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Reservoir fluid identification and elastic modulus determination using AVO
Santoso D.a, Alam S.b, Hendrajaya L.a, Alfiana, Munadi S.c, Purwokob
a Geophysical Program, Department of Geology, Bandung Institute of Technology, Indonesia
b PERTAMINA, Indonesia
c LEMIGAS, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]AVO analysis based on the increase of reflected amplitude with increasing distance between source and receiver. This anomaly has been proved to be useful for gas identification from seismic data. A specific inversion technique has been developed to estimate the Poisson’s ratio from AVO anomaly. It based on the Shuey (1985) formula and the implementation of generalized linear inversion proposed by Marquardt (1963). The technique adjusts the convergence of the iterative process in order to find the unknown parameters by considering the available observed data. Once the Poisson’s ratio is obtained, the velocity of the S wave can be estimated and the elastic properties of the reservoir rock such as Young’s modulus can be derived. Application of this technique to a limestone reservoir of the Cicauh area in the North West Java Basin gives the value of Young’s modulus of about 23392 MPa. The porosity which derived from this value was 36.6% which is very close to well data. According to the Wren (1984) diagram the P wave velocities of 2700-3550 m/s correspond to reservoir rocks of sandstone containing fluid. In fact according to the well data, it is a limestone containing gas. Therefore, a special diagram showing the relationship between P wave velocities and Poisson’s ratios should be developed. It will be useful in identification of reservoir fluid by means of AVO before drilling.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Amplitude Variation with Offset,Reservoir gas identification[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1016/0926-9851(96)00017-1[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]