Maturity limit of sweet spot area for continental matrix type shale oil: a case study of lower Es3 and upper Es4 sub-members in Dongying Sag, Bohai Bay Basin
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摘要: 陆相基质型页岩油有望成为我国页岩油增储上产的主力页岩油类型。鉴于成熟度是控制基质型页岩油甜点区分布的重要因素，在分析我国典型陆相不同有机质类型富有机质泥页岩实测镜质体反射率Ro值抑制程度基础上，以渤海湾盆地东营凹陷沙三下-沙四上亚段为例，探讨了陆相基质型页岩油甜点区成熟度界限。陆相富有机质泥页岩的有机质类型越好，其实测镜质体反射率Ro值抑制程度越显著。东营凹陷的洼陷区沙三下亚段富有机质泥页岩现今真实成熟度（等效镜质体反射率EqVRo）主要介于0.69%~1.05%，沙四上亚段富有机质泥页岩EqVRo值则主要介于0.74%~1.20%；综合地质与工程甜点条件的剖析，东营凹陷沙三下、沙四上亚段富有机质泥页岩基质型页岩油甜点区的现今真实成熟度EqVRo值为0.74%~1.20%，4个洼陷的深洼区均具有良好的基质型页岩油商业开发前景。Abstract: The matrix type shale oil will become the main contributer for increasing shale oil reserves and production in China. Maturity is an important factor for the controlling to the distribution of sweet spot area for matrix type shale oil. The vitrinite reflectance suppression ranges of continental organic rich shale with different organic matter type were analyzed, and the maturity limit of sweet spot area for continental matrix type shale oil was discussed taking the lower Es3 (third member of Shahejie Formation) and upper Es4 (fourth member of Shahejie Formation) sub-members of the Dongying Sag as a case study. The vitrinite reflectance suppression ranges of continental organic rich shale are positively correlated to organic matter types. The actual maturity (EqVRo) of organic matter rich shale of the lower Es3 in subsags of Dongying Sag was mainly at the range of 0.69%-1.05%, and that of the upper Es4 is mainly at the range of 0.74%-1.20%. Combining with the analysis of geological and engineering sweet spot conditions, the EqVRo of organic matter rich shale of both two sub-members range 0.74%-1.20%. The deeper areas of four sub-sags in the Dongying Sag all have favorable prospecting of commercial development for matrix type shale oil in the lower Es3 and upper Es4 sub-members.
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图 1 渤海湾盆地东营凹陷沙三下—沙四上亚段富有机质页岩镜质体反射率Ro、FAMM分析等效镜质体反射率EqVRo与深度的关系
Figure 1. Vitrinite reflectance(Ro) and equivalent vitrinite reflectance(EqVRo) of FAMM analysis of organic rich shale from lower Es3 to upper Es4 sub-member vs. depth in Dongying Sag, Bohai Bay Basin
