Research on rock mechanics parameters of the Jurassic-Cretaceous reservoir in the Sikeshu sag, Junggar Basin, China
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摘要: 随着准南前陆中生界油气勘探持续突破，构造解析与储层评价越来越重要，与二者密切相关的岩石力学参数研究却鲜有涉及。针对准南前陆四棵树凹陷侏罗系—白垩系岩芯、测井、地震资料现状，结合三轴岩石力学实验和三维岩石力学反演方法，明确研究区岩石力学参数特征。结果表明：研究区储层动、静态杨氏模量和泊松比均呈正相关线性关系，岩石力学参数受岩性变化控制，白垩系清水河组下部与侏罗系头屯河组、西山窑组、八道湾组杨氏模量较高、泊松比较低，白垩系清水河组上部、侏罗系三工河组杨氏模量较低、泊松比较高；随着杨氏模量增加、泊松比降低，岩石抗压强度增加。基于高泉地区岩石力学参数反演结果表明，杨氏模量越大、泊松比越小，裂缝发育指数越高，越容易形成裂缝。白垩系清水河组上部、侏罗系三工河组裂缝发育指数小于0.4，裂缝不发育、油气显示差；白垩系清水河组下部、侏罗系西山窑组与头屯河组裂缝发育指数大于0.4，裂缝发育、油气显示好，因此此研究成果对研究区深层油气勘探具有重要指导意义。Abstract: Structural analysis and reservoir evaluation has become increasingly important as petroleum exploration keeps making breakthroughs in the foreland of the southern Junggar Basin. However, the research on rock mechanical parameters which is closely related to them is rare. Based on the drilling core data, logging and seismic data of the Jurassic-Cretaceous in the Sikeshu sag, using the rock mechanics experiment and three-dimensional rock mechanics inversion, we defined the rock mechanics parameters in this study. The dynamic and static Young′s modulus shows a positively correlated linear relationship with the Poisson′s ratio. The rock mechanical parameters are controlled by the lithological variation. The lower K1q and J2t, J2x, J1b Formations have a higher Young′s modulus and a lower Poisson′s ratio, while the upper K1q and J1s Formations have a lower Young′s modulus and a higher Poisson′s ratio. When the Young′s modulus increases and the Poisson′s ratio decreases, the rock compressive strength increases. The inversion results of rock mechanical parameters in the Gaoquan area show that the higher the Young′s modulus and the lower the Poisson′s ratio, the higher the fracture index. The fracture index of the upper K1q and J1s Formations is lower than 0.4, indicating poor fracture development and petroleum display; while the fracture index of the lower K1q and J2t, J2x, J1b Formations is higher than 0.4, suggesting good fracture development and petroleum display. Therefore, the research results are instructive for the deep petroleum exploration in the study area.
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Key words:
- rock mechanical parameters /
- fractures /
- Jurassic /
- Cretaceous /
- Junggar Basin /
- North Tianshan
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图 1 四棵树凹陷侏罗系顶面构造图
Figure 1. Plane structure of the superface of the Jurassic in the Sikeshu sag
图 2 高泉地区高102井动态岩石力学参数分布直方图
Figure 2. Distribution histogram of dynamic rock mechanical parameters of the Well Gao 102 in the Gaoquan area
图 3 四棵树凹陷侏罗系—白垩系岩石力学参数交汇图
Figure 3. Crossplot of the Jurassic-Cretaceous rock mechanical parameters for the Sikeshu sag
图 4 高泉地区不同岩性静态岩石力学参数反演评价
