四川盆地龙马溪组与筇竹寺组页岩孔缝网络特征对比及其对页岩气潜力的影响

四川盆地龙马溪组与筇竹寺组页岩在页岩气潜力和对常规油气藏的贡献方面具有明显差异，其原理涉及高成熟度且具复杂构造演化史的富有机质页岩中超压的释放机制，本项目将从如下几个方面开展工作：（1）高熟页岩中纳米—宏观级孔缝网络的展布状况；（2）高熟页岩孔缝网络内部流体及固体的充填特征；（3）构造热演化对页岩孔缝网络特征的影响；（4）孔缝网络特征对高熟页岩产气潜力的影响，对比分析四川盆地龙马溪组与筇竹寺组页岩的页岩气潜力。从技术手段上讲，主要包含以岩芯扫描、显微镜观察、场发射电镜观察、原子力显微镜、透射电镜及Nano-CT为主的图像学联合表征技术，结合核磁共振、电子探针微区分析及软X线谱学显微技术的微区成分分析手段及以PCAS、JMicrovison为主等计算机数据处理技术，实现宏观—微观，二维—三维，定量化、系统化的研究尺度。

As gas shale or source rock of conventional oil and gas, there are dramatic differences between Longmaxi Shale and Qiongzhusi Shale in Sichuan Basin. The reasons of these differences probably relate to mechanism of overpressure-release in overmatured organic-rich shale. This project is focused on: (1) Distribution of nanoscale-macroscale pores and fractures in shales; (2) Characteristics of fluids and solids in pore and fracture system; (3) The influences of tectonic and thermal evolution to pore and fracture system in shale; (4) The influences of characteristic of pore and fracture system to shale gas potential of overmatured shales in Sichuan Basin which are in certain Longmaxi Shale and Qiongzhusi Shale in this project. This project combines image analysis which contains core sample scanning, microscopy, scanning electron microscopes (SEM), transmission electron microscopes (TEM), atomic force microscopes (AFM) and Nano-CT, micro area analysis which contains nuclear magnetic resonance (NMR), electron probe microanalysis (EPMA), Scanning transmission X-ray microscopy (STXM), and image processing software such as Pores (Particles) and Cracks Analysis System (PCAS) and JMicrovison. With these approaches, macroscale to microscale, two-dimension to three-dimension, quantified and systemized study is accomplished.