摘要:
苏里格气田盒8段储层岩性结构复杂、砂体薄、孔隙度低,砂、泥岩波阻抗叠置严重,常规的确定性反演结果难以满足识别高孔单砂体的需求.针对这一现状,在详细分析储层敏感参数与反演关键参数基础上,开展了地质统计反演的应用研究.研究表明,地质统计反演方法能有效综合地质、测井与三维地震数据,极大地提高预测结果的纵、横向分辨率,有效地解决了盒8段砂泥岩薄互层的单砂体识别问题;根据纵波阻抗与孔隙度的统计关系能准确刻画了高孔隙度砂体的空间展布,应用效果非常明显.应用实践证明,地质统计反演是陆相致密碎屑岩性油气藏进行储层精细描述的有效方法,具有广阔的应用前景.
Abstract:
The result of conventional deterministic inversion cannot meet the need for identifying single sand body with high porosity because the lithological structure of the reservoir in 8th Member of Shihezi Formation in Sulige gas field of Ordos Basin is very complex,the sandstone is thin,the porosity is low and the impedance of sandstone and mudstone is severely overlapped.In consideration of this situation and on the basis of an analysis of sensitivity reservoir parameters and key inversion parameters,the authors conducted the study of geostatistics inversion.Research shows that geostatistics inversion technology can effectively integrate geological,logging and 3D seismic data and greatly improve both vertical and lateral resolutions,thus effectively solving the problem of identifying single sand in thin alternating beds of sandstone and mudstone in the 8th Member of Shihezi Formation.In addition,the spatial arrangement of high-porosity sand body can be described correctly based on the statistical relation of P-wave impedance with porosity.The application effect is very inspiring.The application results show that the geo-statistics inversion method is a valuable method for fine reservoir description in the continental tight clastic lithological oil-gas reservoir and hence has an expansive application prospect.
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