庙西-新北地区泉头组四段低渗透油层油水分布规律研究

基于庙西-新北地区的古构造演化、油气来源、成藏期次、成藏要素耦合及典型油气藏解剖的分析,研究庙西-西北地区泉头组四段低渗透油层组油水分布规律。结果表明:1青山口组一段烃源岩是研究区扶余油层最主要的油气来源,研究区油气来自北部以及西部青一段烃源岩;2新立-庙西-新北三者共为一个鼻状构造,其中包含一个鼻状构造高点和三个次级鼻状构造,为继承性古隆起所致,同时也是源岩大量生排烃期之前形成的,后期未发生强烈构造运动,保存完好,是油气的优势富集区;3通过典型油藏精细解剖,识别出嫩2井区的油藏在垂向上主要分布于5和12小层;在平面上以河道边界、封闭断层和底部油水界面为界圈定油藏展布范围。本文所提出的油水分布规律研究方法将会在油田下一步的勘探部署工作中发挥重要的指导作用。

The research of oil and water distribution rules in Miaoxi-Xinbei

The study of the oil-water distribution of K1q4 low permeability reservoir in Miaoxi-Xinbei area is based on the analysis of ancient tectonic evolution,hydrocarbon source, reservoir forming period, coupling of the accumulation elements and the dissection of typical reservoir. Results show that:(1)K1qn1 is the main source of Fuyu formation in research area, the oil of come from northern and western K1qn1 resource.(2)There is a nose structure in the research area, it contains a high structure and three secondary nose-like structure. These are formed by inherited palaeohigh, and formed before the phase of hydrocarbon expulsion. These structures are not suffered strongly tectonic movement in late, so they saved in good condition and can mostly be the advantage enrichment area of oil and gas.(3)Through the elaborate anatomy of reservoir,we successfully confirmed the oil deposit in wellblock Nen-2 is mainly distributed in 5 and 12 layers in vertically; On the plane, the distribution range of reservoir determined by the boundary of river, closed fault and the bottom oil-water interface. The summarized research method of the oil- water distribution rules will has great significance and function for the further exploration and deployment of oil field.