准噶尔盆地玛湖—盆1井西复合含油气系统侏罗系地下水动力场的形成与演化

油气运移、聚集与地下水动力场的形成和演化密切相关,随着盆地的形成与演化,地下水动力场也有形成、发展和消亡的过程。准噶尔盆地玛湖—盆1井西复合含油气系统侏罗系现今地下水动力场具有不对称性:西北缘和陆梁隆起以北地区发育向心流,凹陷内地下水动力表现为滞流,仅在莫索湾凸起及其以南地区发育弱离心流。研究区侏罗系地下水化学分布表明在盆1井西地区曾发育离心流,结合盆地沉积演化分析,研究区侏罗系地下水出现滞流的时间应该在古近纪。

FORMATION AND EVOLUTION OF HYDRODYNAMIC FIELD IN THE JURASSIC OF MAHU-WEST OF WELL PEN1 MULTI-SOURCE PETROLIFEROUS SYSTEMS, JUNGGAR BASIN

The formation and evo1ution of hydrodynamic field play an important ro1e in the migration and accumulation of oil and gas. With formation and evo1ution of the sedimentary basin,the hydrodynamics also has its process of formation,development and final consumption. In the Junggar Basin, it might be asymmetry for the hydrodynamic field in the Jurassic system of Mahu-West of Well Pen 1 multi-source petrolifeous systems:gravity-induced centripetal flow in the NW margin and to the north of the Luliang Rise, stagnation in the inner areas of the depression, feeble centrifugal flow caused by mudstone compaction only in the Mosuowan Protrusion and the area to the south of the Mosuowan. Distribution of the Jurassic underground hydrochemistry indicated that there were ever centrifugal flows in the area of West of Well Pen 1, and the time might be Paleogene from centrifugal flow to stagnation by studying the sedimentary evolution of the basin. Because of hydrodynamic different distribution between the Permian and the Jurassic, oil and gas originated from the Permian could migrate and accumulate in all of hydrodynamic units of the Jurassic.