1887

Abstract

Summary

The main seismic indication that points to presence of gas hydrates in the sedimentary section is a seismic reflector that roughly follows seafloor topography and crosscuts the reflections from lithologic boundaries and is known as “bottom simulation reflection” (BSR). To identify BSR in a seismic section where it is subparallel to lithologic boundaries, it is suggested to use velocity analysis that involves velocity spectrum computation and AVO analysis. It was determined that gas hydrate layer is recorded as a period of higher interval velocity values relatively to the overlying water layer and underlying sedimentary deposits. In the AVO results the BSR boundary shows itself as high wave dynamics with phase inversion (intercept attribute (I)), intensive positive anomaly (gradient attribute (G)) and negative anomaly (fluid factor attribute (FF)). The same attributes were also used to detect abrupt change in the gas hydrate structure at the points of contact with vertical gas fluid emission (gas column). It is noted that BSR completely disappears where gas hydrate crosses gas column, while intrusion of gas column into the gas hydrate layer results in appearance of complicated structures that are interpreted as mud volcanoes. The data provided in the article cannot be derived from regular interpretation of seismic sections but from AVO analysis only.

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/content/papers/10.3997/2214-4609.201702297
2017-09-11
2020-04-03
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