塔中北坡走滑断裂成因机理与油气成藏

doi:10.11743/ogg20180110

Abstract

Abstract: A series of NE trending strike-slip faults developed in northern sloped of Tazhong area.In order to unravel the forming mechanism and its implication on hydrocarbon accumulation of strike-slip faults, detailed analysis upon geometric styles of strike-slip faults was performed, and the evolutional process of NE trending slip-faults in northern Tazhong area was simulated by using physical analogue model method.The results show that development of different planar and sectional structural styles of strike-slip faults is induced by differential pushing and basement shear effect under simple contractional stress field.Segmentation of characteristics is also observed along faults trending.It is concluded by physical analogue results integrated with structural background analysis that the forming mechanism of strike-slip faults in northern slope of Tazhong area was controlled by two factors.Firstly, the segmentation of Tazhong I fault gave the northern slope of Tazhong area a differential pushing stress in NE direction at the late Caledonian-early Hercynian.Secondly, NE trending basement faults activity in northern Tazhong area resulted in basement shear effect, which drag overlying upper Ordovician, Silurian, Devonian strata sinistrally.The existence of NE trending strike-slip faults contribute to hydrocarbon accumulation in northern slope of Tazhong area.On the one hand, high-angle structural faults development induced by strike-slip faults connects reservoir sections.On the other hand, faulting of strike-slip facilitates multi-layers hydrocarbon accumulation in northern slope of Tazhong area.

Key words: segmentation, fault style, hydrocarbon accumulation, strike-slip fault, Tazhong area, Tarim Basin

CLC Number:

TE121.2

Ning Fei, Jin Zhijun, Zhang Zhongpei, Yun Jinbiao, Zhang Jibiao. Mechanism of strike-slip faulting and hydrocarbon accumulation in northern slope of Tazhong area[J]. Oil & Gas Geology, 2018, 39(1): 98-106.

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Mechanism of strike-slip faulting and hydrocarbon accumulation in northern slope of Tazhong area

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