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轮南地区奥陶系古岩溶包括风化壳岩溶、构造岩溶和埋藏岩溶三种类型,可划分为四套。风化壳岩溶是轮南地区古岩溶的主体,也是本区主要含油气储集体。古岩溶表现为地震低速带,各类岩溶和岩溶带在约束反演地震剖面上都有明显识别标志。轮南古岩溶具有两个基本特征:(1)岩溶体系的主体风化壳岩溶是在海进过程中形成的;(2)岩溶期后经过了挤压碎裂变形改造,形成地垒、断块林立的景观格局。它既不同于海退过程中形成的风化壳岩溶,也与岩溶期后地质环境稳定,基本保持形成时原貌的岩溶有明显区别,同时也有异于华北冀中坳陷经受强烈拉张改造而古潜山耸立的古岩溶面貌,建议将其称为轮南型古岩溶。
The Ordovician paleokarst in Lunnan area includes three types of weathering crust karstification, tectonic karstification and buried karst, which can be divided into four sets. Weathered crust karst is the main ancient Lunan area karst, but also the main oil and gas reservoirs in this area. Paleo-karstification is characterized by low-velocity seismic zone, and all types of karst and karst belt have obvious identification marks on constrained seismic sections. Lunnan paleokarst has two basic characteristics: (1) the main weathering crust karstification of karst system is formed during the sea-in process; (2) after karstification, it has been crushed and deformed to form the basement, fault block Lined landscape pattern. It is not only different from the weathering crust karst formed during the sea-regreasing process but also distinct from the karst geology stable after the karst period and maintaining the original appearance of the karst formation. At the same time, Ancient karst mountain appearance, it is proposed to call it Lunan type ancient karst.