鄂尔多斯盆地华庆地区侏罗系富县组油藏主控因素研究

Controlling factors of the oil reservoirs from the Jurassic Fuxian Formation in the Huaqing region, Ordos Basin

关键词:  主控因素  油藏  富县  华庆地区  鄂尔多斯盆地

Key words:  controlling factor  oil reservoir  Fuxian  Huaqing region  Ordos Basin

摘要:

侏罗系是鄂尔多斯盆地石油勘探与开发的重要目的层。华庆地区富县组油藏是近年鄂尔多斯盆地侏罗系勘探取得重大突破的新区块和新层系,已展现出良好的勘探前景和资源潜力。本文利用印模法等方法精细刻画了华庆地区前侏罗纪古地貌特征,深入分析了侏罗系富县组油藏控制因素和富集规律。结果表明,华庆地区侏罗系富县组油藏主要来源于下部三叠系延长组优质烃源岩,油藏类型为构造油藏和岩性-构造油藏,发育在古地貌斜坡带背景之上的河道边滩沉积主砂带内。油藏富集主要受控于前侏罗纪古地貌特征,充足的油源供给、河道边滩相沉积、优越的输导条件、鼻隆构造及良好的泥岩封堵等是华庆地区富县组油藏富集的主要控制因素。

Abstract:

In the petroleum exploration and development of the Ordos Basin, the Jurassic strata are interpreted as the major target strata, in which the oil reservoirs from the Jurassic Fuxian Formation in the Huaqing region are delineated as more promising areas for petroleum exploration. The present paper gives a detailed description of the pre-Jurassic palaeogeomorphological features and the enrichment and controlling factors of the oil reservoirs from the Jurassic Fuxian Formation. The oil reservoirs in the Fuxian Formation are believed to be derived from the excellent source rocks in the underlying Triassic Yanchang Formation, and consist of the structural-and lithological-structural oil pools developed in the point bar deposits on the slope zones and controlled by the pre-Jurassic palaeogeomorphological features. The factors favourable for the enrichment of oil reservoirs include sufficient hydrocarbon supply, point bar deposits, migration conduits, nose structures and cap rocks.