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大庆长垣的形成,大致经历了二大发展阶段。青山口组至嫩江组沉积时期,大庆长垣处于大型河流三角洲相与湖相过渡带,砂质沉积物发育。而其两侧的齐家一古龙凹陷和三肇凹陷此时期处于湖相环境,沉积物以泥质为主。在沉积差异压实作用下、大庆长垣地区形成“沉积构造”。这种“沉积构造”塑造了大庆长垣的雏型,是大庆长垣的早期发育阶段。嫩江组沉积以后的构造应力,使大庆长垣进一步发育成当今的构造形态,这是大庆长垣的晚期发育阶段。嫩江组沉积末期,按恢复的原始地层厚度计算表明,大庆长垣地区的青山口组生油层,已进入大量生油的门限深度和门限温度,油气大量生成并不断地向大庆长垣雏型构造运移和聚集。因此,大庆油田是典型自生自储为主的陆相三角洲大油田。
Daqing Changyuan formation, generally experienced two major stages of development. During the deposition from Qingshankou Formation to Nenjiang Formation, Daqing Changyuan is in the transition zone of facies and lacustrine facies of large river delta with sandy sediments developing. The Qijia-Gulong Sag and the Sanzhao Sag on both sides are in the lake environment at this period, and the sediments are mainly muddy. Under the action of differential sedimentation, the “sedimentary structure” formed in the Changyuan area of Daqing. This “sedimentary structure” shaped the embryonic form of Daqing Changyuan, an early stage of development of Daqing Changyuan. The tectonic stress after the Nenjiang Formation sedimentation further enabled Daqing Changyuan to further develop into the current tectonic setting, which is the late stage of development of Daqing Changyuan. At the end of the Nenjiang Formation sedimentation, according to the thickness of the recovered original formation, it shows that the Qingshankou Formation oil layer in the Changyuan area of Daqing has entered the threshold depth and threshold temperature for a large amount of oil generation. The oil and gas are massively generated and continuously distributed to Daqingyuanyuan prototype Transport and aggregation. Therefore, Daqing Oilfield is a typical continental self-storage and continental oilfield.