图 2 渤海湾盆地东营凹陷沙三下—沙四上亚段富有机质页岩埋深、成熟度与游离油含量的关系
Figure 2. Depth/maturity vs. the contents of free oil S1 of organic rich shale from lower Es3to upper Es4 sub-member in Dongying Sag, Bohai Bay Basin
图 3 渤海湾盆地东营凹陷沙三下—沙四上亚段富有机质页岩埋深/成熟度与孔隙度的关系
Figure 3. Depth/maturity vs. the porosity of organic rich shale from lower Es3 to upper Es4 sub-member in Dongying Sag, Bohai Bay Basin
图 4 渤海湾盆地东营凹陷沙三下—沙四上亚段富有机质页岩长石溶蚀孔微观特征
Figure 4. Microscopic characteristics of feldspar dissolution pore of organic rich shale from lower Es3 to upper Es4 sub-member in Dongying Sag, Bohai Bay Basin
图 5 渤海湾盆地东营凹陷沙三下—沙四上亚段富有机质页岩埋深/成熟度与伊利石、伊/蒙混层相对含量的关系
Figure 5. Depth/maturity vs. the relative contents illite and illite/smectite mixed layer of organic rich shale from lower Es3 to upper Es4 sub-member in Dongying Sag, Bohai Bay Basin
表 1 我国典型陆相富有机质泥页岩镜质体反射率Ro、FAMM分析等效镜质体反射率EqVRo分析结果对比
Table 1. Contrast of vitrinite reflectance(Ro) and equivalent vitrinite reflectance(EqVRo) from Fluorescence Alteration of Multiple Macerals (FAMM) analysis of typical continental organic rich shale in China
井号 深度/m 岩性 有机质类型 Ro/% EqVRo/% (EqVRo-Ro)/% 备注 井号 深度/m 岩性 有机质类型 Ro/% EqVRo/% (EqVRo-Ro)/% 备注 L225 2 240.5 泥岩 Ⅱ1 0.41 0.61 0.20 东营凹陷 T73 3 377.0 泥岩 Ⅱ1 0.64 0.82 0.18 东营凹陷 L242 2 433.3 泥岩 Ⅱ1 0.54 0.71 0.17 T73 3 403.0 泥岩 Ⅱ1 0.67 0.86 0.19 L108 2 479.0 页岩 Ⅰ 0.36 0.68 0.32 Y182 2 506.0 泥岩 Ⅱ2 0.53 0.68 0.15 Y93 2 562.4 泥岩 Ⅱ1 0.43 0.62 0.19 W7 2 630.0 页岩 Ⅰ 0.40 0.76 0.36 B11 2 593.0 泥岩 Ⅱ1 0.6 0.75 0.15 W35 2 172.0 页岩 Ⅰ 0.30 0.65 0.35 N5 2 598.0 泥岩 Ⅰ 0.48 0.77 0.29 W128 3 731.0 页岩 Ⅰ 0.78 1.08 0.30 C371 2 757.8 页岩 Ⅱ1 0.55 0.78 0.23 X17 3 372.0 页岩 Ⅱ1 1.05 1.29 0.20 泌阳凹陷 B417 2 844.0 泥岩 Ⅰ 0.42 0.73 0.31 B334 2 506.5 泥岩 Ⅰ 0.49 0.80 0.32 Y93 2 865.16 页岩 Ⅰ 0.42 0.73 0.31 B334 3 008.4 泥岩 Ⅱ1 0.76 1.10 0.29 L242 2 921.8 泥岩 Ⅱ1 0.57 0.73 0.16 B96 1 706.4 泥岩 Ⅱ1 0.43 0.62 0.17 H88 3 050.0 泥岩 Ⅱ1 0.54 0.73 0.19 B115 2 665.8 泥岩 Ⅰ 0.52 0.82 0.35 N33 3 133.0 泥岩 Ⅱ1 0.53 0.77 0.24 B216 2 803.4 泥岩 Ⅱ2 0.73 0.87 0.13 Y921 3 159.06 泥岩 Ⅱ1 0.58 0.79 0.21 B194 2 088.0 泥岩 Ⅱ1 0.50 0.76 0.26 Y891 3 187.6 泥岩 Ⅱ1 