基于成像测井和常规测井多信息融合的致密油砂地比测井解释

Logging interpretation of tight oil sand ground ratio based on multi information fusion of imaging logging and conventional logging

鄂尔多斯盆地陇东地区延长组长8段致密油资源潜力巨大,为了获取致密油层系广泛发育的薄互层的砂地比准确计算值,对长8段的复杂岩性、薄层厚度以及含油性进行了特征分析,成像测井的高分辨率电阻率能更好地反映地层岩性的变化,有利于长8段复杂岩性的精细识别。通过对不同纵向分辨率内砂地比进行数值分析,建立了成像测井高分辨率电阻率砂地比计算模型,并利用电阻率各向异性,建立了利用感应测井和侧向测井等常规测井的砂地比计算模型,基于模型的应用结果分析,绘制了砂地比和电阻率的交会图。研究表明,成像测井砂地比计算模型和常规测井砂地比计算模型,能为研究区致密油开发、识别优质储层提供借鉴。

The tight oil resource potential of Chang 8 member of Yanchang Formation in Longdong area of Ordos basin is huge.In order to obtain the accurate calculation value of sand ground ratio of thin interbeds widely developed in tight oil series,the characteristics of complex lithology,thin layer thickness and oil bearing property of Chang 8 member were analyzed.The high-resolution resistivity of imaging logging could better reflect the changes of formation lithology,which was conducive to the fine identification of complex lithology of Chang 8 member.Through numerical analysis of sand to ground ratio in different vertical resolutions,a calculation model of high resolution resistivity sand to ground ratio of imaging logging was established.Using resistivity anisotropy,a calculation model of sand to ground ratio using conventional logging such as induction logging and laterolog was established.Based on the analysis of application results of the model,a cross plot of sand to ground ratio and resistivity was drawn.The research showed that the imaging logging sand to ground ratio calculation model and the conventional logging sand to ground ratio calculation model could provide reference for tight oil development and identification of high-quality reservoirs in the study area.