Types and models of supergene karst of Ordovician and reservoir characteristics in Ordos basin
SU Zhong-tang
LIU Na
YANG Wen-jing
HU Shang-cai
WU Chun-ying
PEI Wen-chao
REN Jun-feng
Abstract：Supergene karst reservoirs of Ordovician in Ordos is the most important type of carbonate reser-voirs,while some breakthrough cannot be explained perfectly,indicating existence of different types of karst.Based on the analysis of paleotopography and cores and slices,this study suggests that the supergene karst of Ordovician can be divided into weathering crust karst and bedding karst,which include 4 subclasses in accordance with surrounding rocks.The characters of the weathering crust karst are different because of different rock fabric,while the easily dissolved component of rocks is dissolved preferentially when the bed-ding karst occurs.The weathering crust karst reservoirs are controlled by paleotopography and karst cycles as well as sedimentary facies,while paleotopography and sedimentary facies as well as grooves and fractures need to be considered when bedding karst reservoirs are forecasted.
Keywords：weathering crust karstbedding karstkarst modeldissolution mechanismkarst reservoir
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 109-114 )