TY - JOUR

T1 - Influence of surface topography variation on repeatability of buried receiver data in desert environment

AU - Lisitsa, Vadim

AU - Kolyukhin, Dmitriy

AU - Tcheverda, Vladimir

PY - 2015

Y1 - 2015

N2 - One of the main challenges in seismic monitoring is the repeatability of the experiment conditions. Among other reasons changes in surface topography over time may cause strong non-repeatability in acquired seismic data especially in desert environment where the sand dunes can move between surveys. In this paper we present a numerical study of the effects of free-surface variation, defined as homogeneous Gaussian random field, on the seismic data. We show that for homogeneous and 'simple' models repeatability metrics (such as NRMS and predictability) using the early arrivals as measured by buried receivers depend mainly on the perturbation, but not on the smooth trend of the free-surface topography. For models with complex near-surface velocity NRMS for the thin sand area (<5 m) is almost twice as high as in the thick sand area (>10 m). Moreover, we demonstrate that significant nonrepeatability (NRMS up to 70%) can be caused by just surface elevation changes.

AB - One of the main challenges in seismic monitoring is the repeatability of the experiment conditions. Among other reasons changes in surface topography over time may cause strong non-repeatability in acquired seismic data especially in desert environment where the sand dunes can move between surveys. In this paper we present a numerical study of the effects of free-surface variation, defined as homogeneous Gaussian random field, on the seismic data. We show that for homogeneous and 'simple' models repeatability metrics (such as NRMS and predictability) using the early arrivals as measured by buried receivers depend mainly on the perturbation, but not on the smooth trend of the free-surface topography. For models with complex near-surface velocity NRMS for the thin sand area (<5 m) is almost twice as high as in the thick sand area (>10 m). Moreover, we demonstrate that significant nonrepeatability (NRMS up to 70%) can be caused by just surface elevation changes.

UR - http://www.scopus.com/inward/record.url?scp=85019002772&partnerID=8YFLogxK

U2 - 10.1190/segam2015-5751306.1

DO - 10.1190/segam2015-5751306.1

M3 - Conference article

AN - SCOPUS:85019002772

VL - 34

SP - 244

EP - 248

JO - SEG Technical Program Expanded Abstracts

JF - SEG Technical Program Expanded Abstracts

SN - 1052-3812

T2 - SEG New Orleans Annual Meeting, SEG 2015

Y2 - 18 October 2011 through 23 October 2011

ER -