NE-trending faults are well developed in Tanggubasi Depression

Tarim Basin.Most of them can be divided into either southeastern basement-involved thrusting fault style or and a northwestern cover-decollement thrusting fault style

and present a huge arcuate faulting system bulging northwestward on map view.These NE-trending faults are mostly thrusting faults

but a few are characteristic of both thrust and strike-slip.Many faults show features of structural segmentation along strike

which are mainly displayed by the difference of main faults' thrusting directions and their related folds

and mainly located at the tail end of the arcuate structure.Meanwhile

most faults are characteristic of the layered superposition of multiple structural deformations vertically

and the major deformative layers concentrate in the Upper Cambrian-Ordovician sequences

and faults on the northwestern margin usually detach in the Middle Cambrian gypsolytes

while weak deformations are shown in other strata.The NE-trending fault system

a product of the collision between Tarim massif and North Kunlun-Altyn massif

is mainly developed during the late of Late Ordovician-earliest Silurian

and is an integral part of the Early Paleozoic foreland fold-thrust system of the Altyn-Cherchen faults on the southeastern margin of Tarim Basin.The formation of the NE-trending fault system is controlled by four factors

including the strike-slip and thrusting stress field of the major faults on the margin of Altyn-Cherchen

the distribution of the Cambrian gypsolyte weak layers

basement relief

and boundary fault strikes.The NE-trending fault belt locally controls the development of the Ordovician carbonate reservoirs of dissolution-fracture-cavity type and reef-shoal reservoirs at the platform margins.Favorable trap targets such as the fault zone wings can be selectively explored if the hydrocarbon source conditions are confirmed to be favorable.