地址:四川省成都市高新区天府大道北段12号中国石油科技大厦

电话:028-86015441;028-86015319

邮箱:gaskk@petrochina.com.cn

QQ群:489323588

您所在位置:首页->过刊浏览->天勘2020.2


基于OVT 域数据各向异性处理的缝洞预测方法 ——以四川盆地云锦向斜茅口组为例
A method to predict fracture and vug based on OVT-domain data anisotropy processing: An example from Maokou Formation, Yunjin syncline, Sichuan Basin
龙 隆 陈 康 冉 崎 曾 鸣 彭 达 王跃祥
点击:268次 下载:33次
DOI:
作者单位:中国石油西南油气田公司勘探开发研究院
中文关键字:炮检距矢量片域 古岩溶 缝洞储层 各向异性 方位校正 成像测井
英文关键字:Offset vector tile (OVT) domain; Paleo-karst; Fractured-vuggy reservoir; Anisotropy; Azimuth correction; Imaging logging
中文摘要:    四川盆地中二叠统茅口组大型缝洞储层的预测方法已经比较成熟,但是针对小尺度岩溶缝洞型储层的地震预测难度大,预测准确率低。以云锦向斜为例,对比YJ1 井及YJ2 井,发现岩溶缝洞储层发育的地层具有强各向异性,其OVT 道集上茅口组地震反射随着方位角变化出现明显的“正弦波动”特征,采用基于三维曲面分解的各向异性校正技术对方位各向异性剩余时差进行校正,提取校正前后的地震数据差异,差异越大则缝洞越发育,采用“甜点”属性识别差异数据强振幅区为缝洞发育位置,三维透视刻画缝洞空间展布。研究结果表明:①纵向上,岩溶缝洞储层主要发育在茅口组顶向下30 ms 范围;平面上,缝洞储层集中发育在断层周边及古岩溶地貌陡坡单元。②岩溶缝洞储层发育的地层各向异性强, 在OVT 道集上表现出“正弦”波动特征明显,利用OVT 域各向异性信息结合三维可视化刻画缝洞系统更加清晰准确。③缝洞储层预测结果与向斜区4 口钻井实际情况均较吻合,对比常规处理数据缝洞储层预测结果准确性更高,在茅口组分布的四川盆地其他向斜区及其他小尺度缝洞储层发育层系具有推广价值。
英文摘要:    Most prediction methods used for large-scale fractured-vuggy reservoirs of Middle Permian Maokou Formation, Sichuan Basin, are relatively mature ones. But these methods for small-scale karst fractured-vuggy reservoirs are of high difficulty and low accuracy. So, taking both YJ1 and YJ2 wells in Yunjin syncline as examples, it was found that some stratum with developed karst fractured-vuggy reservoirs is of strong anisotropy, and the seismic reflection of Maokou Formation presents obvious characteristics of "sinusoidal fluctuation" in offset vector tile (OVT) gathering as azimuthal angle changes. Then, residual moveout of azimuthal anisotropy was corrected by using an anisotropic correction technology based on three-dimensional surface decomposition, and a little seismic-data difference before and after the correction was extracted. The larger the difference is, the ore developed the fractures and vugs are. Finally, based on "sweet spot" attributes, an area with strong amplitude of difference data was defined as one with developed
fractures and vugs, and spatial distribution of fractures and vugs was depicted by virtue of three-dimensional perspective. Results show that (1) the karst fractured-vuggy reservoirs are developed not only in vertical mainly 30 ms below the top Maokou Formation but also in horizontal mainly around faults and some in palaeogeomorphic units of paleo-karst steep slope; (2) the stratum with developed karst fractured-vuggy reservoirs is of strong anisotropy and presents obvious characteristics of "sinusoidal" fluctuation in its OVT
gathering. Its fractured-vuggy system can be depicted more clearly and accurately by combining OVT-domain anisotropy information with three-dimensional perspective; and (3) for these fractured-vuggy reservoirs, the prediction results are in line with real ones from four wells similarly in this syncline area, and are more accurate than those obtained from conventional processing data. All research results are worth popularizing in other syncline areas of Sichuan Basin developed with Maokou Formation and other small-scale fractured-
vuggy reservoirs.
读者评论

      读者ID: 密码:   
我要评论:
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
版权所有©2020天然气勘探与开发》编辑部 蜀ICP备10004100号
本系统由北京菲斯特诺科技有限公司设计开发
您是本站第2973385名访问者