三塘湖盆地构造特征与有利勘探方向

STRUCTURAL CHARACTERISTICS AND FAVORABLE BELTFOR HYDROCARBON EXPLORATION IN SANTANGHU BASIN

三塘湖盆地位于新疆维吾尔自治区东北部 ,是由不同时期的残留盆地叠加并置而成的中型复合型含油气盆地。盆地构造演化经历了前陆盆地和陆内盆地两个大阶段 ,后者又进一步分为陆内裂谷时期、再生前陆盆地时期和盆地消亡时期。每个演化阶段末期几乎都伴有大规模的冲断推覆活动 ,造成盖层变形 ,形成大量圈闭。条湖凹陷—马朗凹陷南部 ,位于逆掩成油组合的有利部位 。

Santanghu Basin, located in the northeast Xinjiang, is a medium-sized composite hydrocarbon basin juxtaposing and superimposing relict basins formed in different stages. It has two tectonic evolutionary stages of foreland basin and intracontinental basin that is further divided into three periods of intracontinental rift, newborn foreland basin and dying out basin. The extensive thrusting movements happened at the end of every evolutionary stage, which lead to deformation of sedimentary layers and formation of many enclosures. The southern Tiaohu sag and the southern Malang sag, located in the favorable belt of overthrusting hydrocarbon generation system, are favorable areas for petroleum exploration.