鄂尔多斯盆地南部奥陶系古岩溶发育控制因素及展布

鄂尔多斯盆地南部奥陶系碳酸盐岩经历了多期次、多类型古岩溶作用和改造,古岩溶的发育主要受古构造背景、岩性组合特征以及古地质、古地貌形态的共同控制,尤以古地质和古地貌的控制作用最为重要.在"野外填图法"、"印模法"与"残厚法"研究的基础上,充分应用了地震相追踪和地震解释的成果,对鄂尔多斯盆地南部的古地质和古地貌形态进行了详...

Controlling Factor and Distribution of Paleo-karst Development in Ordovician of Southern Ordos Basin

The Ordovician carbonate suffers from multi-stage and multi-type paleo|karst in south of Ordos basin. The development of paleo-karst is controlled by ancient tectonic setting, lithologic association characteristics, and especially ancient geology and landform. On the basis of field mapping method, impression method, residual thickness method, and according to the result of  seismic facies trace and seismic interpretation, the paper depicts ancient geology and ancient landform in detail in south of Ordos basin. From south to north, ancient landform is divided into karst highland, karst platform and eroded slope. The eroded slope is furthermore divided into the erosion shallow grooves, erosion pits, karst hills and karst beams. Due to the different paleo|karst background and paleohydrologic conditions, the distribution of favorable areas is obviously different.