朱正平,周自强,潘仁芳,罗文军,翁雪波
ZHU Zhengping,ZHOU Ziqiang,PAN Renfang,LUO Wenjun,WENG Xuebo

• 1:长江大学地球科学学院
• 2:中国石油西南油气田公司勘探开发研究院

摘要(Abstract)：

四川盆地高石梯-磨溪区块震旦系灯影组灯四段因储层埋藏深、厚度薄及硅质层的发育，导致常规反演方法精度低，多解性强。因此提出了一种基于相控地质统计学的去硅质的反演方法：首先结合测井曲线及岩石物理分析来明确各岩性段波阻抗特征；其次将储层波阻抗替换为硅质+基质波阻抗来重构新的波阻抗趋势（Pimp＿Trend），并通过统计分析明确Pimp＿Trend与样本井硅质含量曲线的共性结构，构建硅质波阻抗初始模型；最后将此模型作为约束条件参与地质统计学反演，求出与反演背景波阻抗相耦合的储层波阻抗，达到“去硅质”储层预测的目的。结果表明：相控地质统计学反演方法成功剔除了硅质层对于储层预测的干扰，凸显出储层波阻抗特征，即通过低波阻抗表征储层；与常规反演相比，相控地质统计学反演方法降低了反演结果的多解性，提高了储层识别精度。研究成果为研究区油气资源的利用与开发提供有力的技术支撑。
The fourth member reservoir of Sinian Dengying Formation in Gaoshiti-Moxi block of Sichuan Basin has low accuracy and multi-solution by conventional inversion methods due to deep burial, small thickness and siliceous layers development. Therefore, a desilication inversion method based on phase-controlled geostatistics is proposed. Firstly, the wave impedance characteristics of different lithologic sections are determined by combining well logs and petrophysical analysis. Secondly, reservoir wave impedance is replaced by silicon+matrix wave impedance to reconstruct new impedance trend(Pimp＿Trend), and the common structure of Pimp＿Trend and silicon content curve of sample wells is clarified via statistical analysis, building the initial model of silicon wave impedance. Finally, the model is used as constraint in geostatistical inversion to obtain reservoir wave impedance coupled with inversion background, realizing the purpose of “desiliconized” reservoir prediction. The results show that phase-controlled geostatistics inversion method successfully removes the interference of siliceous layers to reservoir prediction, and highlights reservoir wave impedance characteristics, i.e, characterizing reservoirs via low wave impedance. Compared with conventional inversion, this method reduces multi-solution of inversion results and improves reservoir identification accuracy. The research provides technical support for utilization and development of oil and gas resources in studied area.

关键词(KeyWords)： 相控约束;硅质层;地质统计学反演;灯四段;储层预测
facies-controlled constraint;siliceous layer;geostatistics inversion;fourth member of Dengying Formation;reservoir prediction

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“致密储层地震属性解析预测技术研究”（2016ZX05047-002-003）

作者(Author): 朱正平,周自强,潘仁芳,罗文军,翁雪波
ZHU Zhengping,ZHOU Ziqiang,PAN Renfang,LUO Wenjun,WENG Xuebo

DOI: 10.19597/J.ISSN.1000-3754.202306005

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