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大庆长垣薄互储层预测是制约增储上产的主要瓶颈,主要面临单层薄、物性差、油藏规律不清、有效储层预测精度低等难题。围绕地震保幅处理、提高分辨率和有效的叠前预测几个方面展开研究,取得了一系列技术成果。在保幅处理方面,探讨出炮检域两步法反褶积、各向异性叠前时间偏移、道集规则化处理等配套技术。在提高分辨率方面,通过去T2屏蔽、道集提高分辨率、中远道子波拉伸校正、有效炮检距优选等手段,有效拓展频带,压制薄互层干涉作用。在叠前储层预测方面,通过AVO定性描述储层、孔隙度定量预测、叠前弹性反演等技术,描述出有效储层,在萨尔图地区,有效储层预测吻合率达78.5%以上。
The prediction of thin interbedded reservoirs in Daqing Changyuan is the main bottleneck that restricts the increase of reserves and production, which is mainly confronted with the problems of thin single layer, poor physical properties, unclear reservoir rules and low prediction accuracy of effective reservoirs. Focusing on seismic amplitude preservation, improving resolution and effective prestack prediction, a series of technical achievements have been made. In the aspect of amplitude preservation processing, this paper explores the complementary technologies of two-step deconvolution, anisotropic prestack time migration, gathers regularization and so on. In terms of improving the resolution, we can effectively expand the frequency band and suppress the interference of the thin interlacing by means of removing T2 shielding, increasing the resolution of the gathers, stretching correction of the Zhongyuan Daozao wave and selecting the effective offset. In prestack reservoir prediction, effective reservoirs are described by AVO qualitative description of reservoir, quantitative prediction of porosity and prestack elastic inversion. In the Saertu area, the predicted coincidence rate of effective reservoirs is above 78.5% .