Potential evaluation of methane hydrate as a future energy resource by seismic method.

甲烷水合物被认为是下一个世纪中预期的非常规天然气资源之一，因为甲烷水合物已经找到了大量的甲烷水合物。这是必要的，因此，要调查通过海洋调查对甲烷水合物的分布情况。BSR （Bottom Simulating Reflector） phenomenon is one of the hydrate distribution。但从某种意义上说，这并不清楚甲烷水合物中的地震波的行为。So it is important to establish the method of evaluating the resource amount from the various？teristics of seismic data。This study aims to roughly clarify the amplitude and Velocity of relation between hydrate amount and wave Velocity ities in hydrate layers。我们测量了弹性波的数量为3-相位伪水合物模型，在水力层中模拟了3-相位模型。这是理想的，如果我们可以使用甲基氢化物的实际样本来分析波传播的特征，但这是非常困难的。 ... More 在样本中合成甲基氢化物。因此，我们认为甲烷水合物的条件与冰冻或部分冰冻的水饱和样品相似。集成的和非集成的样本是用来分析波传播特征的。在实验中，各种条件下的波速度的样本是经过严格测量的，因为速度的变化可以被认为是由于seismic记录中最重要的指标的探索类似BSR。考虑到这些样本的物理特征，我们介绍了Laclaire等人的数字模型（1994年），已知为扩展生物学理论，并作为实验性地提供了“Sonic Transit Time-to-Porosity Transforms”。正如Fo 11 owin的结果所揭示的那样。两个或三个阶段的有用性模型是被证明的。Wyllie或Raymer的公式可以应用于集成的样品，但不能应用于未集成的样品。扩展生物学的理论将是有用的，以评估甲基水合物的总数量，但不需要几个参数来应用这个理论到不统一的样本中。Less（低）

Methane hydrate is considered to be one of the expecting non-conventional natural gas resources in the next century because the abundant amount of methane hydrate has been found. It is necessary, therefore, to survey the distribution of methane hydrate by seismic survey. BSR (Bottom Simulating Reflector) phenomenon is one of the guidelines of the hydrate distribution. But quantitatively it is not clear the behavior of seismic waves in and around the methane hydrate. So it is important to establish the method of evaluating the resource amount from the various characteristics of seismic data.This study aims to roughly clarify the amplitude and velocity of relation between hydrate amount and wave velocities in hydrate layers. We measured elastic wave amount the 3-Phase pseudo hydrate model, which simulates the 3-phase model in hydrate layers. It is ideal if we can use the actual samples of methane hydrate to analyze the characteristics of wave propagation, but it is very difficult to actu … More ally synthesize the methane hydrate in sample. Thus we assume that the condition of methane hydrate is similar to that of frozen or partly frozen water-saturated samples. Consolidated and non-consolidated samples are used to analyze the wave propagation characteristics. In the experiments, the wave velocity of samples under various conditions are intensively measured becourse the velocity variation can be considered as on of the most important indices for exploration like BSR in the seismic records. To consider the physical characteristics of these samples, we introduced the numerical models of Laclaire et al. (1994), known as Extension Biot's theory, as well as experimentally provided 'sonic transit time-to-porosity tramsform'. As the results the fo11owin concluding remarks are obtained.・ Usefullness of two or three phase models are demonstrated.・ Wyllie or Raymer's formula can be applied to consolidated samples, but not applied to unconsolidated samples.・ Extension Biot's theory will be useful to evaluate the total amount of methane hydrate, but not a few parameters are required to apply this theory to the unconsolidated samples. Less