基于部分叠加数据的叠前同时反演技术的应用

Application of pre-stack simultaneous inversion based on partial stack data

鄂尔多斯盆地苏里格西部地区气田的主力储层位于二叠系石盒子组盒8段,属于岩性油气藏,具有典型的砂泥岩薄互层特征,而且横向变化大、非均质性极强。含气砂岩的声波阻抗和泥岩的声波阻抗存在较大范围的重叠,难以区分。本文较详细地介绍了基于部分叠加数据的叠前同时反演技术的研究思路、可行性分析及其关键反演技术应用和质量控制措施。通过对苏里格西部地区实际资料的应用,验证了该反演技术对储层预测的有效性。

The main pay zone for the west Sulige gas field,Ordos Basin is in He-8 formation of Shihezi group in the Permian,it is a lithologic reservoir with typical characteristics of thin sand-shale interbed,large horizontal change and severe heterogeneity.The impedance of the gas-bearing sandstone and the impedance of the shale almost overlapped with each other,so the reservoir can be hardly resolved from the impedance results.In this paper the research method of the pre-stack simultaneous inversion technique,the feasibility study,the application of the key inversion technique and the QC measurements are introduced in detail.The successful application of field data in west Sulige area validated the effectiveness of the inversion technique for reservoir prediction in this area.