库车褶皱冲断带秋里塔格构造带东、西分段构造特征与油气聚集

近东西向的库车褶皱冲断带内发育近南北向的喀拉玉尔衮、康村和吐格尔明走滑断层,它们将库车褶皱冲断带尤其是作为前缘带的秋里塔格构造带分割成东秋里塔格、西秋里塔格和却勒塔格构造等段落;侧断坡在东、西构造分段上也起着重要作用.不同分段的构造特征存在较大的差异,其中东秋里塔格构造深部发育双重褶皱构造,浅部构造发育断展褶皱;西秋里塔格构造受近东西向走滑断层控制,发育南、北两排构造,剖面上表现为断展褶皱和滑脱褶皱特点;却勒塔格构造是典型的滑脱褶皱.就油气成藏而言,走滑断层是破坏油气聚集的主要因素之一;侧断坡相关背斜是库车坳陷油气勘探的新领域.

FEATURES OF STRUCTURAL SEGMENTATION AND ACCUMUNATION OF OIL AND GAS IN THE QIULITAGE STRUCTURAL BELT, KUQA FOLD-AND-THRUST BELT

There were three north-south strike-slip faults, namely, the Kalayuergun, Kangcun and Tugerming faults, in the W-E-stretching Kuqa fold-and-thrust belt. The recent study indicated that these faults segmented the Kuqa fold-and-thrust belt, especially the Qiulitage structural belts, into several parts, such as the Eastern Qiulitage, the Western Qiulitage and the Queletagh structural sectors. In addition, the lateral ramps played an important role in the structural segmentation, too. Many differences could be discovered among these structural sectors. The structural style of the Eastern Qiulitage sector was characterized by duplex in the deep and fault-propagation folding in the shallow, while the structure of the Western Qiulitage sector was controlled by the W-E strike-slip faulting, characterized in the transverse section by fault-propagation and gliding folds. The Queletagh structure was a typical gliding fold. As the reservoir being concerned, strike-slip faulting might be an important factor to destroy the accumunation of oil and gas, and the lateral ramp-related anticlines might be a new field for exploration in future.