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本文基于天然气水合物发育区特有的构造沉积特征对各种地球物理响应的敏感性,研究了地震属性、AVO分析、陡倾角地层反转速度场建立、及伪井约束波阻抗反演等地震技术在天然气水合物预测中的应用及其效果。通过多信息联合分析与融合策略,优化集成有效地球物理技术,形成一套可靠的天然气水合物探测技术与流程。实际表明:综合分析反射强度、瞬时相位、层速度、相对波阻抗、绝对波阻抗、及AVO截距剖面等特征资料是识别天然气水合物底界似海底反射(BSR)的有效手段;综合应用地震、相对波阻抗、绝对波阻抗、层速度等剖面的特征可提高天然气水合物识别的有效性:而瞬时频率、能量半衰时、层速度、AVO截距、AVO乘积、AVO流体因子等剖面特征的有效组合能更准确有效地识别BSR以下的游离气。文中所总结的一套预测天然气水合物的优化组合地球物理技术在我国南海海域中已取得良好效果。
Based on the sensitivity of tectono-sedimentary characteristics to various geophysical responses to natural gas hydrate development zones, this paper studies seismic attributes, AVO analysis, establishment of steep dip formation velocity field, and pseudo-well-bound impedance inversion Application in Gas Hydrate Prediction and Its Effect. Through a joint multi-information analysis and fusion strategy, we will optimize the integration of effective geophysical technologies to form a reliable gas hydrate detection technology and process. The results show that the comprehensive analysis of characteristics such as reflection intensity, instantaneous phase, velocity, relative impedance, absolute impedance and AVO intercept is an effective way to identify the bottom of the gas hydrate like seafloor reflection (BSR) , The characteristics of relative wave impedance, absolute wave impedance, velocity and other profiles can enhance the effectiveness of gas hydrate recognition. The instantaneous frequency, energy half-decay, velocity of layer, AVO intercept, AVO product, AVO fluid factor and other profile features The effective combination can more accurately and effectively identify the free gas below the BSR. The article concludes with a set of prediction of natural gas hydrate optimized combination of geophysical technology in China’s South China Sea has achieved good results.