Ordovician Karst Paleogeomorphology During Early Hercynian Movement in Tahe Oilfield

doi:10.7657/XJPG20200503

Abstract

Abstract:

Using a large amount of geological and geophysical data, the genetic process of the Ordovician karst paleogeomorphology during the Early Hercynian movement in the Tahe oilfield was investigated from the point of tectonic deformation by means of logging-seismic combination, stratigraphic interpretation and 3D modeling. The results show that there are two Paleozoic intervals with distinct deformation. The upper is a Cambrian-Ordovician carbonate formation showing as a gentle anticline, and the lower is a Carboniferous-Permian clastic formation showing as a fold chain overlying the Ordovician. The “impression method” isn’t suitable for the restoration of the paleokarst landform in the study area. Instead, we built a structural equivalent arc curve equation based on the present Ordovician top structural geomorphology, and used the equal arc length integral method to effectively remove the structural deformation after the karst period and restored the paleogeomorphology according to the compression ratio of different structural stages. The karst paleogeomorphology during the Early Hercynian movement was high in the north and low in the south, plunging to the west and rising to the east. The structure relief was 70% of the present one, showing a successive development feature. The complete and independent karst system is composed of two high and steep banded hoodoos-uplands, a lower karst depressions with a dustpan shape and a flat and open karst lake in the south of study area.

Key words: Tabei uplift, Tahe oilfield, Ordovician, Hercynian movement, karst paleogeomorphology, impression method, equal arc length integral method

CLC Number:

TE122.14

ZHANG San, JIN Qiang, ZHAO Shenzhen, SUN Jianfang, LI Yongqiang, ZHANG Xudong, CHENG Fuqi. Ordovician Karst Paleogeomorphology During Early Hercynian Movement in Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(5): 527-534.

Figures/Tables 6

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