川东南DS地区龙马溪组页岩裂缝发育特征及主控因素

川东南DS地区下志留统龙马溪组页岩裂缝发育,通过野外地质调查和典型取心井岩心观察,结合包裹体均一温度和X衍射等实验测试结果,对裂缝发育特征及主控因素进行研究。结果表明:研究区主要发育2期裂缝,Ⅰ期发生在燕山运动中晚期,主要受江南雪峰隆起NW向挤压,形成近EW向和SSE向平面X型共轭剪切缝和NE向剖面剪切缝;Ⅱ期发生在燕山运动末期—喜马拉雅期,主要受NE向挤压,形成NNE向和NEE向平面X型共轭剪切缝和NW向剖面剪切缝,该期为受川中古隆起、江南雪峰隆起和黔中隆起叠合作用影响。裂缝发育特征主要受构造作用和构造部位、岩石力学性质、岩性和矿物成分等因素影响,其发育程度与距断层的距离、岩石脆性矿物和粘土矿物含量、杨氏模量、泊松比等关系密切。

川东南DS地区龙马溪组页岩气形成及富集控制因素

为研究川东南DS地区页岩气富集情况,综合分析DS地区页岩气生气条件、储集空间以及保存条件,对该地区页岩气富集条件进行研究。结果表明:研究区页岩有机质类型以Ⅰ型干酪根为主,厚度大,TOC为2.00%～6.67%,Ro为2.20%～3.36%,处于过成熟产干气阶段;页岩有机质含量高,有机质孔及微裂缝发育,提供页岩气储集空间及横向渗流通道; DY2、DY4井埋藏深度适中,压力系数大于1.2,单井日产量分别为10.5×10~4m^3/d和20.0×10~4m^3/d,属高产页岩气井。通过对烃源、储集空间及保存条件的综合分析,认为有机质及孔隙发育、埋藏适中、压力系数大、保存条件良好的区域是页岩气有力勘探区。该研究可为今后相似地区的页岩气勘探提供借鉴。

A Different Light in Predicting Ungauged Basins： Regionalization Approach Based on Eastern USA Catchments

This paper reviewed the existing methods in regionalization studies to predict ungauged catchments and considering all the aspects a different methodology is developed, which is named as RDS method. ROPE （robust parameter estimation）-D （data depth）-S （spatial proximity） together gets this name RDS. Catchment properties and hydrological model parameters are used consistently to predict ungauged basin. This study explores the potential of the regionalization process to predict ungauged basins using the data of the Eastern USA catchments. Two conceptual rainfall-runoff hydrological models： HYMOD and HBV are used in this study. Analysis shows 95% success in predicting ungauged basins with HBV and 90% success with HYMOD. It is undoubtedly perceptible that RDS method is very effective in predicting ungauged basin and regionalization is independent of the conceptual rainfall-runoff model.