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.
Highlights
A significant slope reversal happened in the drifting stage by south west tilt of the basin marked by widespread marine transgression in Cretaceous with marine shale deposition in the current Raghavapuram shale s equence[12]
The mechanical earth modeling process starts with the gathering, analysis, and refinement of the available data
This study presents a detailed workflow of developing a one-dimensional mechanical earth model for a reservoir
Summary
KG basin is a proven petroliferous structure located in the central part of the eastern continental margin of India[12] The basin is characterized by an extensive deltaic plain formed by two east coast rivers, Krishna and Godavari, with a horst and graben structure trending NE–SW, mimicking the rifting of Indian craton from Gondwana land in early Mesozoic. The basin consists of sediments deposited through various periods of geologic history, starting from rifting, syn-rift, drift to the late-drift stage. The current studied area, unconformably overlie the Kummugudem and forms the reservoir rock. In the rift/syn-rift stage in Permo-Triassic to Early Cretaceous, broadly lagoonal, fluvial to brackish water sediments are deposited with a basinal tilt in sloping north east[14]. The field has been subdivided into twenty-four fault blocks by the horizontal major and longitudinal minor faults
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