PHYSICAL PROPERTY MODELS OF GAS HYDRATE BEARING SE...

PHYSICAL PROPERTY MODELS OF GAS HYDRATE BEARING SEDIMENTS AND AVA CHARACTER OF BOTTOM SIMULATING REFLECTOR

SONG Haibin12　MATSUBAYASHI Osamu2　YANG Shengxiong3　WU Nengyou3　JIANG Weiwei1　HAO Tianyao 1

（1.Institute of Geology and Geophysics，CAS，Beijing 100029，China；2.Geological Survey of Japan，Tsukuba 3058567，Japan；3.Guangzhou Marine Geological Survey，Guangzhou 510760，China）

Abstract：Physical property models of gas hydrate-bearing sediments and analysis of amplitude-versusangle（AVA）character of bottom simulating reflector are studied.The relationships between elastic properties and gas hydrate/free gas concentration are presented based on such models as weighted time-average and Wood's equation，seismic wave propagation in three phases effective medium and elastic modulus.The AVA character of different models is calculated and analyzed.The analysis of AVA character of BSR shows that different reflection coefficient values but similar configurations of AVA curves are given for different combinations of different concentrations of gas hydrate and free gas.(https://www.daowen.com)

Keywords：Gas hydrates Physical properties Concentration Amplitude-versus-angle Bottom simulating reflector

Originally Published in：Chinese Journal of Geophysics，2002，45（4）：569～579