伊拉克中部E油田三角洲前缘Zubair层系砂岩储层预测
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TE19

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中国博士后科学基金(2018M641420, 2019M650033, 2018M64142)


Sand Reservoir Prediction For The Delta Front Zubair Formation Of The E Oilfield In Central Iraq
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    摘要:

    伊拉克中部下白垩统Zubair层系砂岩储层为中东重要油气储层,为三角洲前缘沉积,储层横向变化快,明确砂体分布规律对于油藏开发具有重要意义。针对目的层段,统计工区内6口井的砂体厚度与油层厚度,综合应用叠后地震反演与地震多属性定量分析,优选对储层敏感的地震属性,进行归一化处理,获得综合地震属性用于指示有利储层分布。研究表明,研究区内平均波阻抗、最大波阻抗可以一定程度上反映砂岩有利分布区,但叠后反演波阻抗有利储层识别能力有限;最大振幅属性和均方根振幅属性随砂体厚度增大而增大,瞬时频率属性与平均主频属性随油层厚度增大而增大;上述地震属性与砂体发育、含油气性吻合度较高,可作为工区内的敏感地震属性,指示有利储层分布规律。

    Abstract:

    The Zubair formation of Lower Cretaceous in central Iraq is an important formation for hydrocarbons in Middle East. Sand changes quickly in the horizontal horizon in the Zubair formation, which was delta front subface. Understanding the horizontal distribution of the sands in the formation is essential for hydrocarbon development. Statistics of the sand thickness and oil thickness were extracted from the 6 wells within the study area. Post-stack seismic inversion and quantitative seismic attribute analysis were combined to indicate favorable hydrocarbon reservoirs. Sensitive attributes were normalized and used to generate an integrated attribute to indicate reservoir distribution. It turns out that average impedance and maximum impedance could indicate favorable sand area. But seismic inversion is not enough to discriminate sand and shale completely. The maximum amplitude and RMS amplitude increase with the sand thickness. The instantaneous frequency and average dominant frequency increase with the oil thickness. These attributes coincides well with the sand and hydrocarbon statistics of the 6 wells. They are suggested to be sensitive attributes and to be employed to indicate favorable reservoir distribution.

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徐 超,陈春强,邓继新,等. 伊拉克中部E油田三角洲前缘Zubair层系砂岩储层预测[J]. 科学技术与工程, 2020, 20(26): 10734-10739.
Xu Chao. Sand Reservoir Prediction For The Delta Front Zubair Formation Of The E Oilfield In Central Iraq[J]. Science Technology and Engineering,2020,20(26):10734-10739.

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历史
  • 收稿日期:2019-11-01
  • 最后修改日期:2020-05-31
  • 录用日期:2020-03-12
  • 在线发布日期: 2020-10-21
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