摘要
东营凹陷北部陡坡带砂砾岩油藏表现出很强的有序性,通过对不同层系砂砾岩油藏的解剖,探讨了各类油藏的基本特征及其有序性展布的控制因素,建立了砂砾岩油藏序列模式。研究结果表明,砂砾岩油藏模式可概括为深层凝析气藏、深层扇根封堵岩性油藏、中深层构造-岩性油藏、中浅层物性差异封堵岩性油藏依次发育的油藏组合模式,在平面上呈环带状展布,由洼陷中心到盆地边缘依次发育深层气环带、深层稀油带、中深层稀油带和中浅层稠油环带。砂砾岩油藏的成藏控制因素各异,其中,深层凝析气藏和稀油岩性油藏成藏的首要因素是扇体上倾方向的扇根遮挡能力,中深层构造-岩性油藏的形成取决于是否存在有效的微幅背斜构造圈闭,而浅层物性差异封堵岩性油藏的形成取决于稠油不易流动的特性。根据各类型油藏的基本特征和油气富集规律,应设计不同的勘探部署方案。
There are several conglomerate reservoir types in the eastern north steep slope zone in Dongying depression, whose distribution has an ordered sequence. By the dissection of different conglomerate traps, the basic characteristics of these reservoirs and controlling factors of their ordered distribution are discussed. On the basis of reservoir characteristic and distribution law, the ordered reservoir combination pattern includes under-salt condensate gas reservoir, fan root lithologic reservoir, structural-lithological reservoir, and the digenesis trap reservoir that is sealed by difference of physical properties. The reservoir series, that are in order of under-salt gas play, deep zone thin oil play, medium-deep thin oil play, and shallow layer heavy oil play, are distributed ring- shaped around the subsidence centre of the basin. Every reservoir type had its particular hydrocarbon accumulation controlling factors. The main pool controlling factors of deep condensate gas and thin oil lithologic reservoir are the sealing capacity of fan root, the one for medium-deep structural-lithologic reservoir is development of small anticlinal traps, and the heavy oil is thick, which is the key controlling factors for shallow layer reservoir that is sealed by difference of physical properties. Different exploration plans are designed according to the reservoir characters and oil distribution law.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2012年第5期20-23,112,共4页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"渤海湾盆地东营凹陷勘探成熟区精细评价示范工程"(2008ZX05051)
关键词
砂砾岩
油藏类型
演化序列
控制
因素
东营凹陷
conglomerate
reservoir types
evolutionary series
controlling factor
Dongying sag
