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基于高分辨率的三维地震数据体,结合数字高程模型、野外地质露头信息、钻井数据和前人研究成果,选取若干阿瓦特地区的典型剖面进行精细构造解析,参照邻区地震剖面,梳理出研究区的区带结构特征。分析认为,阿瓦特地区长距离逆掩推覆构造的成因,主要有以下3点:1动力来源:受印藏碰撞远程效应的影响,中生代以来的造山运动,使该地受到强烈挤压,发育大规模的冲断褶皱变形,在阿瓦特段构造缩短率达到52%,为阿瓦特地区长距离逆掩推覆构造的形成提供了动力来源。2变形空间:阿瓦3井的钻探结果表明,阿瓦特地区的古近系膏盐层厚度达到1 855m,临近的博孜井区同期沉积的膏盐层平均厚度仅为236m,研究认为阿瓦特地区为古盐湖的一个沉积中心,岩性以石膏、膏质盐岩、盐岩和盐质泥岩为主,膏盐纯度高,可塑性与流变能力强,为阿瓦特地区长距离逆掩推覆构造的形成提供了充足的变形空间。3逆掩条件:阿瓦特地处侏罗系煤系地层的沉积边缘,煤层较薄,内摩擦系数较大,滑脱效率底下,在向南持续楔入的过程中,上、下滑脱层的内摩擦力差导致早期叠瓦状冲断构造向前发育受阻,5号断裂以古近系膏盐为支撑向上突破,断距自东向西逐渐加大,最终,在阿瓦3井区附近以长距离的垂向叠置构造变形,部分取代了向前陆方向传递的叠瓦状构造变形。巨厚的膏盐层为阿瓦特地区的油气成藏提供了优异的垂向和侧向封盖性能。
Based on the high-resolution 3D seismic data body, combined with digital elevation model, field geologic outcrop information, drilling data and previous research results, the typical sections of several Awat regions were selected for fine structure analysis. Zoning characteristics of the zone. The analysis shows that there are three main causes of the long-range overthrust nappe structure in the Awat region: 1 Power source: Influenced by the remote impact of the Tibet-Tibet collision and the orogeny since the Mesozoic, the area was strongly crushed and developed Large-scale thrust folding deformation, shortening rate of 52% in the Awat section, provides a driving force for the formation of the long-range thrust-cover nappe structure in the Awat region. 2 Deformation space: Drilling results of well No 3 3 show that the thickness of Paleogene gypsum salt in the Awat region reaches 1 855m, and the average thickness of gypsum salt deposit in the adjacent Beizi well area is only 236m. The study shows that the Awat The area is a sedimentary center of the ancient Salt Lake. The lithology is dominated by gypsum, gypsum salt rock, salt rock and salt mudstone. The gypsum salt has high purity, strong plasticity and rheological ability and is a long-range thrust shield in the Awat region The formation of the structure provides sufficient deformation space. 3 Reverse cover conditions: Awat is located in the sedimentary edge of the Jurassic coal measures strata, the thin coal seam, the larger the coefficient of internal friction, under the glide efficiency, in the process of continued wedge south, up and down within the delamination Frictional difference resulted in the early development of the shoal shoal thrusting blocked. On the 5th fault, it broke upwards by the Paleogene gypsum salt, and the fault distance gradually increased from east to west. Finally, near the well 3 Vertical long-distance structural superposition of deformation, in part, replaced the direction of the forward land-shoal-like structural deformation. Thick gypsum salts provide excellent vertical and lateral capping performance for hydrocarbon accumulation in the Awat area.