ULTRASONIC TOMOGRAPHY ANISOTROPY ANALYSIS OF SDW- 5ST1 CORES IN RESERVOIR CHARACTERIZATION FOR SADEWA FIELD, KUTAI BASIN, EAST KALIMANTAN
The SDW-5ST1 well is one of the cored wells of the Sadewa Field, one of the fields that will be developed. To determine the effect of anisotropy on the reservoir rock, the anisotropy of the core rock structure was measured using ultrasonic tomography where this tomography can give a smaller image...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/62052 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The SDW-5ST1 well is one of the cored wells of the Sadewa Field, one of the fields that
will be developed. To determine the effect of anisotropy on the reservoir rock, the
anisotropy of the core rock structure was measured using ultrasonic tomography where
this tomography can give a smaller image than seismic tomography. Data on the
anisotropy level of rock core samples was obtained by measuring the travel time of P
and S waves with ultrasonic tomography method. Measurements were made at various
angles based on the Vertically Transverse Isotropic (VTI) model. After the anisotropy
data parameters of rock core samples were obtained, an analysis of the relationship
between the anisotropy parameters and the physical and elastic properties of each
sample was carried out. Data from ultrasonic tomography measurements were also
processed using the MSIRT algorithm to produce data in the form of elastic properties
of rock core samples. After the anisotropy data parameters of the rock core samples
were obtained, an analysis of the relationship between the anisotropy parameters and
the elastic properties, physical properties, and petrographic descriptions of each
sample was carried out.
The core sample of SDW-5ST1 is sandstone from upper Miocene reservoir rock with
upper slope fan facies and deposited in a lowstand tract system. The results of the
evaluation of the upscaling factor showed that there was not a good enough correlation
between the well log data and the bataun core data in the upper slope fan facies. Based
on the influence of rock properties on anisotropy, for SDW-ST1 sandstone core,
anisotropy is influenced by layer structure, % clay, intergranular porosity, porosity,
permeability, acoustic impedance, Vp/Vs, shear modulus, bulk modulus, Young's
modulus, Poisson's ratio, and the lame constant. |
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