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柴达木盆地东部三湖地区第四纪湖相沉积面积达1× 1 0 4km2 以上 ,第四系厚度最大为 34 0 0m ,其中 ,下更新统涩北组中上段的泥岩夹粉砂岩段是该区的主力气源岩 ,也是原生构造型气藏发育层段。目前的勘探和研究成果表明 ,该区第四系局部构造属同沉积构造 ,其形成虽受深层第三纪古构造和古地形影响 ,但第四纪变形的边界控制条件不同。采用遥感解译手段 ,结合地震剖面研究 ,认为三湖地区第四系局部构造的形成受盆地北侧边界断裂的影响更大 ,变形动力主要来自盆地北缘 ,构造分布在一定程度上受盆地边界断裂、盆内主干断裂等控制 ,根据主干断裂的分布特征可推测局部构造的分布位置。
The Quaternary lacustrine sedimentary area in the Three Lakes of the eastern Qaidam Basin is above 1 × 104km2, and the Quaternary thickness is up to 3400m. Among them, the mudstone section of the middle and upper part of the Lower Pleistocene Seibu Formation is The main gas source rocks in this area are also the primary structural gas reservoir development intervals. The current exploration and research results show that the Quaternary local structure in this area is a syndepositional structure. Although its formation is affected by the deep third Tertiary and paleogeomorphology, the boundary conditions for the Quaternary deformation are different. By means of remote sensing interpretation and seismic profile analysis, it is concluded that the formation of the Quaternary system in the Sanhu area is more affected by the boundary faults on the northern side of the basin, and the deformation dynamics are mainly from the northern margin of the basin. The tectonic distribution is affected to a certain extent by the basin boundary Faults and main faults in the basin. According to the distribution characteristics of main faults, the distribution of local structures can be inferred.