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为了便于分析拖曳式海洋可控源电磁(CSEM)法对天然气水合物储层的探测能力,本文通过建立一维含水合物储层模型,正演计算获得CSEM响应,综合分析CSEM响应与发射频率及收发距的关系,以及水合物储层厚度变化和储层电阻率变化的CSEM响应特征。研究表明,CSEM响应对水合物储层的电阻率和厚度变化十分灵敏,验证了拖曳式海洋CSEM法探测海底天然气水合物的有效性。
In order to analyze the capability of CSEM for detecting gas hydrate reservoirs, a one-dimensional hydrate reservoir model was established to obtain the CSEM response in forward modeling. The response of CSEM to the emission frequency And the relationship between transmitting and receiving distance, as well as the CSEM response characteristics of the change of reservoir thickness and the change of reservoir resistivity. Studies have shown that the response of CSEM is very sensitive to the change of resistivity and thickness of hydrate reservoirs, which verifies the effectiveness of towed marine CSEM method in detecting submarine gas hydrate.