Application of multi-attribute fusion in quantitative prediction of reservoirs: A case study of Yangshuiwu buried hill in Langgu sag
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摘要: 杨税务潜山位于廊固凹陷北部,裂缝孔隙型储层发育,地质综合研究表明该区处于油气运聚的有利方向,但由于其储层埋藏深,地震资料成像精度低,常规属性预测有效储层难度大,多解性强。本文在充分分析已钻井地球物理响应特征的基础上,优选了对有效储层响应敏感的3个属性——平均振幅、方差属性、弧长属性,并计算有效储层厚度与优选属性之间的相关系数,依据相关系数大小确定属性融合权重,最终得到反映有效储层厚度的融合属性,该融合属性有效降低了单属性预测的多解性,同时实现了有效储层的定量预测。实践证明,多属性融合技术有效实用,并在杨税务潜山地区取得了良好的应用效果。Abstract: The Yangshuiwu buried hill is located in the northern part of the Langgu sag,where fractured porous reservoirs are well developed.As indicated by comprehensive geological studies,it is in the direction favorable for hydrocarbon migration and accumulation.However,owing to the deep reservoirs and low imaging accuracy of seismic data,it is difficult to predict effective reservoirs using conventional attributes and the obtained prediction results feature strong multiplicity of solution.Based on full analyses of the geophysical response characteristics of existing drilled wells,this study selects three optimal attributes sensitive to the response of effective reservoirs,namely mean amplitude,variance,and arc length,and calculates the correlation coefficient between the thickness of effective reservoirs and each of the optimal attributes.Then it determines the fusion weight of each attribute according to corresponding correlation coefficient,and finally obtains the fused attribute than can reflect the thickness of effective reservoirs.The fused attribute can be used to effectively reduce the multiplicity of solution compared with single attribute prediction and quantitatively predict effective reservoirs.Practice has proved that the multi-attribute fusion technology is effective and practical and has achieved accurate application results in the Yangshuiwu buried hill.
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