基于OBS和MCS数据的水合物地层速度特征

doi:10.11978/2019040

Abstract

Abstract:

Natural gas-hydrate is a new clean energy resource. The geological conditions in Shenhu area in the northern South China Sea (SCS) are conducive to the formation and storage of gas-hydrate. It is difficult to obtain accurate velocity information from traditional multi-channel seismic (MCS) data, and we can only judge the vertical distribution of geological bodies from the time domain. Ocean bottom seismometer (OBS) is a widely used active-source seismic instrument, which can receive clearer air gun signals. Compared with MCS data, refraction seismic data of OBS profiles can reveal velocity information from deeper layers. In this paper, combining the advantages of MCS and OBS, we determine the reflection interfaces on MCS profile, and then obtain the initial model. The OBS and MCS stacking profiles are merged to determine the reflection interface in the OBS profile. The reflection and refraction phases of OBS stations were picked up, and the two-dimensional velocity model of hydrate region was obtained by forward modeling using RayInvr, which solved the difficult time-depth conversion problem in MCS. The final model shows the depth, thickness and velocity of hydrate and free gas regions; it also shows the depth and velocity characteristics of the deeper interface below BSR.

Key words: gas-hydrate, Bottom Simulating Reflection, Multichannel Seismic Exploration, Ocean Bottom Seismometer, refraction phases, forward modeling

CLC Number:

P738.4

Zizheng LI, Xuelin QIU, Lei XING. Velocity features of gas-hydrate stratigraphy based on OBS and MCS data[J].Journal of Tropical Oceanography, 2020, 39(2): 25-34.

Figures/Tables 9

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Velocity features of gas-hydrate stratigraphy based on OBS and MCS data

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