Paleo-Hydrogeomorphic Characteristics of EpisodeⅡof Middle Caledonian Movement and Their Controls on Karst Cave Development in Western Slope Area of Tahe Oilfield

doi:10.7657/XJPG20220202

Abstract

Abstract:

In order to understand the mechanism that the karstification during the Episode Ⅱof the Middle Caledonian movement controlled the development of karst caves in the Upper Ordovician coverage area in the western slope area of Tahe oilfield, the paleo-hydrogeomorphic and underground karst cave system of the Episode Ⅱ of the Middle Caledonian movement were precisely described using different methods. The results show that the karst platform is dominated by karst hills and depressions, the surface water system is dendritic, and the underground river-cave system is developed, forming an “open” underground river-karst system. The karst slope is dominated by hills and valleys, and deep incised valleys are developed because of strong vertical erosion, forming a “downward” buried fault-controlled karst system. The karst basin in the southern part of the platform margin is flat and the surface runoff is underdeveloped, with weak vertical erosion, but mainly horizontal dissolution, forming a “rising” buried fault-controlled karst system. Based on the paleo-hydrogeomorphic characteristics, the development model of karst caves under the control of special hydrogeomorphology of the Episode Ⅱof the Middle Caledonian movement was established for the Lianglitage formation coverage area in the western slope area of Tahe oilfield, which provides a geological basis for subsequent rolling development.

Key words: Tahe oilfield, Caledonian movement, paleo-hydrogeomorphy, karst cave, paleowater system, cave system, fault-controlled karst

CLC Number:

TE122.221

ZHANG Changjian, LYU Yanping, WEN Huan, WANG Zhen, MA Hailong. Paleo-Hydrogeomorphic Characteristics of EpisodeⅡof Middle Caledonian Movement and Their Controls on Karst Cave Development in Western Slope Area of Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2022, 43(2): 135-144.

Figures/Tables 9

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