
科学技术与工程

中国技术经济学会
考虑反演体振幅属性的窄小河道砂体刻画方法及应用: 以松辽盆地三肇凹陷南部葡萄花油层为例
代征华 , 边步荣 , 刘晓文 , 李庆 , 崔云华 , 刘宗堡
科学技术与工程 ›› 2026, Vol. 26 ›› Issue (26) :11287-11296
考虑反演体振幅属性的窄小河道砂体刻画方法及应用: 以松辽盆地三肇凹陷南部葡萄花油层为例
Method for Characterizing Narrow Channel Sand Bodies Considering Inversion Amplitude Attributes and Its Application: Putaohua Oil Layer in the Southern Sanzhao Sag, Songliao Basin
窄小河道砂体是河流-三角洲沉积储层中剩余油挖潜的重要目标,具有“窄、薄、差”的特点。常用的预测手段中,地震属性预测方法受限于地震资料品质,识别精度有限;储层反演方法一般用于预测砂体厚度,缺少对河道类型砂体的针对性识别。提出了“厚度-振幅”双参数定量识别方法:基于窄小河道砂体相对同一沉积环境内其他砂体具有厚度相对较大、敏感曲线幅度值相对较高的特征,在反演预测砂体厚度的基础上,进一步提取反演体振幅属性,构建“厚度-振幅”双参数识别标准,将砂体类型划分为河道砂体、疑似河道砂体和非河道砂体3种类型,结合地质规律实现窄小河道刻画。以松辽盆地三肇凹陷某区块的葡萄花油层为实例,该区水下分流河道砂体厚度一般在2~3 m,地震资料主频45 Hz,利用地震属性无法对河道进行识别。而采用本文方法可以识别厚度大于1.5 m的窄小河道,利用后验井进行验证,预测符合率达到85.2%。该方法实现了针对窄小河道砂体的“双参数定量”识别,不仅显著改善了窄小河道砂体的预测效果,更能为油田开发后期剩余油挖潜提供高精度的储层空间分布依据,直接指导井网调整、补孔选层等开发工程决策,对提高油气采收率、延长油田经济寿命具有重要现实意义,具有广泛的应用前景。
Narrow and small channel sand bodies, characterized by their “narrow, thin, and poor” properties, are considered important targets for tapping remaining oil in fluvial-deltaic sedimentary reservoirs. Conventional prediction methods exhibit limitations: seismic attribute analysis is restricted by seismic data quality, resulting in limited identification accuracy, while reservoir inversion is generally employed to predict sand thickness and lacks specificity for identifying channel-type sand bodies. A dual-parameter “thickness-amplitude” quantitative identification method was innovatively proposed. Based on the characteristics that narrow channel sand bodies possess relatively greater thickness and higher amplitude responses on sensitive logs compared to other sand bodies within the same depositional environment, an innovative dualparameter “thickness-amplitude” identification criterion was established. On the basis of sand-thickness prediction via inversion, the amplitude attribute of the inversion volume was further extracted. Sand bodies were classified into three types: channel sand bodies, suspected channel sand bodies, and non-channel sand bodies, and narrow channels were delineated by integrating geological patterns. The core innovation lies in transforming the “morphology-amplitude” recognition pattern of well logs into the “thickness-amplitude” quantitative parameters of the inversion volume, achieving a leap from qualitative description to quantitative characterization. The method is applied to the Putaohua oil layer in a block of the Sanzhao Sag, Songliao Basin, where underwater distributary channel sands are generally 2~3 m thick and seismic data have a dominant frequency of 45 Hz, under which conditions seismic attributes fail to identify channels. Using this method, narrow channels thicker than 1.5 m are successfully identified, and a prediction accuracy of 85.2% is achieved through validation with post-drilling wells. This approach realizes “dual-parameter quantitative” identification for narrow channel sand bodies. It not only significantly improves the prediction of such sand bodies, but also provides high-precision spatial distribution constraints for remaining oil targets during late-stage field development. It can directly guide development engineering decisions such as well-pattern adjustment and selective perforation, demonstrating important practical significance for enhancing hydrocarbon recovery and extending the economic life of oilfields, with broad application prospects.
窄小河道砂体 / 波形指示反演 / 砂体厚度 / 反演体振幅 / 松辽盆地三肇凹陷
narrow and small channel sand bodies / waveform indication inversion / sand body thickness / inversion amplitude / Sanzhao Sag, Songliao Basin
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国家自然科学基金(42102173)
国家自然科学基金(42172161)
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