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低孔低渗油藏具高含油饱和度现象的地质成因分析——以胜利油区东营凹陷油藏为例 被引量:5

Geologic Genesis of High Oil Saturation in Low Porosity and Low Permeability Reservoirs——By Taking the Reservoir in Dongying Depression in Shengli Oil Region for Example
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摘要 研究了胜利油区东营凹陷砂岩储层含油饱和度的影响因素,研究表明,影响含油饱和度的主要因素一是油气的成藏动力,二是储层的孔隙结构,三是油气成藏后上覆地层的继续沉积作用。上覆地层的压力不断加大使已充满油气的储层中的流体的构成发生了变化,继续沉积的过程,使储层中的水得以不断排出,而油气得以保留,这使得储层的孔隙度越来越小而含油饱和度越来越大,现今的低孔低渗储层在油气成藏时并非低孔低渗储层,低孔低渗储层的含油饱和度不但不偏低反而有可能偏高。 The influential factors of oil saturation of sandstone reservoirs in Dongying Depression of Shengli Oil Region were studied.The results indicate that the major factors influencing oil saturation include:①reservoir dynamics;②reservoir pore structures;③the deposition of overlying strata after reservoir formation.By the increase of overlying pressure,structural changes are induced in fluids in the reservoirs with full oil and gas,water in the reservoir can not be drained off continuously in continous deposition process,which oil and gas are preserved,therefore the reservoir porosity becomes smaller and smaller,and oil saturation becomes bigger and bigger.Thus at present the low porosity and low permeability reservoirs are not the reservoirs with low porosity and low permeability,their oil saturation is higher instead of lower.
作者 朱家俊
出处 《石油天然气学报》 CAS CSCD 北大核心 2008年第3期64-67,共4页 Journal of Oil and Gas Technology
基金 中国石油化工股份有限公司"十条龙"项目(P01013)
关键词 东营凹陷 孔隙度 渗透率 含油饱和度 成藏动力 孔隙结构 压实作用 Dongying Depression porosity permeability oil saturation reservoir forming dynamics pore structure compaction
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