Figure 4. Evaluation of static rock mechanical parameters of different lithologies
图 5 高泉地区静态岩石力学参数反演剖面
Figure 5. Inversion profile of the static rock mechanical parameters for the Gaoquan area
图 6 四棵树凹陷侏罗系—白垩系岩石力学参数与抗压强度关系图
Figure 6. Relationship between rock mechanical parameters and compressive strength of the Jurassic-Cretaceous rocks in the Sikeshu sag
图 7 高泉地区侏罗系—白垩系岩石力学参数与裂缝响应关系图
Figure 7. Relationship between rock mechanical parameters and fracture response of the Jurassic-Cretaceous rocks in the Gaoquan area
表 1 四棵树凹陷侏罗系—白垩系致密砂岩储层动静态岩石力学数据
Table 1. Experimental data of dynamic and static rock mechanics of the Jurassic-Cretaceous tight sandstone reservoir in the Sikeshu sag
序号 井号 层位 样品编号 动态杨氏性模量/GPa 静态杨氏模量/GPa 动态泊松比 静态泊松比 1 高101 K1q 101-1 63.51 29.52 0.25 0.20 2 高101 J2t 101-2 47.86 22.56 0.20 0.20 3 高101 J2t 101-3 44.37 22.78 0.23 0.20 4 高101 J2t 101-4 43.37 21.51 0.23 0.20 5 高101 J2t 101-5 55.52 24.17 0.21 0.21 6 高101 J2t 101-6 53.64 25.52 0.26 0.22 7 高101 J1s 101-7 66.35 27.76 0.24 0.20 8 高101 J1s 101-8 55.56 27.18 0.24 0.21 9 高102 J2t 102-1 50.49 25.33 0.22 0.21 10 高102 J2t 102-2 57.18 25.41 0.23 0.21 11 高102 J2t 102-3 55.78 23.41 0.23 0.21 12 高泉5 J2t 5-1 29.70 10.98 0.23 0.22 13 高泉5 J2t 5-2 40.98 12.55 0.23 0.22 14 高泉5 K1q 5-3 59.38 29.55 0.21 0.19 15 高泉5 K1q 5-4 51.22 25.11 0.24 0.20 16 高泉5 K1q 5-5 50.50 28.19 0.25 0.24 17 高泉5 K1q 5-6 60.89 18.64 0.21 0.21 18 高泉5 J2t 5-7 42.65 20.16 0.21 0.19 19 高泉5 J2t 5-8 49.78 21.76 0.17 0.21 20 独山1 J3q 1-1 45.96 15.35 0.19 0.21 21 独山1 J3q 1-2 34.32 11.33 0.21 0.19 22 独山1 J3q 1-3 44.09 15.45 0.20 0.22 23 独山1 J3q 1-4 50.49 17.16 0.21 0.20 24 独山1 J3q 1-5 50.99 15.14 0.25 0.22 25 独山1 J3q 1-6 34.79 12.89 0.21 0.23 26 独山1 J3q 1-7 40.07 24.52 0.17 0.19 27 独山1 J3q 1-8 43.85 23.39 0.19 0.19 28 独山1 J3q 1-9 48.17 21.25 0.22 0.23 
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表 2 四棵树凹陷侏罗系—白垩系致密砂岩储层静态岩石力学实验数据
Table 2. Experimental data of static rock mechanics of the Jurassic-Cretaceous tight sandstone reservoir in the Sikeshu sag
序号 井号 井深/m 层位 长度/mm 直径/mm 重量/g 密度/(g/cm3) 围压/MPa 抗压强度/MPa 静态杨氏模量/GPa 静态泊松比 1 艾2 3520 J2x 50.47 25.08 64.72 2.60 49.30 282.21 0.228 2 卡8 3955 J2t 50.18 25.08 58.04 2.34 55.40 245.14 21.98 0.228 3 卡002 3992 J2t 49.58 25.03 56.68 2.32 55.90 228.14 21.18 4 卡002 3999 J2t 49.85 24.98 55.46 2.27 56.00 195.59 19.49 0.236 5 卡8 4074 J2t 49.95 25.06 64.06 2.60 57.0 309.96 29.58 6 卡002 4080 J2t 49.75 24.96 56.26 2.31 57.10 246.96 22.86 0.243 7 卡002 4126 J2x 50.45 25.08 58.40 2.34 57.80 273.06 22.96 0.246 8 卡7 4176 K1q 46.46 25.06 53.49 2.34 58.60 307.13 24.02 9 卡8 4228 J1b 50.11 25.13 63.72 2.57 59.20 410.56 34.21 10 独山1 6017 J2t 50.43 25.05 61.19 2.46 65.00 390.58 34.13 0.207 11 独山1 6413 J2t 45.39 25.03 57.23 2.56 65.00 320.64 0.221 12 独山1 6415 J2t 50.12 25.08 61.06 2.47 65.00 378.38 32.46 0.203
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