库车坳陷克拉苏构造带构造特征及天然气勘探

库车坳陷克拉苏构造带成藏地质条件优越,构造的发育与演化主要受区域逆冲断裂的控制,具有明显的南北分带、东西分段、纵向分层的构造特点。依据区域断裂、构造样式的不同,从北向南可划分为4个带,从西向东可划分为5个段。断裂控制构造的发育和差异性,而断裂特征受古构造背景、滑脱层及挤压应力强度的影响,造成成藏和保存条件的不同。克拉苏构造带优质储层发育、盐层相对较厚、远离断裂多期活动区,是理想的前景区,而大北、克深地区是天然气勘探的现实领域。

Structural features and natural gas exploration in the Kelasu structural belt,Kuqa Depression

The Kelasu structural belt of the Kuqa Depression has favorable geologic conditions for hydrocarbon accumulation. Its structural development and evolution are controlled by regional thrust faults. It is characterized by apparent zonation from south to north, segmentation from east to west and vertical layering. Four structural zones from south to north and five segments from west to east were identified according to different regional faults and structural styles. Faults controlled structure development and their differences, while three factors, namely palaeotectonic setting, detachment layer, and intensity of compressive stress, exerted influence upon the characteristics of the faults, forming different pooling and preserving conditions. The belt is an ideal prospective area for gas exploration because of its well-developed reservoirs, relatively thick salt beds, and location far away from multi-stage activating faults. Dabei and Keshen areas are more practical targets for gas exploration.