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. 2021 Nov 2;11(1):21433.
doi: 10.1038/s41598-021-00860-z.

Development of one dimensional geomechanical model for a tight gas reservoir

Abhiram Kumar Verma  1 , Debasis Deb  2 , Akshay Chandan Dey  2 , Subrata Roy  2 , Ajay Kumar Singh  2 , V L N Avadhani  3 , Rajiv Ranjan Tiwari  3
Affiliations

Development of one dimensional geomechanical model for a tight gas reservoir

Abhiram Kumar Verma et al. Sci Rep. .

Abstract

Estimating rock-mechanical, petrophysical properties and pre-production stress state is essential for effective reservoir planning, development, and optimal exploitation. This paper attempts to construct a comprehensive one-dimensional mechanical earth model (1D MEM) of the Mandapeta gas reservoir of Krishna Godavari (KG) basin, India. The methodology comprises a detailed stepwise process from processing and analysis of raw log data, calibration of log-derived dynamic properties with static ones using regression models developed from tested core samples, and final rock mechanical property estimation. Pore pressure profiles have been estimated and calibrated with the Repeat formation tester (RFT) data for every thirty-five wells. Overburden and horizontal stresses have also been evaluated and calibrated using data from the Leak-off Tests (LOT) or Extended Leak-off Tests (XLOT). A menu-driven program is developed using PYTHON code for visualization and on-time revision of 1D MEM. The resulting comprehensive 1D MEM predicts and establishes the rock-mechanical properties, pore pressure, and in-situ stress values of the basin. Besides its use in planning future wells, development of the field, and yielding insight into the various well challenges, it can also be used to develop a 3D MEM of the reservoir.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Map showing the location of the KG basin in the Indian sub-continent.
Figure 2
Figure 2
A structural map showing fault traces by black lines and well positions by cyan dots.
Figure 3
Figure 3
Generalized stratigraphy of KG basin from onshore to offshore.
Figure 4
Figure 4
Flow chart for 1D MEM development.
Figure 5
Figure 5
Missing RHOB data determination by extrapolation method.
Figure 6
Figure 6
Regression model developed for Vp and Vs for different formations of the selected well.
Figure 7
Figure 7
Stress vs. strain curve developed after UCS test.
Figure 8
Figure 8
Regression model for static and dynamic properties such as (a) modulus of elasticity, (b) density, (c) UCS and modulus of elasticity, and (d) Poisson’s ratio.
Figure 9
Figure 9
Smoothened ∆t vs. depth curve and NCT plot for well # 01, 27, and 30, respectively.
Figure 10
Figure 10
Flow chart of TKinter GUI based on PYTHON platform.
Figure 11
Figure 11
Main window of GUI.
Figure 12
Figure 12
1D Mechanical earth model.
Figure 13
Figure 13
Estimation of in-situ stress and pore pressure for well (a) MD-01, (b) MD-27, and (c) MD-30.
See this image and copyright information in PMC

References

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