scholarly journals Overpressure-generating mechanisms in the Blok F3, North Sea, Netherland

2021 ◽  
Vol 10 (2) ◽  
pp. 117-128
Author(s):  
Khusmia Karin ◽  
. Sudarmaji
Keyword(s):  
Pore Pressure ◽  
North Sea ◽  
3D Modeling ◽  
Acoustic Impedance ◽  
Normal Pressure ◽  
Interval Velocity ◽  
Impedance Inversion ◽  
Geological Conditions ◽  
Acoustic Impedance Inversion ◽  
Well Data

Block F3 North Sea is a block with pore pressure values that vary over time due to complex geological conditions such as burial and various sedimentation zones. Pore pressure is one of the important aspects that need to be analyzed as a basis for the identification of zones and overpressure mechanisms. Overpressure is a greater pore pressure condition than normal pressure and may cause drilling problems, such as kicks, blowouts, etc. This study calculated pore pressure values using the eaton method approach with well data and seismic data. Both data are integrated for generating pore pressure values in 1D and 3D. 1D Modelling uses Interactive Petrophysics 3.5, while 3D modeling uses Petrel software. In 3D modeling, the variables used are interval velocity and inversion velocity obtained by acoustic impedance inversion. The sub-variables used are the inversion density and the regression density obtained from well density acoustic impedance inversion. The existence of a 1D overpressure zone at a depth of 1,100 – 1,800 m with an overpressure value of 3,836 – 18,975 kPa. In addition, the overpressure value based on the 3D model is 8,000 – 18,000 kPa. The overpressure zone is validated using an acoustic impedance inversion model with a high value of 5,200 – 5,380 (m/s)*(gr/cc). Overpressure in Block F3 is predicted to occur from disequilibrium compaction..

scholarly journals Reservoir Characterizarion Using Acoustic Impedance Inversion and Multi-Attribute Analysis in Nias Waters, North Sumatra

2019 ◽  
Vol 34 (1) ◽  
Author(s):  
Fathkhurozak Yunanda Rifai ◽  
Tumpal Bernhard Nainggolan ◽  
Henry Munandar Manik
Keyword(s):  
Seismic Data ◽  
Acoustic Impedance ◽  
Source Rocks ◽  
Time Migration ◽  
Attribute Analysis ◽  
Impedance Inversion ◽  
Acoustic Impedance Inversion ◽  
Well Data ◽  
North Sumatra ◽  
Rock Lithology

Seismic method is one of the most frequently applied geophysical methods in the process of oil and gas exploration. This research is conducted in Nias Waters, North Sumatra using one line 2D post-stack time migration seismic section and two wells data. Reservoir characterization is carried out to obtain physical parameters of rocks affected by fluid and rock lithology. Seismic inversion is used as a technique to create acoustic impedance distribution using seismic data as input and well data as control. As final product, multi-attribute analysis is applied to integrate of inversion results with seismic data to determine the lateral distribution of other parameters contained in well data. In this research, multi-attribute analysis is used to determine the distribution of NPHI as a validation of hydrocarbon source rocks. In that area, there is a gas hydrocarbon prospect in limestone lithology in depth around 1450 ms. Based on the results of sensitivity analysis, cross-plot between acoustic impedance and NPHI are sensitive in separating rock lithology, the target rock in the form of limestone has physical characteristics in the form of acoustic impedance values in the range of 20,000-49,000 ((ft/s)*(g/cc)) and NPHI values in the range of 5-35 %. While the results of the cross-plot between the acoustic impedance and resistivity are able to separate fluid-containing rocks with resistivity values in the range about 18-30 ohmm. The result of acoustic impedance inversion using the model based method shows the potential for hydrocarbons in the well FYR-1 with acoustic impedance in the range 21,469-22,881 ((ft/s)*(gr/cc)).

scholarly journals Rock Physics Formula and RMS Stacking Velocity Calculation to Assist Acoustic Impedance Inversion that Constrain Well Data

2020 ◽  
Vol 5 (2) ◽  
pp. 68-72
Author(s):  
Handoyo ◽  
Mochammad Puput Erlangga ◽  
Paul Young
Keyword(s):  
Acoustic Impedance ◽  
Rock Physics ◽  
Well Log ◽  
Initial Model ◽  
Impedance Inversion ◽  
Acoustic Impedance Inversion ◽  
The Matrix ◽  
Using Data ◽  
Well Data ◽  
Interval Velocities

This research ilustrate the generation of acoustic impedance inversion in the absence of well log using stacking velocity input in Salawati Basin, Papua, Indonesia using data obtained from seismic lines and stacking velocity section. Initial acoustic impedance modelswere first before the inversion process and were created by spreading the value of well log data to the all seismic CDP. The calculated acoustic impedance logs from standard sonic and density logs were used to build the initial model of acoustic impedance.First, the stacking velocities was first interpolated on a grid that has the same size as the seismic data using by means of Polynomial algorithm. This was closely followed by the conversion of the stacking velocities to interval velocities using Dix’s equation. The matrix densities were estimated by simple rock physics approach i.e. Gardner’s equation as a velocity function. The initial model of acoustic impedance was calculated by multiplying the densities section and interval velocities section. The resulting initial model of acoustic impedance was inverted to obtain the best of acoustic impedance section based on reflectivity.

scholarly journals Stochastic Gabor reflectivity and acoustic impedance inversion

2018 ◽  
Vol 15 (1) ◽  
pp. 179-191
Author(s):  
Diako Hariri Naghadeh ◽  
Christopher Keith Morley ◽  
Angus John Ferguson
Keyword(s):  
Acoustic Impedance ◽  
Impedance Inversion ◽  
Acoustic Impedance Inversion

Delta reservoir characterization using complex trace seismic attribute method and acoustic impedance inversion method case study in KX field

2021 ◽  
Author(s):  
Rahadian Anggit Wirawan ◽  
Supriyanto Supriyanto ◽  
Yayan Sofyan ◽  
Dede Djuhana ◽  
Waluyo Waluyo ◽  
...  
Keyword(s):  
Acoustic Impedance ◽  
Reservoir Characterization ◽  
Inversion Method ◽  
Seismic Attribute ◽  
Impedance Inversion ◽  
Acoustic Impedance Inversion
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