502. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201704003.htm [48] 赵贤正, 蒲秀刚, 周立宏, 等, 2021. 深盆湖相区页岩油富集理论、勘探技术及前景——以渤海湾盆地黄骅坳陷古近系为例. 石油学报, 42(2): 143-162. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB202102001.htm [49] 赵贤正, 周立宏, 蒲秀刚, 等, 2018. 陆相湖盆页岩层系基本地质特征与页岩油勘探突破——以渤海湾盆地沧东凹陷古近系孔店组二段一亚段为例. 石油勘探与开发, 45(3): 361-372. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201803002.htm [50] 赵贤正, 周立宏, 蒲秀刚, 等, 2019. 断陷湖盆湖相页岩油形成有利条件及富集特征——以渤海湾盆地沧东凹陷孔店组二段为例. 石油学报, 40(9): 1013-1029. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201909001.htm [51] 支东明, 唐勇, 杨智峰, 等, 2019. 准噶尔盆地吉木萨尔凹陷陆相页岩油地质特征与聚集机理. 石油与天然气地质, 40(3): 524-534. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT201903009.htm [52] 周立宏, 陈长伟, 韩国猛, 等, 2021. 陆相致密油与页岩油藏特征差异性及勘探实践意义: 以渤海湾盆地黄骅坳陷为例. 地球科学, 46(2): 555-571. doi: 10.3799/dqkx.2020.081 [53] 周立宏, 蒲秀刚, 陈长伟, 等, 2018. 陆相湖盆细粒岩油气的概念、特征及勘探意义: 以渤海湾盆地沧东凹陷孔二段为例. 地球科学, 43(10): 3625-3639. doi: 10.3799/dqkx.2018.990 [54] 周立宏, 赵贤正, 柴公权, 等, 2020. 陆相页岩油效益勘探开发关键技术与工程实践——以渤海湾盆地沧东凹陷古近系孔二段为例. 石油勘探与开发, 47(5): 1059-1066. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK202005023.htm -
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