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天然气水合物沉积层在常规叠后地震剖面上,一般表现为似海底反射(BSR)特征,常作为水合物识别的重要标志,但由于地震数据分辨率的限制与多解性的存在,类似的反射特征不一定是水合物的表现。本文先从南中国海神狐海域地质条件分析入手,综述研究区域天然气水合物发育的构造、沉积与运移环境;其次以加权方程与Zoeppritz公式的正演模拟为基础,讨论天然气水合物与BSR特征的关系;然后选取经过三口已钻获天然气水合物站位的地震测线,提取角度域共成像道集用于BSR的AVA特征研究;最后依据叠前地震弹性参数同步反演思路,对水合物重点赋存区域开展精细预测研究,获取了研究区域含水合物沉积层稳定带的分布特征与饱和度数。该方法可作为采用多道地震数据估算天然气水合物含量的一种有效技术。
Natural gas hydrate sediments, which generally appear as seafloor reflection (BSR) features on conventional post-stack seismic profiles, often serve as important landmarks for hydrate recognition. However, due to the limitation of resolution of seismic data and the existence of multiple solutions, similar Reflective features are not necessarily hydrate manifestations. In this paper, we start with the analysis of geological conditions in the sea of Poseidon in the South China Sea, reviewing the tectonic, sedimentary and migratory environment for the development of natural gas hydrate in the region. Secondly, based on the forward modeling of the Zoeppritz formula and weighted equations, the characteristics of gas hydrate and BSR Then the seismograms taken by the three stations of gas hydrate have been selected to extract AVA features of co-channel gathers for BSR in the angle domain. Finally, based on the simultaneous inversion of prestack seismic elastic parameters, the hydrate The study focused on the area of fine prediction, and obtained the distribution characteristics and saturation numbers of the stable zones of the hydrate-bearing sediments in the study area. This method can be used as an effective technique for estimating gas hydrate content using multi-channel seismic data.