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Many seismic anomalous bodies are formed in a oilfield in Iraq, resulting in frequent engineering accidents such as mud loss and sticking during the drilling of multiple nearby wells and high water reduction after production. Due to the low main frequency of seismic data, it is difficult to identify anomalous bodies and associated fractures. Oilfield development faces significant challenges. In this paper, an integrated method of seismic, geological and development is used to obtain wide-band and high-dominant frequency seismic data through high-resolution processing of seismic data. Combined with genetic analysis of abnormal body, real drilling and dynamic data, the abnormal body and associated fracture development area are identified and predicted comprehensively. Using 3D geological modeling and numerical simulation techniques, the abnormal body is described and evaluated in detail. The results of this study suggest the following. (1)The nonlinear frequency extension technique can significantly improve the frequency band of seismic data. When the main frequency is increased to 40 Hz, the pull down, dislocation, and discontinuity of the anomalous body become more obvious and easier to identify. (2) The anomalies in the study area are mostly strike-slip faults formed by extrusion or compression–torsion, as well as surrounding fractures, controlled by deep faults. (3) The Likelihood attribute describes the details of the abnormal body more clearly. Combined with the production characteristics, the anomalous body and fracture development area can be predicted. (4) Through 3D geological modeling and numerical simulation, the distribution of the anomalous body and associated fracture areas is finely described, and the reserves and physical parameters are quantitatively evaluated. The proposed technology has been used in a oilfield in Iraq. This technology using multiple-information to characterize the distribution of abnormal bodies and associated fractures, overcoming the shortcomings of a single method that cannot accurately evaluate associated fractures. The coincidence rate between the predicted results and actual drilling is greater than 90%, and the coincidence rate of historical matching of production wells near the abnormal body of numerical simulation is greater than 85%. The proposed method has great guiding significance for well location deployment and efficient development of oilfield.

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Application of Integrated Seismic Anomaly Identification Technology in Complex Carbonate Reservoir Exploitation

  • 会议论文

  • 发表日期：

    2025年

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  • Ting-ting Huang,
  • Chong Han,
  • Hong-xi Li,
  • Ming-jiang Chen,
  • Li Zhang,
  • Qiang Wang,
  • Juan Wang,
  • Wen Deng

摘要

Many seismic anomalous bodies are formed in a oilfield in Iraq, resulting in frequent engineering accidents such as mud loss and sticking during the drilling of multiple nearby wells and high water reduction after production. Due to the low main frequency of seismic data, it is difficult to identify anomalous bodies and associated fractures. Oilfield development faces significant challenges. In this paper, an integrated method of seismic, geological and development is used to obtain wide-band and high-dominant frequency seismic data through high-resolution processing of seismic data. Combined with genetic analysis of abnormal body, real drilling and dynamic data, the abnormal body and associated fracture development area are identified and predicted comprehensively. Using 3D geological modeling and numerical simulation techniques, the abnormal body is described and evaluated in detail. The results of this study suggest the following. (1)The nonlinear frequency extension technique can significantly improve the frequency band of seismic data. When the main frequency is increased to 40 Hz, the pull down, dislocation, and discontinuity of the anomalous body become more obvious and easier to identify. (2) The anomalies in the study area are mostly strike-slip faults formed by extrusion or compression–torsion, as well as surrounding fractures, controlled by deep faults. (3) The Likelihood attribute describes the details of the abnormal body more clearly. Combined with the production characteristics, the anomalous body and fracture development area can be predicted. (4) Through 3D geological modeling and numerical simulation, the distribution of the anomalous body and associated fracture areas is finely described, and the reserves and physical parameters are quantitatively evaluated. The proposed technology has been used in a oilfield in Iraq. This technology using multiple-information to characterize the distribution of abnormal bodies and associated fractures, overcoming the shortcomings of a single method that cannot accurately evaluate associated fractures. The coincidence rate between the predicted results and actual drilling is greater than 90%, and the coincidence rate of historical matching of production wells near the abnormal body of numerical simulation is greater than 85%. The proposed method has great guiding significance for well location deployment and efficient development of oilfield.