【摘要】 鄂尔多斯盆地西南缘奥陶系风化壳岩溶储层是盆地西南缘下古生界天然气勘探的主要层位。通过对盆地西南缘钻井岩心、录井、测井、试气资料的分析,结合部分古地理资料,对盆地西南缘风化壳岩溶带进行了划分。同时以富探1井和旬探1井为例,在垂向上进行了分带,自上而下分为垂直渗滤溶蚀带、水平潜流溶蚀带和深部缓流溶蚀带;结合鄂尔多斯盆地西南缘前石炭纪古岩溶地貌图对盆地西南缘风化壳岩溶特征进行了分析,并对盆地西南缘风化壳储层特征及其控制因素进行了研究,揭示了风化壳岩溶储层发育规律。更多还原

【Abstract】 In southwestern Ordos Basin, some weathering crust karst reservoirs are the main targets for exploration of the Lower Paleozoic gas. In this study, many data from drilled core, mud logging, well logging and gas testing are analyzed, and the weathering crust karst zones are classified based on some paleogeographical information. After that, taking both Futan 1 and Xuntan 1 wells as examples, three karst zones are divided from above, including vertical seepage one, horizontal subsurface-flow one and deep sluggish one. In addition, the characteristics of weathering curst karst are summed up according to a paleokarst geographical map before Carboniferous, and the karst reservoirs’characteristics and their controlling factors are studied. Finally, their growth laws are also found out.更多还原