东营凹陷北部陡坡带沙四下亚段砂砾岩储集层物性下限  

Lower Limits of Physical Properties of Glutenite Reservoir in Lower Section of the 4^(th) Member of Shahejie Formation in Steep Slope Zone of Northern Dongying Sag

作　　者：高阳 GAO Yang(Research Institute of Exploration and Development, Shengli Oilfiled Company, Sinopec, Dongying, Shandong 257015, China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《新疆石油地质》2017年第5期559-566,共8页Xinjiang Petroleum Geology

基　　金：中国石化科技攻关项目(P15085)

摘　　要：东营凹陷北部陡坡带沙河街组沙四下亚段砂砾岩储集层非均质性强,岩性复杂,埋深跨度大,油气相态复杂,钻井少,单层试油资料匮乏,有效储集层物性下限难以界定。利用试油法、岩心含油产状法、最小流动孔喉半径法和正逆累计法,对不同深度、不同流体的砂砾岩储集层的孔隙度和渗透率下限进行了研究。研究结果表明,埋深为3 000~4 000 m时发育油藏,孔隙度下限为6%,渗透率下限为1.0 mD;埋深为4 000~4 500 m时发育凝析气藏,孔隙度下限降低至4%,渗透率下限为0.2 mD;埋深大于4 500 m时发育天然气藏,孔隙度下限降低至3%,渗透率下限降低至0.1 mD;随着埋深增加,储集层中的流体性质发生变化,储集层孔隙结构和储集空间类型也发生变化,导致储集层物性下限逐渐降低。Glutenite reservoir in the lower section of the4th member of Shahejie formation in the northern steep slop zone of Dongying sag ischaracterized by strong heterogeneity,complex lithology,large variation of reservoir burial depth and complicated oil and gas phases.In addition,due to the lack of drilling and single-layer formation test data,it is difficult to determine the lower limits of physical properties of theeffective reservoir.Base on methods of formation test,oil-bearing occurrence in cores,minimum flow pore throat radius and positive&nega-tive cumulative method,the lower limits of porosity and permeability of the glutenite reservoir with different fluids and at different burialdepth are determined.The research results show that the lower limits of porosity and permeability for reservoirs at the burial depth of3000~4000m are6%and1.0mD,respectively;those for condensate reservoirs at the burial depth of4000~4500m are4%and0.2mD;and thosefor gas reservoirs with the burial depth larger than4500m are3%and0.1mD.With the increase of burial depth,the properties of reservoirfluids change,and pore structures and reservoir space types change,too,which results in the gradual decline of the lower limits of reservoirphysical properties.

关 键 词：东营凹陷 北部陡坡带 沙河街组 沙四下亚段 砂砾岩 有效储集层 物性下限 

分 类 号：TE112.23[石油与天然气工程—油气勘探]