地球物理技术在天然气水合物预测中的应用

Based on the sensitivity of geophysical response to gas hydrates contained in sediments, we studied the prediction of gas hydrates with seismic techniques, including seismic attributes analysis, AVO, inverted velocity field construction for dipping formations, and pseudo-well constrained impedance inversion. We used an optimal integration of geophysical techniques results in a set of reliable and effective workflows to predict gas hydrates. The results show that the integrated analysis of the combination of reflectivity amplitude, instantaneous phase, interval velocity, relative impedance, absolute impedance, and AVO intercept is a valid combination of techniques for identifying the BSR （Bottom Simulated Reflector） from the lower boundary of the gas hydrates. Integration of seismic sections, relative and absolute impedance sections, and interval velocity sections can improve the validity of gas hydrates determination. The combination of instantaneous frequency, energy half attenuation time, interval velocity, AVO intercept, AVO product, and AVO fluid factor accurately locates the escaped gas beneath the BSR. With these conclusions, the combined techniques have been used to successfully predict the gas hydrates in the Dongsha Sea area.     

PBL-CBL联合教学法在地理高考专题复习中的应用——以“大气”专题为例

根据地理考试评价体系，新高考改革后的地理试题多以真实情境下的实际问题为载体，考查要求也更加注重对学生关键能力与地理核心素养的考查。PBL-CBL联合教学法基于真实案例分析，以问题为导向，能够引导学生在小组合作探究的过程中构建知识框架。本文将PBL-CBL联合教学法应用于“大气”专题的复习，以极端高温为例，通过提出问题、创设情境、问题探究、案例研讨和评价反思等环节设计专题课程，旨在触发学生的深入学习，提高高考备考效率。