【摘要】 松辽盆地主要经历了伸展构造期和反转构造期两个构造时期,形成了复杂的构造裂缝组系。裂缝以垂直和高角度倾斜缝为主,力学性质表现为张性缝。虽然存在多组裂缝方向,但以东西向裂缝占优势,其次为北东和南北向裂缝。裂缝形成时期主要在反转构造期的挤压应力作用下形成,裂缝的发育主要受岩性、岩层厚度和构造部位的控制。在现今地应力作用下,东西向裂缝有效程度高,成为影响三肇地区注水开发的主要裂缝组系。更多还原

【Abstract】 The Songliao Basin experienced the extensional and reversal tectonic stages, which resulted in a complex structural fracture system. Fractures are mainly vertical ones with the characteristics of tensional fractures. Fractures extend in the EW, NE and SN directions and they are considered to have formed mainly in the reversal tectonic stage under the action of compressional stress. The abundance of fractures is controlled by lithology, rock thickness and structural position. Under the present stress, the EW fractures play an important role in waterflooding of the Sanzhao depression.更多还原