0.52 0.80 0.28 B296 2 414.3 泥岩 Ⅱ1 0.50 0.76 0.21 W54 3 241.4 页岩 Ⅰ 0.5 0.81 0.31 B296 3 180.8 泥岩 Ⅰ 0.61 0.99 0.39 S122 3 402.2 泥岩 Ⅱ1 0.63 0.85 0.22 Y1 1 502.3 泥岩 Ⅱ1 0.38 0.69 0.26 W57 3 423.22 页岩 Ⅰ 0.6 0.92 0.32 B143 2 546.0 页岩 Ⅱ1 0.52 0.80 0.27 FS1 3 686.6 泥岩 Ⅱ1 0.67 0.94 0.27 B143 2 891.9 泥岩 Ⅰ 0.61 0.92 0.30 W78 3 732.57 页岩 Ⅱ1 0.61 0.83 0.22 B144 2 492.4 泥岩 Ⅱ1 0.43 0.67 0.22 L64 3 795.0 泥岩 Ⅱ1 0.68 0.97 0.29 B69 2 082.4 泥岩 Ⅱ1 0.50 0.76 0.25 W78 3 905.2 页岩 Ⅱ2 0.85 0.98 0.13 W37 1 337.8 泥岩 Ⅱ2 0.49 0.59 0.08 L225 2 024.2 泥岩 Ⅲ 0.52 0.54 0.02 B123 974.3 泥岩 Ⅱ2 0.46 0.58 0.10 N38 2 790.0 泥岩 Ⅲ 0.62 0.65 0.03 B138 1 083.6 泥岩 Ⅱ1 0.39 0.62 0.19 L38 2 805.0 泥岩 Ⅱ1 0.49 0.66 0.17 B215 1 532.6 泥岩 Ⅱ1 0.39 0.66 0.24 L38 3 046.0 泥岩 Ⅱ1 0.54 0.74 0.20 B215 2 111.8 泥岩 Ⅰ 0.44 0.78 0.34 L38 3 188.0 泥岩 Ⅱ1 0.58 0.79 0.21 766.98 泥岩 Ⅱ2 0.64 0.74 0.10 松辽盆地 L38 3 253.0 泥岩 Ⅱ1 0.64 0.82 0.18 1 305.6 泥岩 Ⅱ1 0.72 0.89 0.17 L38 3 310.0 泥岩 Ⅰ 0.53 0.85 0.32 1 929.9 泥岩 Ⅱ2 0.81 0.89 0.08 T73 2 497.0 泥岩 Ⅱ2 0.47 0.6 0.13 1 446.1 泥岩 Ⅱ1 0.78 0.96 0.18 T73 2 893.0 泥岩 Ⅱ1 0.46 0.68 0.22 1 969.4 泥岩 Ⅲ 1.10 1.10 0.00 T73 2 994.0 泥岩 Ⅰ 0.50 0.80 0.30 1 641.5 泥岩 Ⅱ2 0.91 1.07 0.16 
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表 2 渤海湾盆地东营凹陷各洼陷区沙三下—沙四上亚段富有机质泥页岩现今主要埋藏深度
Table 2. Main burial depth of organic rich shale in lower Es3 and upper Es4 sub-members in sub-sags of Dongying Sag, Bohai Bay Basin
富有机质泥页岩层位 现今主要埋藏深度/m 利津洼陷 民丰洼陷 牛庄洼陷 博兴洼陷 沙三下亚段顶 3 000~3 600 3 000~3 200 2 800~3 400 2 800~3 200 沙三下亚段底或沙四上亚段顶 3 200~3 900 3 200~3 500 3 000~3 600 3 000~3 400 沙四上亚段底 3 500~4 200 3 500~3 800 3 000~3 900 3 200~3 700
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表 3 渤海湾盆地东营凹陷沙三下、沙四上亚段富有机质泥页岩全岩矿物组成
Table 3. Mineral components of whole rocks of organic rich shale of lower Es3 and upper Es4 sub-members in sub-sags of Dongying Sag, Bohai Bay Basin
% 层位 黏土矿物 石英 长石 方解石 白云石 黄铁矿 菱铁矿 样品数/个 沙三下亚段 8.0~54.0/26.0 6.0~50.0/29.1 0~35.0/4.2 1.0~68.0/34.1 0~72.0/3.9 0~13.0/2.5 0~3.0/0.3 230 沙四上亚段 3.0~73.0/24.0 0~66.0/28.5 0~42.0/4.9 0~89.0/33.9 0~87.0/7.8 0~14.0/2.3 0~12.0/0.3 890 注：表中数据据文献[26]；意义为最小值~最大值/平均值。
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