塔中低凸起的构造属性和解释方法

doi:10.11743/ogg20110517

Abstract

Abstract:

Tazhong low salient is part of the foreland thrusting system in the southeastern Tarim Basin from Middle Ordovician to early Late Devonian.During this geologic period,the faults in Tazhong area were dominated by north-dipping and thrusts,and might intersected the deep north-thrusting major fault,forming a north-propagating wedge structure front.The low salient in Tazhong area experienced multistage tectonic movements,resulting in different structural geometries in different stratigraphic units.For example,NW-trending compressional fault-related folds dominate the Sinian-Ordovician structural layer;NE-trending negative flow structures and pull-apart grabens are predominant in the Silurian-Devonian structural layer;while positive flow structures and collapse structures resulted from magma invasion or diaper are prevalent in the Carboniferous-Permian structural layer.The early structures are commonly destroyed by the later structures duo to multistage faulting,making it difficult to identifying them on seismic section.Therefore,structure interpretation should be based on the seismic profiles with approximate the same vertical and horizontal scales,so as to correctly define the deformation features in these structural layers and extrapolate into areas where seismic data quality is low.

Key words: structural property, forebulge, structural layer, fault interpretation, Tazhong Low Salient area

CLC Number:

TE121.2

Guan Shuwei, Yang Haijun, Han Jianfa, Li Benliang, Luo Chunshu. Structural properties and interpretation methods of the Tazhong Low Salient[J]. Oil & Gas Geology, 2011, 32(5): 777-786.

References

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Structural properties and interpretation methods of the Tazhong Low Salient

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