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贝尔凹陷是海拉尔盆地中南部一个重要的早白垩世伸展断陷,受早期伸展作用和后期张扭作用的影响,走滑断层非常发育。利用地震剖面、时间切片等资料,首先分析了贝尔凹陷走滑断层的典型构造特征,由此识别出3组主要的走滑断层。然后探讨了贝尔凹陷走滑断层的成因机制,认为其发育受到早期基底伸展断层和后期张扭应力场的双重控制。在此基础上,提出了贝尔凹陷北部纯剪旋转、中南部单剪非旋转的走滑断层发育模式,即贝尔凹陷北部霍多莫尔地区发生岩石纯剪切变形,发育北东向和北北西向的共轭走滑断层,形成走滑旋转构造,而贝尔凹陷中南部的苏德尔特地区和敖脑海地区则发生岩石简单剪切变形,发育北东东向走滑断层。贝尔凹陷走滑断层可以提供有效圈闭并改善储层物性,有助于油气成藏。
The Beier sag is an important Early Cretaceous extensional fault depression in the central-southern Hailar Basin. Due to the effects of early extensional and late twisting, the strike-slip fault is well developed. Based on the data of seismic sections and time slices, the tectonic features of the strike-slip faults in Beier sag are analyzed firstly, and three major strike-slip faults are identified. Then, the genesis mechanism of the strike-slip fault in the Beier sag is discussed, and the development of the strike-slip fault in the Beier sag is considered to be controlled by both the early basement extension fault and the post-tension and torsional stress field. On this basis, the authors propose a single shear non-rotational strike-slip fault development model in northern Beier sag, that is, pure shear deformation of the rock in the Khodormor region of the northern Beier sag, developing north-east and north-north-west To the conjugate strike-slip fault to form a strike-slip rotation structure. However, simple shear deformation of the rocks and development of the NE strike strike-slip fault occur in the Sudeerte area and the Ao headwater area in central-southern Beier sag. The strike-slip faults in the Beier sag can provide effective traps and improve the physical properties of reservoirs, contributing to hydrocarbon accumulation.