基于绕射波的碳酸盐岩储层缝洞识别方法及应用
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P631

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国家自然科学基金企业创新发展联合基金项目(U19B6003)


Development and application of an identification method for fracture and cave in carbonate reservoir based on diffracted wave
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    摘要:

    在塔里木盆地北部奥陶系碳酸盐岩储层中,沿断裂发育的溶洞和裂缝是重要的油气储集空间。因此对于缝洞型油藏的地震识别,关键在于断裂、裂缝和溶洞的刻画。溶洞和裂缝等储集空间存在形态多样性、多尺度性和非规则性,导致其地震响应通常表现为复杂的绕射波特征。基于绕射波的识别方法可从地震数据中去除反射波,只利用地震波场中的绕射信息进行分析。为此,本文首先基于平面波破坏滤波和均值滤波技术,从常规反射波数据中分离出绕射波数据;然后对比了不同分离程度的绕射波数据对溶洞的刻画能力;最后基于绕射波实际资料,对比分析了相干属性和最大似然属性对断裂和裂缝的识别能力。实际资料的应用表明,绕射波信息能够有效地识别溶洞、小尺度断裂和裂缝等地质体,对碳酸盐岩缝洞型油气藏研究具有重要意义。

    Abstract:

    In Ordovician carbonate reservoir in the north of Tarim Basin, karst caves and fractures developed along faults are important reservoir spaces. The key to seismic identification of fracture-cavity reservoir lies in the description of faults, fractures and karst caves. Because of the diversity, multi-scale and irregularity of reservoir space, such as karst caves and fractures, the seismic response usually shows complex characteristics of diffracted wave. The identification method based on diffracted wave can remove reflected wave from seismic data and only use diffracted information in seismic wave field for analysis. Therefore, based on plane wave destructive filtering and mean filtering, diffracted wave data are separated from conventional reflected wave data. Then, the ability of the diffracted wave data to describe the cave is compared. The fault recognition ability of diffracted wave data is compared and analyzed by combining the coherence attribute and likelihood attribute. Based on the actual diffracted wave data, the recognition ability of coherence and likelihood to faults and fractures is compared. The application of actual data shows that diffracted wave information can effectively identify geological bodies such as karst caves, small-scale faults and fractures, which is of great significance for the study of fracture-cavity carbonate reservoirs.

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谢玮,毕臣臣,胡华锋,等. 基于绕射波的碳酸盐岩储层缝洞识别方法及应用[J]. 科学技术与工程, 2021, 21(2): 453-457.
Xie Wei, Bi Chenchen, Hu Huafeng, et al. Development and application of an identification method for fracture and cave in carbonate reservoir based on diffracted wave[J]. Science Technology and Engineering,2021,21(2):453-457.

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  • 收稿日期:2020-04-19
  • 最后修改日期:2020-10-14
  • 录用日期:2020-07-25
  • 在线发布日期: 2021-02-07
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