甘肃及邻区中小盆地油气地质特征及资源潜力分析

依据甘肃及邻区各中小型盆地发育的构造背景、后期构造演化特征及其空间分布规律,将其划分为盆地群,分析了各盆地群的油气地质特征,分层系对各盆地(群)油气资源量、油气远景进行了估算与评价.结果表明,油气资源主要来自石炭系、侏罗系、白垩系3大层系,全区总资源量为46.64×10s t.研究认为,研究区围绕上述3套烃源岩系具有各自的重要勘探战场,相当一部分盆地具有良好的油气勘探前景.     

Tectonic Implications of Paleomagnetic Results From Upper Silurian Series Along the Hexi Corridor, Gansu, China

Characteristic directions of remanent magnetization of 38 samples from Upper Silurian Series (Hanxia Formation) along the Hexi Corridor passed fold test at a 99% confidence level. The corresponding paleopole is located at 45.1°N, 5.5°E (A_(95)= 4.7°, κ=25.1), close to the Late Permian pole for this area (41.4°N, 358.6°E; A_(95)= 4.3°, κ=26.6). However, there appears an obvious difference between paleolatitudes for these two stages (6°±). Based on paleomagnetic data, it can be deduced that the Hexi Corridor had probably been the western extension of the North China Block by the time of Late Silurian and kept being tectonically mobile compared with the principal parts of the North China Block. In addition, paleomagnetic data reveal that the Hexi Corridor experienced a southward displacement of about 600 km during the Late Paleozoic Era.     

河西走廊上志留统古地磁结果的大地构造意义

河西走廊上志留统旱峡组38个样品的特征剩磁方向从99％的置信度通过了褶皱检验,相应的晚志留世古地磁极位于45.1°N,5.5°E(A_(95)=4.7°,κ=2. 51),接近于该区的晚二叠世磁极位置(41.4°N,358.6°E;A_(95)=4.3°,κ=26.6);但两个时期的古纬度差异比较明显(6°±)。据古地磁资料推断,河西走廊很可能在晚志留世就已成为华北地块的西延部分,但构造活动性较强。古地磁资料还揭示河西走廊在晚古生代曾经历过南向位移,南移距离约600km。     

新构造运动活跃的库车盆地含油气系统特征

新构造运动一方面对先存盆地和古生油气藏进行着破坏与改造,一方面促进烃源岩热演化、提供优质储层、改造盆地疏导运移系统,为晚期成藏提供条件.本文结合库车盆地的构造演化、构造样式,着重分析了新构造与油气系统的关系,进而论述了新构造运动控制下的库车盆地含油气系统特征.最后分析得出该区域三个油气勘探目标区拜城、阳霞凹陷南坡秋里塔格背斜带;库姆格列木-依奇克里克断层相关褶皱带;南部构造带.