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基于低频重构的强非均质性火山岩储层预测 ——以简阳地区二叠系火山岩储层为例
Predicting strongly heterogeneous volcanic reservoirs based on low-frequency reconstruction: An example from Permian volcanic reservoirs, Jianyang area, Sichuan Basin
何青林1 陈 康1 冉 崎1 夏 青1 张 旋1 彭 浩2 邹定永1
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作者单位:1. 中国石油西南油气田公司勘探开发研究院 2. 中国石油西南油气田公司开发事业部
中文关键字:四川盆地 二叠纪 火山岩 频谱分解 非均质性储层 储层预测
英文关键字:Sichuan Basin; Permian; Volcanic rock; Frequency-spectrum decomposition; Heterogeneous reservoir; Reservoir prediction
中文摘要:    简阳地区二叠系火山岩中发育的火山碎屑岩、碎屑熔岩厚度大、孔隙度高,是一套具有较大勘探潜力的优质储层。但实钻井和地震资料表明,该套储层纵向上呈多旋回发育,横向上变化快,非均质性强,常规地震资料表现为无规律性的杂乱反射,难以通过资料解释直接刻画及预测该套储层的展布特征。基于该套火山岩储层厚度大、与非储层物性差异大的特点,利用地震信号的频谱分解技术提取火山岩宽频地震数据中的低频信号,通过对强波阻抗界面变化敏感的低频信号进行提取和重构,得到能直接反映储层响应的低频重构数据。研究结果表明:①研究区二叠系火山岩储层表现为强振幅能量的“亮点”反射特征,且该“亮点”反射振幅能量与储层厚度、孔隙度存在正相关关系,横向上可清楚识别和追踪;②基于频谱分解技术,选择地震数据中能够反映火山岩储层响应的低频信息进行重构,能够在重构数据上较准确的刻画厚层、强非均质性火山岩储层的分布;③通过上述技术开展简阳地区火山岩储层定性预测,刻画火山岩优质储层发育区400 km2,2 口井钻探结果均证实预测结果的可靠性。
英文摘要:    Both volcaniclastic rocks and clastic lavas developed in Permian volcanic rocks, Jianyang area, Sichuan Basin, are featured by large thickness and high porosity, and they are a set of quality reservoirs with greater exploration potential. Drilling practices and seismic data show that these reservoirs are vertically developed in the form of multiple cycles and laterally change fast with strong heterogeneity, and their conventional seismic data presents irregular chaotic reflection, so many distribution characteristics can be hardly depicted and predicted directly based on data interpretation. In view that the volcanic reservoirs are thick and greatly different from non-reservoirs in physical properties, this study adopted a frequency-spectrum decomposition technology of seismic signals to extract low-frequency signals from broadband seismic data of volcanic rocks. Then, low-frequency reconstruction data to reflect reservoir response was obtained by extracting and reconstructing these low-frequency signals that are sensitive to the change of strong
wave impedance interface. Results show that (1) the Permian volcanic reservoirs in this study area present "bright spot" reflection characteristics of strong amplitude energy, and this reflection is positively correlated with reservoir thickness and porosity and can be definitely identified and traced laterally; (2) after low-frequency signals that can reflect volcanic reservoir respone are selected from seismic data by virtue of the frequency-spectrum decomposition technology for reconstruction, the distribution of thick and strongly
heterogeneous volcanic reservoirs can be described more accurately; and (3) by applying above-mentioned technologies to qualitatively predict the volcanic reservoirs in Jianyang area, a zone of 400 km2 developed with high-quality volcanic reservoirs is depicted. In addition, drilling results from two wells may verify that this prediction result is reliable.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
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