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Seismic Previous HitAnisotropyNext Hit Modeling from Well Log in Talang Akar Formation, South Sumatra, Indonesia

Thariq Guntoro1, Intan Andriani Putri1, and Dwa Desa Warnana2

1Physics Department, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
2Geophysical Engineering Department, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia

Abstract

Old seismic modeling assume that the seismic wave propagate in the earth have a same value for every directions. In the real condition, earth layers is not as ideal as that. It has a very complex structure and a wave do not propagate as ideal as isotropic modeling. It propagate with a velocity which varying with the directions. Seismic wave velocity varying with the direction of propagation caused the Previous HitanisotropyNext Hit characteristics of rock. Because of that, the petrophysical analysis should consider the Previous HitanisotropyNext Hit parameters. The parameters can be aimed from physical characteristics measurement in laboratory and seismic reflection data. In this research, the Previous HitanisotropyNext Hit parameters or Thomsen parameters generated from well log data. Those parameters are ε, γ, and δ which known as Thomsen parameters. It represent elastics tensor constant aimed from stress and strain relationship in linear anisotropic medium and solid elastic. Generally, Previous HitanisotropyNext Hit characteristics influence by clay volume fraction, density, and seismic wave velocity. In this paper, the Previous HiteffectNext Hit of clay content to the Previous HitanisotropyNext Hit analysis in sandstone reservoir discussed. The case study is in G402 well in Talang Akar formation in South Sumatera, Indonesia. Previous HitAnisotropyNext Hit parameters aimed from the empirical relationship between clay content and body (compressional and shear) wave velocity. The value are ε = 0.14; γ = 0.15; and δ = 0.04. Those value are less than 0.2 so the well has a low Previous HitanisotropyNext Hit characteristics. Then, anisotropic Previous HitAVONext Hit (Amplitude Versus Offset) equation used to extract synthetics seismogram from isotropy and Previous HitanisotropyNext Hit model. The different between two models are shown in the synthetics seismogram. The Different of them shows that the Previous HitanisotropyTop model give the clearer amplitude, thus providing ease of interpretation and reduce the risk of failure in determining the location of the target zone.

 

AAPG Search and Discovery Article #90188 ©GEO-2014, 11th Middle East Geosciences Conference and Exhibition, 10-12 March 2014, Manama, Bahrain