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若尔盖地区晚白垩世以来阶段性隆升幅度不少于3400m,晚白垩世和晚中新世至今阶段的快速隆升过程对本区流体应力场产生了重要的影响.综合野外详细地质、裂缝系统空间分布和流体包裹体地球化学等特征研究表明,若尔盖地区浅部地层以发育高角度(或近垂直)裂缝为主,深部地层以发育低角度(或近平行)裂缝为主;流体早期具有热流体增温特征,中、晚期具有淡水流体混合特征,多期流体混染形成开放性流体动力环境,阶段性快速抬升过程与流体活动的多期性特征具有一定对应性.基于阶段性隆升过程诱发的岩石应力-应变行为特征,讨论了本区多期隆升运动背景下,阶段性隆升释压与流体幕式流动的时空耦合机制及油气地质效应.
The regional uplift of the Zoige area since the Late Cretaceous is not less than 3400 m, and the rapid uplift from the Late Cretaceous and the late Miocene up to now has an important impact on the fluid stress field in this area. Comprehensive geologic and fracture system space Distribution and fluid inclusions geochemistry and other characteristics of the study shows that the shallow area of the Ruoergai area to the development of high-angle (or nearly vertical) fractures, deep strata to develop low-angle (or near parallel) fractures; early fluid with hot fluid The characteristics of temperature increase and the mixed characteristics of freshwater fluid in the middle and late stages, and the multiphase fluid contamination forms an open hydrodynamic environment, and the stage rapid uplift process has some correspondence with the multiphase characteristics of fluid activities.Based on the stage uplift process induced The characteristics of rock stress-strain behavior are discussed. The temporal and spatial coupling mechanism of stage uplift pressure release and fluid curtain flow in the background of multi-stage uplift movement and the geological effects of oil and gas are discussed.