松辽盆地梨树断陷下白垩统断层特征研究

Study on Fault Characteristics in Lower Cretacic in Songliao Basin in the Uplift Lishu Fault Depression

研究断层的性质,可以反映不同时期区域应力场的性质,而区域应力场与油气之间的关系又很密切。通过对松辽盆地东南隆起区梨树断陷不同时期的断裂进行数学统计分析,研究其走向和长度,对该地区的区域应力场进行分析。研究表明:梨树断陷经历了火石岭期的北西-南东向伸展,沙河子期的左行挤压,到营城期区域应力场达到最大,以北西-南东向伸展为主;其所处的特殊构造部位,反映和记录了东北亚构造域中生代以来构造体制和地球动力学环境的变革、转换和演化过程及其主要阶段。

To study the nature of the fault,it can reflect the nature of the different periods of the regional stress field,which are very close relationship between the regional stress field and the oil and gas.Mathematical and statistical analysis through different periods of Songliao Basin,Southeast Uplift Lishu fault depression,it studies the direction and length of fault here.The result shows that the Lishu fault depression experienced a NW-SE extension in Huoshiling stage,left-lateral extrusion in Shahezi stage and maximum regional stress field in Yingcheng stage.Lishu fault depression in the special structure of the site,which reflect and document the northeast Asia tectonic domain structure system and earth dynamics environment of innovation,transformation and evolution process and its main stages since Mesozoic.