塔里木盆地塘古巴斯坳陷北东向断裂带特征、成因及石油地质意义

doi:10.11743/ogg20180511

Abstract

Abstract: 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.

Key words: NE-trending fault, structural style, genetic mechanism, petroleum geology, fault belt, Tanggubasi Depression, Tarim Basin

CLC Number:

TE121.2

Liu Shilin, Zhang Zhongpei, Yun Jinbiao, Li Huili, Gao Shanlin, Li Jianjiao. NE-trending fault belts in Tanggubasi Depression of the Tarim Basin: Features,genetic mechanism,and petroleum geological significance[J]. Oil & Gas Geology, 2018, 39(5): 964-975.

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NE-trending fault belts in Tanggubasi Depression of the Tarim Basin: Features,genetic mechanism,and petroleum geological significance

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