页岩气地质评价关键实验技术的进展与展望

页岩气地质评价实验结果为页岩气地质"甜点"评价、地质选区、储量计算、水平井压裂层段优选及开发方案确定等提供了重要的数据基础与科学依据。近年来,随着我国页岩气勘探开发工作的不断深入,相关地质评价实验技术也取得了较大的进展。特别是在页岩微观孔隙结构、含气性和物性这3个方面,通过引进先进技术与自主设备研发相结合,建立了适用于我国海相页岩的分析测试技术和标准,对于推动我国页岩气的勘探开发进程发挥了重要的作用。为了给我国页岩气基础地质研究、实验室建设及相关标准制定提供参考和指导,归纳总结了国内外在上述3项页岩气地质评价关键实验技术方面所取得的进展,并对相关技术未来的发展趋势进行了展望。研究结果表明:①对于页岩微观孔隙结构测试,目前已经形成了多种手段相结合的定性观测和定量表征测试方法,实现了由静态表征向动态表征的转化,未来需要在页岩孔隙结构的原位表征和孔内流体赋存特征直接观测等方面做进一步的研究;②对于页岩含气性测试,目前已经建立了现场与室内相结合的含气性定量表征系列技术,实现了对页岩吸附气和游离气赋存特征的定量评价,未来需要在深层页岩损失气量计算、页岩气吸附机理及模型等方面做进一步的研究;③对于...

Progress and prospect of key experimental technologies for shale gas geological evaluation

The development of shale gas geological evaluation experimental technology is of great significance for shale gas "sweet spot"evaluation, geological selection, and reserves calculation. In recent years, with the development of shale gas exploration and development in China, such technology has made great progress especially in the three aspects of shale micro-pore structure, gas bearing property and petrophysical property. Through the combination of advanced technology introduction and independent development of equipments, the analysis and test technology and standards applicable to marine shale in China have already been established, which plays an important role in promoting the exploration and development of shale gas in China. In this regard, we systematically summarized the progress of the above three key technologies at home and abroad, and looks forward to development trends in the future. As for shale micro-pore structure tests, a variety of qualitative observation and quantitative characterization test methods have been formed, realizing the transformation from static to dynamic characterization, while further research needs to be done in the aspects of in-situ characterization of shale pore structure and direct observation of fluid occurrence characteristics in pores. As for shale gas bearing tests, a series of on-site and indoor gas bearing characterization technologies have been established to realize the quantitative evaluation of adsorbed and free gas occurrence characteristics in shale, while further research is needed in lost gas calculation for deep shale, shale gas adsorption mechanism and models. As for shale petrophysical property tests, the porosity and permeability test technology combined with various methods has been established to realize the quantitative evaluation of shale porosity effectiveness, but it is still necessary to carry out comparative research and unify the standards in terms of porosity test conditions and methods so as to meet the requirements of both research and production.