科研之友
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摘要
The restoration of denudation is the basis of the restoration of paleostructure. It is of great significance for restoring the sedimentary stratigraphic framework of the basin, studying the migration of the basin uplift pattern, and the relationship of oil and gas distribution and accumulation. In the Tarim Basin, the largest sedimentary basin in China, the Middle-Lower Ordovician strata are rich in oil and gas resources. After some tectonic movements, they have severe uplift and erosion. This study identifies the five major tectonic movements of the Middle-Lower Ordovician top surface experiencing denudation in the Tabei area according to the idea of "same layers and multiple periods", and uses the "seismic stratigraphic synthesis method" to calculate its various amount of erosion during the main tectonic movements. By analyzing the erosion thickness map, it is considered that the erosion range of the Middle-Lower Ordovician top surface decreases from the Middle Caledonian to the Himalayan Period, and the maximum erosion thickness in the Middle Caledonian can reach 915 m, which is located near the current Yingmai 1 well. The maximum thickness of denudation in early hercynian reaches 892 m, which is located in the northern part of the present northern and northern regions. The maximum thickness of denudation in Late Hercynian is near the current Qigu-1 well, which can reach 690 m. The thickest point is located near Abei 1 well at present; the influence of the Himalayan Period on the unconformity is not as good as in previous periods, and the maximum erosion thickness is only 338 m, which is located near Shaya 6 well today. In terms of total erosion thickness, it can reach a maximum of 936 m and is located near Shun 13 well. The general trend of oil and gas migration is that under the condition of the continuous uplift of the northern part of the Tabei area, the oil and gas migrated along the three-dimensional drainage system centered on the Middle-Lower Ordovician top surface to the higher part of the northern part of the Tabei uplift. The favorable exploration area should be located in the ancient slopes of the Tabei uplift and the "liangbei" regions, just as the high-production oil gas flow was obtained in Manshen 1 well(in Shaya County)in the Tabei area.
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