塔里木盆地塔河油田T区三叠纪沉积模式

doi:10.11743/ogg20190412

Abstract

Abstract: The Triassic sedimentary system in Block T of Tahe oilfield is rarely documented.Based on the sequence stratigraphic division, the core, logging and seismic facies, as well as normalized seismic waveform attributes were integrated to analyze the relationship between sedimentary systems and tectonic movements of the foreland basin, and to establish the Triassic sedimentary model of Block T in Tahe oilfield, Tarim Basin.The results show that the Triassic in Block T of Tahe oilfield can be divided into six long-term base-level cycles, inside which the braided river delta, fluvial and lacustrine se-dimentary facies are identified;the normalized seismic waveform attribute analysis shows that the braided river delta-lacustrine sedimentary system presents a migration from the near north-east to the north, while the fluvial sediments were deposited in a nearly east-west direction.During the active period of thrusting, the tectonic subsidence in the proximal realm of the basin resulted in the rapid proximal accumulation of a large amount of coarse-grained sediments, forming a braided river delta-lacustrine sedimentary system with a transportation direction approximately perpendicular to the orogenic belt;while during the quiescent period of thrusting, tectonic uplifting occurred in the proximal realm of the basin, the terrain grew gentle and the fluvial transportation got weak.As a result, the fine-grained sediments were deposited in the nearly EW-trending fault zones formed during the thrusting period, forming the fluvial sedimentary system with a sediment transportation direction approximately parallel to the orogenic belt.Therefore, the thrusting in the foreland basin ge-nerated two sedimentary models for the Triassic sedimentary system in Block T of Tahe oilfield, with transportation directions being approximately perpendicular to and parallel with the orogenic belt, respectively.The sedimentary models are of guidance value for the exploration and development of the Triassic clastic reservoirs in the Tarim Basin.

Key words: seismic attribute, braided river delta, sedimentary facies, sedimentary model, sedimentary system, Triassic, Tahe oilfield, Tarim Basin

CLC Number:

TE121.3

He Tingting, Duan Taizhong, Zhao Lei, Liu Yanfeng. Triassic sedimentary model in Block T of Tahe oilfield, Tarim Basin[J]. Oil & Gas Geology, 2019, 40(4): 822-834.

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Triassic sedimentary model in Block T of Tahe oilfield, Tarim Basin

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