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陕甘宁盆地西缘掩冲构造带的马家滩段和铁克苏庙段为扭压型冲断,横山堡段为扭裂型冲断。这些冲断构造不同于常说的落基山、阿尔卑斯山的山前冲断推覆构造,而具有独特的冲断形式。本文通过对马家滩、铁克苏庙、横山堡各段的构造分析,阐明扭压型冲断及扭裂型冲断的构造特征。迄今已在扭压及扭裂冲断带内找到了多种类型的油气藏,表明这两种冲断带都是油气勘探的重要构造区。
Majiatan section and Tiekesu temple section in the western margin of the Shan-Gan-Ning basin are in torsional compression thrusting, and Hengshanbao section is in thrusting thrusting. These thrust structures are different from the commonly known Rocky Mountain, the alpine piedmont thrust nappe structure, and have a unique thrust form. Based on the tectonic analysis of Majiatan, Tekesu Temple and Hengshanbao sections, this paper clarifies the structural features of the torsional compression and torsional thrusts. To date, many types of reservoirs have been identified within the torsional and torsional thrust zones, indicating that both thrust belts are important tectonic zones for oil and gas exploration.