Zhenjia Cai, Luanxiao Zhao, Teng Long, Jiqiang Ma, Yang Wang, Yuhong Lei, Jiaquan Zhou, De-hua Han, Jianhua Geng
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引用次数: 0
摘要
尽管湖相页岩在源岩评价、非常规储层勘探与开发以及二氧化碳地质封存和核废料处理的密封完整性评价中发挥着重要作用,但对其弹性行为的实验研究仍然很少。我们对来自中国三个典型湖相盆地的 63 个富有机质页岩样本(长 7、青山口和芦草沟地层)进行了超声波速度测量。研究发现,长 7 号和青山口页岩对应的淡咸水湖相沉积环境的 P 波和 S 波速度主要受粘土和有机质含量的影响,而其弹性各向异性幅度则主要受粘土含量的影响。与盐湖湖相沉积环境相对应的卢卡沟页岩的 P 波和 S 波速度主要受总有机碳和孔隙度的影响,并表现出与有机质富集相关的微弱各向异性。指数定律很好地反映了盐湖和淡-咸水湖相页岩的各向异性大小与垂直于层理的速度之间的关系,但存在明显的差异,尤其是在低速时。层间弹性的差异对弹性各向异性的大小有深远的影响,并塑造了速度变化的趋势。
Elastic and anisotropic properties of organic-rich lacustrine shales: An experimental study
Experimental investigation of the elastic behaviours of lacustrine shales remains sparse, although they play an essential role in source rock evaluation, unconventional reservoir exploration and development, and the seal integrity evaluation for geological storage of CO2 and nuclear waste disposal. We make the ultrasonic velocity measurement of 63 organic-rich shale samples (Chang 7, Qingshankou and Lucaogou formation) from three typical lacustrine basins in China. It is found that the P- and S-wave velocity of Chang 7 and Qingshankou shale corresponding to the fresh-brackish lacustrine depositional environment is mainly impacted by the clay and organic matter content, whereas their elastic anisotropic magnitude is mostly influenced by clay content. The P- and S-wave velocities of Lucaogou shale corresponding to the saline lacustrine depositional environment are mainly affected by the total organic carbon and porosity and exhibit weak anisotropy linked to organic matter enrichment. Exponential law well captures the relationship between anisotropic magnitude and velocity perpendicular to bedding for both saline and fresh-brackish water lacustrine shales, although there exists notable discrepancy, particularly at low velocities. The disparity in elasticity between laminations has a profound impact on the magnitude of elastic anisotropy and shapes the trend of velocity variations.
期刊介绍:
Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.