鄂尔多斯盆地北部低孔、低渗含气储层综合反演与描述  

Integrative inversion and description of gas-bearing reservoir with low porosity and permeability in north Ordos basin.

作　　者：王鑫[1] 

机构地区：[1]中石化胜利油田有限公司勘探项目管理部

出　　处：《石油地球物理勘探》2006年第3期290-294,共5页Oil Geophysical Prospecting

摘　　要：鄂尔多斯盆地北部低孔、低渗含气储层具有以下特点:①构造对天然气聚集不起控制作用,岩性尖灭和储层内物性变化控制着天然气的聚集和成藏;②储层薄、煤层与储层伴生、储层识别标志不清;③含气砂岩与泥岩速度相近(含气砂岩与泥岩间的波阻抗差值小)。文中针对该区含气储层的特点,提出了地质统计波阻抗反演、岩性及孔隙率反演的综合反演技术,得出以下认识:①孔隙率是反映气层的敏感参数;②地质统计波阻抗反演可提高分辨率,是识别煤层和高速灰岩的有效手段;③岩性反演可识别砂岩,岩性约束下的砂岩孔隙率反演可从砂岩中识别气层。文中所述的综合反演技术在鄂尔多斯盆地北部低孔、低渗含气储层的描述中取得了良好的应用效果,提高了储层的预测精度。The gas-bearing reservoirs with low porosity and permeability in north Ordos basin have following characters: (1)the lithologic pinchout and physical variation in reservoirs control the accumulation and generation of reservoirs while the structures do not control the accumulation of natural gas; (2)thin reservoir accompanied with coal seam and unclearly identified marks of reservoir; (3)the velocity of gas-bearing sandstone approaches to that of mudstone (small wave impedance difference between gas-bearing sandstone and mudstone). In view of the characters of gas-bearing reservoirs, the paper presented geostatistic wave impedance inversion, joint inversion including lithology and porosity inversions and concluded following knowledge: (1) the porosity is sensitive parameter reflecting gas-bearing reservoir; (2)geostatistic wave impedance inversion can improve the resolution and is effective measure to identify the coal seam and limestone with high velocity; (3)the lithologic inversion can identify sandstone, lithology-constrained sandstone porosity inversion can identify the gas-bearing reservoir from sandstone. The application of integrative inversion technique presented in the paper achieved good effects in the description of gas-bearing reservoirs with low porosity and permeability in north Ordos basin and increased predicted precision of reservoirs.

关 键 词：气层 地质统计波阻抗反演 岩性反演 孔隙率反演 

分 类 号：P618.130.2[天文地球—矿床学] P618.13[天文地球—地质学]