【摘要】 以实际水合物存在的美国布莱克海台地震数据为例,利用地震剖面中四个层位(海底层、水合物顶层,水合物层和游离气层)地震数据,通过相干技术研究了四个层位地震波同相轴的连续性。结果表明:在同一层位中,随着时窗宽度的增大,所有时窗相干值的均值都逐渐减小;在相同时窗宽度下,相干程度最好的为海底层,其次为水合物层、水合物顶层及游离气层。由此,通过对比各层位的相干值,可以指示天然气水合物的存在,这为水合物识别及其开采提供了有价值的参考。更多还原

【Abstract】 The seismic data of the actual hydrate existence in American Blake Ridge was taken as an example.Seismic data in the four layers,namely the sea bottom layer,the top layer of hydrate,the hydrate layer and the free gas layer in seismic sections was used to conduct the coherence analysis research by the coherence technology.The results showed that in the same layer,the mean coherence value of all time windows gradually decreased with the increase of the width of the time window;in the same time window width,the best coherence degree was the sea bottom layer,followed by the hydrate layer,the top layer of hydrate and the free gas layer.Therefore,the existence of gas hydrate was indicated by comparing the coherence value of every layer,offering a valuable reference for the hydrate recognition and exploitation.更多还原