PESA WA 2020 Young Professionals Speakers Night

PESA WA invites you to their November Young Professionals Speaker Night.

This is the perfect opportunity to socialise with your industry peers and enjoy two technical talks given by George Mills (Carnarvon Petroleum) and Partha Pratim Mandal (Phd student at Curtin)

Talk 1: George Mills

CO 2 rich magmatic hydrothermal fluids: The implications on Mungaroo reservoir quality, Southern Exmouth Sub-basin case study

Abstract:

Carnarvon Petroleum, in collaboration with CSIRO and UWA, aimed to investigate the mechanisms driving reservoir variability in the Late Triassic Mungaroo Formation in the Southern Exmouth Basin. The study focussed on the likely origins of the pore-occluding

cement through innovative applications of the fluid inclusion analysis technique combined with secondary ion mass spectrometry (SIMS). The wells of interest were Jurabi-1 and Swell-1, both situated on the Swell Trend and host markedly poorer reservoir quality when compared to nearby Late Triassic well penetrations, particularly to those located on the Alpha Arch.

The application of microthermometry and Raman Spectroscopy techniques to fluid inclusions trapped in the reservoir cements, identified the minimum temperature and pressure conditions of palaeo-entrapment and importantly highlighted a CO₂ dominated gas composition, which gave critical information on the likely geofluid properties, contributing to the pervasive cementation experienced in the wells.

The in-situ measurements of oxygen isotope composition of the quartz cements in both wells using the SIMS Cameca 1280 further demonstrated a parent fluid of likely magmatic origin which has migrated into the Late Triassic reservoir via deep-seated faults.

This is corroborated by the extensive magmatic activity observed throughout the Exmouth Sub-basin with mantle plume upwelling commencing in the Middle Jurassic, which was followed by regional mantle underplating and shallow intrusive emplacement in the Late Jurassic.

Biography

George Mills graduated with a BSc (Hons) degree in geology and resource economics from the University of Western Australia in 2014. In late 2014, George joined Carnarvon Petroleum as a geologist, where he continues to gain invaluable experience in new ventures and all aspects of exploration geoscience across the North West Shelf.

Talk 2: Partha Pratim Mandal

Deriving continuous least principal stress magnitudes at depth in unconventional gas shale from viscoelastic stress relaxation rheology

Abstract

We validated an general adoptability of viscous stress relaxation concept from laboratory controlled time dependent deformation data to derive least principal stress magnitudes at depths in unconventional gas shale. It considered simple viscous rheological model and geological stress accumulation by steady state tectonic strain loading. Laboratory gathered data reveal different viscoelastic behaviour of rocks mostly controlled by varying composition and the direction of measurement (perpendicular/parallel to the bedding plane). First, we apply this approach in a vertical drilled well of Canning Basin then verify in another vertical well of Perth Basin where the target resources are ultralow permeable unconventional shale gas. Release of stress over short to long time duration is captured by simple power-law rheology model. A continuous minimum principal stress magnitude profile at depth can be obtained from wireline logs through a combination of laboratory power-law fitting coefficient, geological horizontal stress accumulation by constant tectonic loading and uniform relative stress variation (Φ = S2-S3/ S1-S3) along depth.  Lithological variation of least principal stress magnitude matched with direct measurement of Diagnostic Fracture Injection Tests (DFITs) and leak-off test (LOT) data. Eaton’s extended model could not capture the stress layering affect precisely and may introduce more uncertainty because of its dependency on several parameters while viscous relaxation rheology model relies upon Young’s modulus and laboratory constituent parameters (n) describing time dependency of rock deformation.

Biography

Partha Pratim Mandal is a current PhD researcher and Sessional Academic at the Western Australia School of Mines (WASM), Curtin University. His research focuses on creating geomechanical workflows to conduct laboratory measurements of the deformation aspect of shale gas, including the viscoelastic deformation, stress partitioning factor of rock composition, multi-channel active and passive wave velocity recording and elastic anisotropy. He is the recipient of several scholarships and research grant such as RTP Scholarship, EAGE student fund, PESA Federal Post-graduate scholarship and AAPG Grant-in-Aid. He was the founding member and the president of EAGE-SEG student chapter at Curtin University and currently served as secretary of ASEG, WA branch. Previously he worked for six years as Imaging Geophysicist at PGS both in India and Australia. He received his first-class BSc degree in Physics (Hons) from the Presidency College, University of Calcutta, India and MSc Tech degree in Applied Geophysics from the IIT (ISM), Dhanbad, India.

Event Details:

Date: Tuesday, 24th Novemberber 2020 [5:30-7:30pm].
Venue: The Shoe Bar, Yagan Square

Ticket Prices:

Free: Please register for catering purposes. Nibbles will be provided

This event is exclusively for Young Professionals (Young Professionals under the age of 35) and early career professionals (people who have been working in the Oil and Gas industry for less than 5 years), so come along if you’re a student, graduate or working professional. Meeting your petroleum peers is a good chance to talk about your different background, experiences, projects and  companies with like-minded people in a very laid back and friendly setting.