Effects of Diagenetic Facies on Rock Electrical Properties in Tight Gas Sandstones
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摘要: 致密砂岩气层的研究是目前的研究前沿之一.利用铸体薄片、物性、高压压汞、micro-CT、岩电实验等分析化验资料，探讨了鄂尔多斯盆地定北地区二叠系太原组致密砂岩不同成岩相类型对岩电特征的控制作用.研究表明：研究区可以划分为4种成岩相类型，包括硅质胶结成岩相、高岭石部分充填成岩相、不稳定组分溶蚀成岩相，压实致密成岩相.4种成岩相类型地层因素和孔隙度在同一趋势线上，可以采用统一的a，m值.4种成岩相类型的n值有明显差异，取值依次为2.30、1.51、2.03和4.04.含气饱和度解释实例显示，对不同成岩相取不同n值与试气结果吻合较好，优于n值取理论值2的结果.Abstract: The research about tight gas sandstones is one the forefront research. In order to characterize rock electrical properties in tight gas sandstones of different diagenetic facies in Taiyuan Formation, Dingbei Area, we conducted casting thin sections, porosity and permeability, micro-CT and high pressure mercury intrusion/withdrawal method on these sandstones. Four diagenetic facies are observed in the area, namely, quartz cementation diagenetic facies, kaolinite partially filled diagenetic facies, unstable components resolution diagenetic facies and tight compaction diagenetic facies. The formation factor shows very good relationship with porosity regardless of diagenetic facies, hence a and m are set constant at 15.88 and 0.82 for all the diagenetic facies. Saturation exponent (n) are variable among the different diagenetic facies, 2.30, 1.51, 2.03 and 4.04 are selected repectively for the n value of the four diagenetic facies. Examples show that the chosen electrical parameters have good agreements with the gas production test, much better than the result of chosen the theoretical n value of 2.
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Key words:
- tight sandstone /
- diagenetic facies /
- rock electrical properties /
- logging /
- petroleum geology.
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图 1 不同成岩相微观照片
a.硅质胶结成岩相；b.高岭石部分充填成岩相；c.不稳定组分溶蚀成岩相；d.压实致密成岩相
Fig. 1. Photomicrographs of various diagenetic facies
图 2 不同成岩相类型泥质含量与粒度中值关系
Fig. 2. Clay content versus median grain diameter of different diagenetic facies
图 3 不同成岩相类型孔隙度与渗透率关系
Fig. 3. Air permeability versus porosity of different diagenetic facies
图 4 不同成岩相类型与各种参数的关系
a.不同成岩相类型地层因素和孔隙度的关系；b.不同成岩相类型胶结指数与孔隙度的关系；c.不同成岩相类型胶结指数与平均孔喉半径的关系；d.不同成岩相类型胶结指数与退汞效率的关系
Fig. 4. The relationship between porosity of different diagenetic facies
图 5 不同成岩相类型电阻率增大系数与含水饱和度的关系
Fig. 5. Resistivity index versus water saturation of different diagenetic facies
图 6 不同成岩相类型与各种参数的关系
a.不同成岩相类型饱和度指数和孔隙度的关系；b.不同成岩相类型饱和度指数和渗透率的关系；c.不同成岩相类型饱和度指数与平均孔喉半径的关系；d.不同成岩相类型饱和度指数和泥质含量的关系
Fig. 6. The relationship between porosity of different diagenetic facies
图 7 不同成岩相类型micro-CT扫描图
分辨精度分别为1.5、0.9和0.9 μm；a.硅质胶结成岩相；b.高岭石部分充填成岩相；c.不稳定组分溶蚀成岩相
Fig. 7. Micro-CT image of different diagenetic facies
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