Measurement of elastic properties of kerogen
Measurement of elastic properties of kerogen
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DOI：
10.1190/segam2013-1319.1
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Fuyong Yan;De‐hua Han
中科院分区：
文献类型：
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作者：
Fuyong Yan;De‐hua Han
Summary To have good understanding of elastic properties of organic shale, it is fundamental to know the elastic properties of its mineral components. Kerogen is the most important component of organic shale, but information about its elastic properties is scarce. We have measured ultrasonic velocities on 9 laboratory isolated kerogen samples from Green River shale in Colorado. From data measured on both dry and saturated samples, we can invert the bulk modulus of kerogen using the Gassmanm equation, Reuss bound and Voigt bound. The bulk modulus of kerogen is estimated to lie around 3.5-5 GPa. We have also argued that the shear modulus of kerogen is around half of the bulk modulus. Sample description and molding The process of isolating kerogen from source rocks is complicated and time consuming, thus kerogen samples are very precious. For some kerogen samples, only a very tiny amount (less than half of one gram) is available for ultrasonic measurement. The kerogen samples are mostly in the form of powder (Figure 1) and some are in the form of small chunks. The colors vary from brown to black. All the kerogen samples belong to Type I kerogen. These 9 samples are classified into two groups: five samples are brown and appear less oily, which seems to be in early maturation stage; the other four samples are in dark brown to black color and oily, which seems in later maturation stage as shown in Figure 2. And they are all from Green River basin, Colorado. Measurement equipment and procedure
