岩石解吸气测定仪在页岩气勘探中的应用

Application of rock desorbed gas determinator in shale gas exploration

页岩储层的含气量决定了页岩气开发是否具有商业价值,是页岩勘探评价中的重要参数,也是页岩气实验测试的难点之一。现场解吸法是最直接和常用的测试方法,如何提高解吸气的测量精度,是准确评价页岩含气量的关键。在分析常规现场解吸仪器使用过程中测量精度低、自动化程度差的基础上,自行研制了岩石解吸气测定仪,阐述其方法原理,通过测量过程分析及页岩含气量计算方法探讨,证明含气性分析结果是有效的,并于2014年在CY1井成功进行了应用,为优选出"低风险区"提供了重要的依据。

As an important parameter as well as difficult problem in shale exploration, gas content of the reservoir determines whether the reservoir is economical for shale gas development. Field desorption is a direct and common method. Enhancement of absorbed gas measurement accuracy is critical for accurate evaluation of shale gas content. Conventional field desorption devices are less accurate and less automatic. Under such circumstance, a rock desorbed gas determinator has been independently developed. In this paper, the principles, measurement process and calculation of shale gas content of the determinator were presented, and it was verified that the determinator can produce reliable analysis results. The rock desorbed gas determinator was successfully deployed in Well CY1 in 2014, thereby providing valuable reference for identification of ＂low-risk zones＂.