Citation: | LUO Di, CAI Feng. SEISMIC CHARACTERISTIC AND GENETIC MECHANISM OF FLUID ESCAPE PIPES IN SEDIMENTARY BASINS OF CONTINENTAL MARGIN[J]. Marine Geology Frontiers, 2017, 33(1): 1-10. doi: 10.16028/j.1009-2722.2017.01001 |
Fluid escape pipes, which are defined hereby as the highly localized vertical to sub-vertical pathways of focused fluid venting from some underlying source region, are developed widely in sedimentary basins of a continental margin. In seismic protiles, a fluid escape pipe can be divided into three components: root zone, leakage zone and pipe terminus. There are many types of fluid escape pathways and their components because of the difference in forming mechanisms, sources and fluid types. Therefore, Fluid escape pipes of different origin have different seismic characteristics. Hydraulic fracturing is frequently proposed as the mechanism for pipe formation. However, with the development of seismic exploration, we find out that hydraulic fracturing only is not enough to explain the formation mechanism of all types of pipes. There are other forming mechanisms including erosive fluidization, local subsurface volume loss collapse and syn-sedimentary process. The paper described the seismic characteristics of different pipes from the perspective of the three components of a fluid escape pipe. The formation processes of the four kinds of genetic mechanisms are also discussed in details.
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Pipes examples with different position to BSR(from reference [20])
Distribution of fluid escape pipe clusters(from reference [28])
Seimsic profile from offshore Namibia showing an parallel sided margins(from reference [22])
Seismic profiles showing variation in geometry of fluid escape pipes
Seismic profiles showing the root zone of fluid escape pipes
Seismic profiles showing the internal structure of fluid escape pipes(from reference [22])
Upward termination of fluid escape pipes at pockmarks (A) and amplitude anomal (B)(from reference [35])
Conceptual model of fluid escape pipe formed by hydraulic fracturing(from reference [21])
Conceptual model for fluid escape pipe formed by erosive fluidization(from reference [22])