东营凹陷南坡沙四段上亚段滩坝砂岩储层孔喉结构特征及有效性  

Controlling factors and influence on reservoir pore throat structure of beach-bar sands,upper part of Sha IV member,south slope of Dongying depression

作　　者：王健[1] 操应长[1] 刘惠民[2] 贾光华[2] 王天福[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266555 [2]中国石化股份胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2011年第4期21-24,34,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家重大油气专项"东营凹陷沙河街组碎屑岩储层纵向演化及其量化表征研究"(2008ZX05051-02);国家自然科学基金项目"东营凹陷古近系中深层孔隙度高值带成因机制及其量化预测研究"(40972080);教育部新世纪优秀人才支持计划(NCET-06-0604)

摘　　要：储层的孔喉结构控制了油气的运移和储集,对油气采收率有很大的影响。通过分析东营凹陷南坡沙四段上亚段滩坝砂岩的压汞曲线形态及特征参数,探讨了滩坝砂岩储层孔喉结构类型及其控制因素,分析了其对储层有效性的影响。滩坝砂岩压汞毛管压力曲线主要存在4种类型,分别对应高孔高渗透粗喉型、中高孔中高渗透中喉型、中低孔中低渗透中细喉型和低孔低渗透特细喉型孔喉结构。影响滩坝砂岩储层孔喉结构的因素主要有沉积微相、沉积物粒度和分选以及成岩作用,沉积物成分成熟度对其影响不明显。孔喉结构微观上控制了储层的物性下限和储层有效性。孔喉结构特征对储层有效渗透率下限的影响程度强于对储层有效孔隙度下限的影响程度,滩坝砂岩有效储层的孔喉结构类型主要是高孔高渗透粗喉型、中高孔中高渗透中喉型和少量的中低孔中低渗透中细喉型。有效储层比例由高孔高渗透粗喉型储层向低孔低渗透特细喉型储层明显降低。The pore throat structure of reservoir controls the migration and accumulation of hydrocarbon and influences the oil and gas recovery factor.Based on the analysis on morphology and characteristic parameters of intrusive mercury curves of beach-bar sand body of the upper part of Sha IV member in the south slope of Dongying depression,the types and controlling factors and the influence on reservoir effectiveness of pore throat structure of beach-bar reservoir are studied.There mainly exists four kinds intrusive mercury curves of beach-bar sands and representing respectively high porosity-high permeability-coarse throat pore throat structure,mid high porosity-mid high permeability-mid throat pore throat structure,mid low porosity-mid low permeability-mid fine throat pore throat structure and low porosity-low permeability-special fine throat pore throat structure.The factors affecting pore throat structure of beach-bar sands reservoir are mainly sedimentary microfacies,sediment grain size and separation and diagenesis, and the influence of sedimentary compositional maturity is not significant.The petrophysical parameter cutoff and reservoir effectiveness are controlled by pore throat structure microscopically,and the influence level on effective permeability cutoff is stronger than that of effective porosity cutoff.The types of pore throat structure of beach-bar sands reservoir are mainly high porosity -high permeability-coarse throat pore throat structure,mid high porosity-mid high permeability-mid throat pore throat structure and a small quantity of mid low porosity-mid low permeability-mid fine throat pore throat structure.The effectiveness reservoir is obviously decreased from high porosity-high permeability-coarse throat pore throat structure reservoir to low porosity-low permeability-special fine throat pore throat structure reservoir.

关 键 词：滩坝砂岩 孔喉结构 有效储层 沙河街组 东营凹陷 

分 类 号：TE112.23[石油与天然气工程—油气勘探]