RESERVOIR CHARACTERISTICS OF THE ORDOVICIAN WEATHERING CRUST AND SECTIONAL STRUCTURE IN ORDOS NO.7 WELL, THE ORDOS BASIN
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摘要: 鄂尔多斯盆地鄂7井奥陶系风化壳划分为3个岩溶带,即垂直岩溶带、水平岩溶带和深部岩溶带。风化壳储层的非均质性主要受岩溶控制,岩溶多孔带是本井风化壳的主要天然气储集层段。在研究各岩溶带特征的基础上,认为本井位于加里东期古岩溶斜坡的较低部位,而以西的鄂5井、鄂8井所在部位,是更具勘探前景的地区。Abstract: The Ordovician weathering crust in the area of No.7 drill well can be divided intothree karst beIts in the Ordos Basin,namely vertical,horizontal,and deep karst belts,Theinhomogeneity of reservoirs in the weathering crust is dominantly controlled by karstifica-tion and the karst porous belt in the weathering crust is rated as the major reservoir bedsof natural gas,Based on the characteristic study of each karst belt,No.7 drill well is locat-ed in the lower part of the Caledonian palaeo-karstificated slope,toward the west whereOrdos No,5 and No.8 wells are positioned could be more promising prospects for oil/gas.
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[1] 中国科学院地质研究所岩溶组.中国岩溶研究.北京:科学出版社,1979 [2] 任美得,刘振中主编.岩溶学概论.北京:商务印书馆,1983 [3] 成都地质学院沉积地质矿产研究所,长庆石油勘探局勘探开发研究院译编.古岩溶与油气储层.成都科技大学出版社,1990 [4] 包茨主编.天然气地质学.北京:科学出版社,1986
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