Invited Lectures

Title: Improved Characterization of Marginal Reservoirs by Integrating Geostatistics and Progressive Seismic Inversion
Venue: ARRC/CSIRO Auditorium, 26 Dick Perry Avenue Kensington, Curtin University, Australia

Date: 15th March, 2017

Abstract:
The existing approach in Reservoir Characterization (Seismic Inversion) in Seismic Interpretation is deterministic in nature; hence uncertainty is not possible, while the output from proposed method can handle the issues of uncertainty by developing a fully probabilistic methodology for incorporating prior uncertainty within the seismic inversion process. It will enhance the success rate of proposed drilling wells for Exploratory and Development/Appraisal along with technological upgradations/adoption for the same. It will be helpful for better understanding of the Reservoir Characterization. It will also encourage Industry-Academia collaboration for solving Exploration & Production challenges in marginal/depleted oil field with severe G&G uncertainties. The Inverted volume of the 3D block in probabilistic approach has been determined and various probabilistic reservoir attributes to address advanced reservoir modelling have been estimated. Furthermore, possible Exploratory and Development/Appraisal locations/prospects within the 3D block have been proposed and the stratigraphy and depositional system have been explained through effective interpretation.

Title: Root Cause Analysis for Subsidence/Uplift Observed at Offshore Field by Developing Suitable Geomechanical Model
Venue: ARRC/CSIRO Auditorium, 26 Dick Perry Avenue Kensington, Curtin University, Australia

Date: 16th March, 2017

Abstract:
The stress distribution associated with injection and depletion can make engineering wells a technical challenge in soft and /water sensitive formations. The Well-design and completion and operation are significantly impacted by the mechanical behaviour of the reservoir. We assume that the upliftment/subsidence might have resulted due to variations in pore pressure associated with fragile rocks. As the casing is cemented to the reservoir, it will follow the local rock displacements and therefore would fail if the imposed strains exceed a critical level. We propose to identify the Geomechanical causes of the problem encountered during reservoir development and help to identify production and completion guidelines to minimise or to prevent casing failure and to guide future activities. Essentially, 1D MEM for several selected wells has been developed from which 3D MEM have been deduced in blocks where the density of wells is high followed by seismic inversion and computation of properties from seismic data results. Subsequently, models for stress distribution and orientations have been developed and strength of rocks and stress between the wells have been estimated to determine the possible root cause for upliftment/compaction for different production/injection scenarios and to assess the possibility of structural problems such as casing collapse (Dynamic modeling using production data by means of finite element modeling).