南天山山前复杂褶皱的构造形态分析:以库车秋里塔克背斜和柯坪八盘水磨背斜为例

Geometry and Kinematics of Complex Folds, Illustrated with Examples from Quilitake Anticline of Kuqa and Bapanshuimo Anticline of Keping, Southern Tianshan

南天山山前发育叠瓦状断层和叠加褶皱,这类褶皱构造形态复杂,研究难度大。应用断层相关褶皱理论,依据地表倾角产状、二维地震剖面和钻测井数据,建立了南天山山前库车秋里塔克背斜和柯坪八盘水磨背斜的构造模型。该研究思路和手段对中国西部山前带复杂褶皱的研究有借鉴作用。

The foreland fold-and-thrust belts develop much more complex imbricate structures that continue to offer substantial and rich challenges. Quilitake anticline in Kuqa thrust belt and Bapanshuime anticline in Keping thrust belt along the piedmonts of the southern Tianshan are such complex imbricate folds. In order to determine the geometry and kinematics of these two folds, we present the models of the folds that are constructed using dipping and strike data of surface strata, 2-D seismic reflection profiles, and well drilling ＆ logging data. The concepts and methods of fault-related folding are used in our research which are helpful to understand the imbricate thrusts and folds in quantitative details.