Origin and Evolution of West Slope Breaks of Qingshankou-Yaojia Formation in Northern Songliao Basin
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摘要: 沉积盆地的坡折带是非构造圈闭发育的最有利场所.地质、地球物理资料综合研究结果表明, 松辽盆地北部青山口-姚家组沉积时期西部明显发育富裕一级坡折带和泰康-大安二级坡折带.隐伏断裂、差异沉积与压实作用控制了坡折带的形成与演化.松辽盆地西部发育扎赉特旗、嫩江和哈拉海3个隐伏岩石圈断裂带, 坳陷期主要受松辽盆地北部物源、齐齐哈尔物源和英台物源影响, 扎赉特旗、嫩江岩石圈断裂带和齐齐哈尔、英台物源控制了富裕一级坡折带的形成和演化, 哈拉海隐伏岩石圈断裂带、松辽盆地北部和英台物源控制了泰康-大安二级坡折带的形成和演化.Abstract: The slope-break zone in sedimentary basin is a favorable area for the formation of stratigraphic traps. Based on integrated analysis of geological and geophysical data, origin and evolution of the west slope break of Qingshankou-Yaojia Formation in the northern Songliao basin are discussed. During depositional period of Qingshankou-Yaojia Formation, the western Fuyu first-order slope break and Taikang-Da'an second-order slope break are clearly developed in the west part of northern Songliao basin, the evolution of these slope breaks are controlled by deep buried faults, differential deposition and compaction. The Zhalaiteqi, Nenjiang, and Halahai great buried faults penetrating into lithosphere in west Songliao basin constrain the distribution of the slope break, which also control the distribution of lowstand sandbodies with the combination of multiple deposit sources from the northern Songliao basin, Qiqihar and Yingtai areas during depositional period of Qingshankou-Yaojia Formation. For example, the evolution of the Fuyu first-order slope break is controlled by the Zhalaiteqi, Nenjiang buried faults and Qiqihar and Yingtai sources, and the Taikang-Da'an second-order slope break is controlled by the Halahai buried faults and the northern Songliao basin, Yingtai sources.
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图 1 松辽盆地西部坡折带在地质剖面上的特征(镇3-五1井地质剖面)
Fig. 1. Characteristics of slope breaks on geological profile (Zhen3-Wu1), western Songliao basin
图 3 松辽盆地青山口—姚家组厚度及西部坡折带分布
Fig. 3. Isopach and distribution of west slope breaks of Qingshankou-Yaojia Formation, Songliao basin
图 4 松辽盆地西部坡折带分布与演化
1.盆地边界; 2.断裂; 3.钻井位置; 4.青山口一段坡折带; 5.青山口二、三段坡折带; 6.姚家组一段坡折带; 7.姚家组二、三段坡折带; 8.物源方向; ①.扎赉特旗断裂; ②.嫩江断裂; ③.哈拉海断裂; Ⅰ.北部物源; Ⅱ.齐齐哈尔物源; Ⅲ.英台物源
Fig. 4. Distribution and evolution of slope break in western Songliao basin
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