准噶尔盆地腹部地层水化学特征与油气成藏关系

Relationship Between Chemical Characteristic of Formation Water and Hydrocarbon Accumulation in Hinterland of Junggar Basin

油气的生成、运移、聚集、保存和散失都是在地层水的环境里或是在地层水的参与下进行的。地层水运动是油气运移聚散的动力和载体,其化学成分直接或间接地反映出油气赋存的环境与条件。地层水与油气在地质历史进程中的活动是相互依存、制约的因果关系。从水文地质观点和角度研究油气水的演化,剖析水和油相互作用的关系,掌握地层水对油气藏形成和分布的作用,同时利用地层水的某些离子特征和特征系数来反映油气的保存条件、地层的封闭程度、油气的运移有着密切的关系,旨在利用水化学的变化特征来寻找有利的油气聚集带。研究不同地区不同层系的油田水文地质,是寻找油气藏的方法之一,同时也是进行含油气远景评价的必备基础。

Generation, migration, accumulation, preservation and dispersion of hydrocarbon are always associated with or accompanied by formation water. The moving formation water acts as the driving force and the carrier for oil-gas migration, accumulation and dispersion, and its chemical compositions can directly or indirectly reflect the environments and conditions of hydrocarbon occurrence. The movements of formation water and hydrocarbon are of interdependent and inter-restricted relationship. This paper studies the evolution of oil, gas and water in hinterland of Junggar basin from point of view of hydrogeology, analyzes the mutual action among them and the effect of formation water on the formation and distribution of oil-gas reservoirs, including applying some ions and characteristic factors of formation water to reflect the closed relations among the preservation conditions of the oil and gas, the closing degree of reservoirs and the oil-gas migration for the purpose of searching for favorable oil-gas accumulation zones by the varied features of formation water. It is suggested that study of hydrogeology of field water from different areas and different horizons is also a method for exploring oil-gas reservoirs, which can provide essential basis for the oil and/or gas prospect evaluation in this basin.