塔河地区奥陶系碳酸盐岩储层溶洞断裂定量分级技术
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Quantitative classification technology of karst cave and fracture in carbonate reservoir
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    摘要:

    有利缝洞带的准确预测可有效提高碳酸盐岩储层钻井的放空漏失率,达到油藏动用目的,对于断溶体内部缝洞储集体溶洞及断裂进行分级尤为重要,本文探索应用了断裂发育模式、断裂规模分级及基于构造曲率的应力分析进行断溶体内部断裂的分类、分级研究;提出基于正演模型论证及实钻分析,应用振幅、波阻抗综合分级,并进行了实钻井标定验证,形成了溶洞分级标准。本文以塔河某研究区为例进行了应用,将该区断裂带按照规模和应力性质分为八个级别,实钻井表明拉张区储集性能明显优于挤压区。并在该研究区确定了孔洞-溶洞分级的地震属性门槛值,“串珠”位置能量比值范围在54%-62%为孔洞,能量比大于62%为溶洞。最后利用实钻井分析验证了该技术的可靠性。

    Abstract:

    Quantitative classification of fracture-cavity bodies can effectively improve the prediction accuracy of favorable fracture-cavity zones and enhance reservoir development. This paper explores the classification and grading of internal faults within fracture-cavity bodies by applying fracture development models, fracture scale classification, and stress analysis based on structural curvature.Through forward modeling demonstrations and actual drilling analysis, a comprehensive classification of amplitude and wave impedance is conducted, followed by large-sample calibration and verification to establish a karst-cave grading standard. In this study, a specific area in Tahe is used as an example. The fault zone in this area is divided into eight grades based on their scale and stress properties. Real drilling data demonstrates that the reservoir performance in the extension area is significantly better than that in the compression area; The threshold value of seismic attributes for hole-cave classification is determined within this study area. The energy ratio range of "beads-on-string" features is identified as 54% -62% for holes, and the energy ratio is greater than 62% for karst caves.Finally, the reliability of this technology is verified through real drilling analysis.

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王鑫,邓光校,霍晗勇,等. 塔河地区奥陶系碳酸盐岩储层溶洞断裂定量分级技术[J]. 科学技术与工程, 2024, 24(28): 12016-12024.
Wang Xin, Deng Guangxiao, Huo Hanyong, et al. Quantitative classification technology of karst cave and fracture in carbonate reservoir[J]. Science Technology and Engineering,2024,24(28):12016-12024.

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  • 收稿日期:2023-12-24
  • 最后修改日期:2024-08-03
  • 录用日期:2024-02-20
  • 在线发布日期: 2024-11-05
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