Fracture-Cave System in Collapsed Underground Paleo-River With Subterranean Flow in Karst Canyon Area，Tahe Oilfield

doi:10.7657/XJPG20230102

Abstract

Abstract:

In order to study the development characteristics of paleokarst in the Middle-Lower Ordovician in the Tahe oilfield，by restoring the paleogeomorphology and the paleo-water system in the early Hercynian movement，the cave types in the karst canyon area were divided，and the genesis and evolution model of the collapsed fractures and caves with subterranean flow in the karst canyon area of the Tahe oilfield were established. The research results show that paleokarstification during the early Hercynian movement is found in the study area，the karst paleogeomorphology is generally high in the northeast and low in the southwest，the micro-geomorphology is mainly composed of low-amplitude karst mounds，karst peaks and depressions，and the paleo-water system is mainly composed of open channel flow，subterranean flow，underground river，and dry valley. The main water system shows a segmented structure consisting of deep incised meandering canyon in the south，canyon in the middle，and underground river-skylight in the north，and the tributary water system is a dendritic underground river network. The caves in the collapsed underground river with subterranean flow can be identified，mainly in four types，namely underground river，subterranean flow，undercurrent along river，and cave-through. The development and evolution of underground paleo-river system in the study area can be divided into free meandering flow，subterranean flow-deep incised meandering flow，and collapsed skylight subterranean flow.

Key words: Tahe oilfield, Ordovician, early Hercynian movement, underground river type, karst geomorphology, karst canyon, fracture-cave system

CLC Number:

TE122.23

ZHANG Changjian, LYU Yanping, MA Hailong, GENG Tian, ZHANG Xiao. Fracture-Cave System in Collapsed Underground Paleo-River With Subterranean Flow in Karst Canyon Area，Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(1): 9-17.

Figures/Tables 9

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