测井方位遮挡下的反距离加权建模方法  

Inverse-distance weighted modeling method under logging azimuth occlusion

作　　者：王振涛[1] WANG Zhen-Tao(Geophysical Research Institute of SINOPEC Shengli Oilfield Branch Company,Dongying 257022,China)

机构地区：[1]胜利油田分公司物探研究院,山东东营257022

出　　处：《物探与化探》2023年第3期810-815,共6页Geophysical and Geochemical Exploration

基　　金：中国石化科技攻关项目“基于粘弹介质地震流体识别新技术研究”(P21046)。

摘　　要：现有测井建模方法未考虑地质沉积方向性,建模精度低,为了解决这一问题,通过对测井反距离加权建模方法优缺点分析,提出了一种测井方位遮挡下的反距离加权建模方法。该方法采用方位遮挡反距离加权插值公式,在考虑已知信息点与插值点的距离影响因素的同时,还考虑了已知信息点间的方位遮挡因素,通过综合非方位遮挡权系数来定量描述已知样本间方位遮挡影响。数值试验和实际资料对该方法和传统方法的对比结果表明,该方法建模结果空间变化更加平缓和自然,符合地质沉积变化规律。测井方位遮挡下的反距离加权建模方法,体现了地质沉积空间连续性和方位性的特点,在提高测井地质建模精度方面优势明显,具有很好的实际应用价值。Existing log modeling methods fail to consider the directionality of geological deposition,yielding low modeling precision.To overcome this obstacle,this study proposed an inverse-distance weighted(IDW)modeling method under logging azimuth occlusion by analyzing the advantages and disadvantages of the IDW log modeling method.The new method proposed in this study adopted the IDW interpolation formula under azimuth occlusion.In addition to the influencing factors of the distance between known information points and interpolation points,the new method also considered the azimuth occlusion between known information points.Moreover,this study quantitatively described the influence of azimuth occlusion between known samples by integrating the weighting coefficients of non-azimuth occlusion.As indicated by the comparison between the new method and conventional methods based on numerical experiments and actual data,the modeling results of the new method showed gentler and more natural spatial variation,which conformed to the variation patterns of geological deposition.In sum,the method proposed in this study reflects the spatial continuity and directionality of geological deposition,has distinct advantages in improving the precision of geological log modeling,and thus can be widely applied to practical applications.

关 键 词：测井建模 方位遮挡 反距离权系数 非方位遮挡权系数 

分 类 号：P631.4[天文地球—地质矿产勘探]