准噶尔盆地南缘齐古背斜复杂构造建模技术应用

齐古背斜构造复杂,变形强烈,地震资料相对较差,构造样式建立存在多解性。为准确落实该区构造特征,从地质“戴帽”、倾角标定及平衡恢复与几何变形正演等关键技术出发,对齐古背斜进行精细构造解析,确立齐古背斜为早期构造三角楔与晚期冲断褶皱复合叠加的构造样式。该背斜主体部位具分层、分块构造特征,西段以南倾冲断断裂为主,东段以北倾反冲断裂为主。复杂构造建模技术的应用将有助于建立更为合理的构造解释方案,大大降低油气勘探风险。

Modeling Technology Application for Complex Qigu Anticline Formation on South Edge of Junggar Basin

Qigu anticline formation is complex, its seismic data is relatively poor, and there are multiple solutions for the formation. Proceeding from geological“Capping”, angle calibration, forward modeling for balance restoration and geometry deformation and other key technology for complex formation modeling, fine structure analysis is conducted for Qigu anticline, so as to confirm that Qigu anticline is the structural pattern complexly superimposed by the triangular wedge formed at early stage and the thrust faulted-fold at late stage. The major part of Qigu anticline formation is characterized by layering and blocking.The south-dipping thrust fault is dominant in the western,and the north-dipping recoil fault is dominant in the eastern.The modeling technology application of complex formation will be conducive to establish more reasonable formation interpretation scheme, so as to decrease of risk of oil-gas exploration significantly.