RESERVOIR GEOLOGICAL AND DEVELOPMENT CHARACTERISTICS OF TIGHT AND SUPERTIGHT MARGINAL OIL FIELDS——A CASE STUDY OF CONTINENTAL OIL FIELDS IN THE MESOZOIC BASINS OF NORTH LIAONING PROVINCE
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摘要: 边际油田是陆相地层中常见的一种油田类型,因油田储量小、油藏能量低、储层质量差等不利因素,使得开发这类油田遇到许多困难。近年来发现辽北及内蒙中生代盆地(上侏罗统)存在众多陆相低渗、特低渗边际油田,马家铺、廖1块和白3-白4块3个低渗、特低渗油田就是典型代表。本文重点讨论此类边际油田的储层特征,分析储层低渗的原因,并总结低渗油田的油藏动力学特征,在此基础上指出了合理开发边际油田的对策。Abstract: The marginal oil field is a common type of oil fields in continental strata.As there are small reserves,low accumulation energy and poor reservoir quality in oil fields,many defficulties emerge when developing this kind of oil fields.Recent years,a lot of continental tight and supertight marginal oil fields were discovered in the Mesozoic (Upper Jurassic) basins of North Liaoning and Nei Monggol,among which Majiapu,Liao-1 district and Bai 3-4 district are three typical tight and supertight oil fields.In this paper,the reservoir characteristics of this kind of marginal oil fields are emphatically discussed,the reason why reservoirs have low permeability is analyzed,and the reservoir dynamic characteristics of tight oil fields are summarized.On this basis,strategies for reasonable development of marginal oil fields are suggested.
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