Citation: | LI Kuayue, NENG Yuan, HUANG Shaoying, DUAN Yunjiang, HOU Xiaoxiao, HU Jianning, FU Yonghong, JIANG Shuai. 2024. Distribution characteristics and genesis of unconformity surfaces from Late Ordovician to Jurassic in Tarim Basin. Sedimentary Geology and Tethyan Geology, 44(2): 351-368. doi: 10.19826/j.cnki.1009-3850.2024.04004 |
The study of unconformity holds significant guiding importance for basin evolution, paleogeomorphology reconstruction, and oil and gas exploration. Affected by multiple tectonic activities, various types of unconformities have developed in the Tarim Basin. Through the analysis of seismic profile data, the distribution and structural characteristics of the unconformity surfaces formed during the Late Ordovician to Jurassic period in the Tarim basin are studied, and their tectonic mechanisms are discussed. The results show that: (1) The types of unconformity structures in the Tarim Basin are mainly parallel, truncation, fold, fault-fold, superimposed-overlap, single-overlap, and heterogeneous unconformity. (2) The bottom boundary of the Silurian exhibits the development of fault-fold, fold, truncation, superimposed-overlap, single-overlap, and parallel unconformity, distributed in an east-west belt. There is a development of a wide range of angular unconformity in the middle and south of the basin, a development of parallel unconformity in the middle and north of the Awati-Mangar depression, and a development of a small range of angular unconformity in the Tabei uplift.The Devonian-Carboniferous bottom boundary exhibits the development of parallel, truncation, fault-fold, single-overlap, superimposed-overlap, and heterogeneous unconformity, and the plane distribution has the characteristics of north-south symmetry with the axis of the connection of sedimentary centers in the Northern depression. The bottom boundary unconformity of the Triassic exhibits the development of superimposed-overlap unconformity, low-angle truncation unconformity, and parallel unconformity from north to south, reflecting the closed orogenic movement of the southern Tianshan Ocean in the northern margin of the basin in the late Hercynian. A development of fold, truncation, superimposed overlap, and heterogeneous unconformity exhibits in the bottom boundary of the Jurassic, with the axis-like symmetrical distribution of the sedimentary center line in the Manjiaer-Yingjisu depression. (3) The distribution characteristics of the unconformity surfaces reflect the differences in tectonic movements, the migration and activity of paleouplifts, and the controlling role of unconformity on hydrocarbon accumulation in the basin.
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Structural units (a) and key geological sections (b) of Tarim Basin
Stratigraphic comprehensive histogram of Tarim Basin (Lin et al., 2011; Liu et al., 2018; Cao et al., 2021)
Logging diagram of Jurassic and Carboniferous angular unconformity in Well MD1
Geological-Seismic profiles of platform-basin area in Tarim Basin (see Fig.1 for locations)
Unconformity structure style map of Tarim Basin (see Fig.1 for locations)
Feature map of main unconformity seismic profiles in Tarim Basin (see Fig.1 for locations)
Distribution map of unconformity surfaces between Silurian and underlying strata
Section A-B in southwestern Tarim (the Silurian top boundary flattend, see Fig.7 for the location)
Distribution of unconformity surfaces between Devonian−Carboniferous and underlying strata
Distribution map of unconformity surfaces between Triassic and underlying strata
Distribution map of unconformity surfaces between Jurassic and underlying strata
The north−south evolutionary profile of Tarim Basin (see Fig. 1 for the location, where 'L4' is marked)
Pattern map of regional tectonic evolution (excluding the alterations of the basin boundary)