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以准噶尔盆地为例,利用运移和聚集动力学方法对不同时期天然气运移和聚集方向进行了综合分析,表明侏罗系天然气在白垩纪-早第三纪的运移以及二叠系天然气在侏罗纪以来的运移受控于沉降过程所决定的流体压力(包括异常压力)和毛细管力,而保罗系天然气在晚第三纪至今的运移以及二叠系天然气在三叠纪的运移受控于构造应力,据此指出了准噶尔盆地天然气运移和聚集的有利地区.研究表明在构造稳定早期,流体压力、重力、毛细管力是影响流体势的3个主要动力机制;而在构造强烈活动时期,由于强烈构造挤压引起流体压力骤增对天然气运移的作用远远大于重力和毛细管力的作用,故构造应力起主导作用.
Taking Junggar Basin as an example, the migration and accumulation dynamics are used to analyze the gas migration and accumulation in different periods. It shows that the migration of Jurassic natural gas from Cretaceous to Early Tertiary and the increase of Permian natural gas The migration since the Jurassic was controlled by fluid pressure (including abnormal pressure) and capillary force determined by the sedimentation process. However, the migration of the Paulian natural gas from the late Tertiary to the present and the Permian natural gas transport over the Triassic Which is controlled by the tectonic stress and pointed out the favorable areas for the migration and accumulation of natural gas in the Junggar Basin.The results show that fluid pressure, gravity and capillary force are the three main dynamic mechanisms that affect fluid potential in the early stage of structural stability. However, During the intense activity period, the tectonic stress played a leading role because the effect of sudden increase of fluid pressure on the migration of gas was far greater than that of gravity and capillary force.