The latest issue of our PESA News magazine is now available to all our members here

Loading Events

« All Events

  • This event has passed.

LIVE WEBINAR: Significance of Grain Coating that Preserves Porosity in Deep Sandstone Reservoirs: Case Studies from Australian Basins

Tuesday, 26 July, 2022 @ 11:00 am - 12:00 pm (Australia/Perth time)

Free – $10.00

Guest Speaker(s): Saju Menacherry

Dr. Saju Menacherry is a Reservoir Quality Geologist with 18+ years of international experience in the oil and gas industry, with an integrated approach for reservoir quality characterisation and prediction for exploration, field development and production optimisation. Dr. Saju has held various roles at Chevron, Carnarvon Petroleum, Beach Energy, Strike Energy, Saudi Aramco, University of Adelaide for CO2CRC, Whistler Research, Mobil Oil Australia and mining organisations in India. He has considerable experience in working with integrated multidisciplinary teams at all stages of exploration, development to production. He has expertise in integrating clastic diagenesis and reservoir quality aspects of rock properties through petrography, formation evaluation, well-logs, sequence stratigraphy, basin modelling data, petrophysics, geophysics and geomechanics data, wellbore and reservoir integrity assessment, production chemistry analysis, sand and fines migration prediction. Saju is an internationally recognised and an enterprise-wide subject matter expert, advising and mentoring on workflow development and best practice in reservoir quality, sedimentary petrology and sedimentology. In addition, Saju has experience working on integrating the petrographical, petrophysical and sequence stratigraphic data for the CO 2 storage site characterisation projects including Chevron’s Gorgon CO 2 and multiple CO2CRC Projects in Australia. Saju holds PhD in Petroleum Geology (funded and trained by ExxonMobil) from the University of Adelaide, Australia, an MSc degree in geology from Kerala University, India and a BSc Geology, with Chemistry and Statistics as subsidiaries from University of Calicut, India. He has authored over 25 reservoir quality characterisation and reservoir quality risk assessment reports, (co-) authored over 15 peer reviewed articles and presented more than 35 international conference presentations. He has Co-Chaired for AAPG international conference sessions, Clastic Diagenesis group and other international conferences. He was awarded the best runner up poster presentation from SEPM/AAPG international conference in 2006. His professional affiliations are in AAPG, SEPM and PESA.

Kindly supported by Rock Flow dynamics


This live webinar will take place at:

11am              – Perth
12.30pm       – Darwin, Adelaide
1pm                – Brisbane, Canberra, Hobart, Melbourne, Sydney

Use the calendar link on this page to add this event in to your own calendar at the correct local time for your location.

Tickets are free for members (please log in to see this) and $10 for non members.

Please buy your tickets and immediately follow the link in the ticket e-mail (not the calendar invite or this webpage, which is just generic and not event specific) to set up your registration with the webinar software well in advance of the time of the talk. Once registered with the webinar software you will receive a reminder e-mail 1 hour beforehand.

Significance of Grain Coating that Preserves Porosity in Deep Sandstone Reservoirs: Case Studies from Australian Basins

Presented by Saju Menacherry


Diagenetic events are responsible for the subsurface modification of the sediments after it was deposited and buried to the present depth. Understanding the origin of grain-coating clays or micro-quartz coating and its effects on the inhibition of quartz overgrowth cements plays a crucial role in preservation of porosity in deeply buried sandstones. This talk discusses grain-coating by chlorite clay from three different basins of Australia, such as Bedout Sub-Basin, Northern Carnarvon Basin and Perth Basin and grain-coating by micro-quartz from Northern Carnarvon Basin and their effect on the preservation of porosity and permeability for better reservoir quality.

The study is based on petrographical and mineralogical investigations using the conventional optical microscope, scanning electron microscope (SEM) equipped with a dispersed energy spectrometer (EDS), and X-ray diffraction (XRD). In Northern Carnarvon Basin the chlorite grain-coating, found occasionally under the stratigraphic and sediment provenance-controlled areas of wells like Banambu Deep-1, Vos-1 and Homevale-1. The presence of chlorite coating on quartz grains inhibits later quartz cementation (especially >80 degrees C) and thereby preserves the intergranular primary porosity up to 26%.

High reservoir quality commonly correlates with the occurrence of chlorite grain-coating in Bedout Sub-Basin and consequent inhibition of quartz cementation in Caley Member sandstones. Correlated with petrographic analyses, the reservoir sandstones show a trend towards higher porosity (up to 24%) with increasing chlorite grain coating coverage. In Perth Basin, the good reservoir with high porosities and better permeabilities are mainly found in Kingia and High Cliff sandstones where the higher chlorite clay grain-coating and low to very low quartz / or carbonate cement content, of which the porosity is preserved up to 20%. The micro-quartz grain-coating in Northern Carnarvon Basin is associated with the shallow Mungaroo Formation under Wheatstone-Iago and Pluto Fields. The reservoir quality is controlled mainly by early formed grain-coating of microcrystalline quartz that precipitated from the dissolution of sponge spicules which significantly inhibits quartz overgrowth precipitation and thus preserves primary (intergranular) porosity up to 32% at deeper depths. The new data derived from the integration of petrographical analysis with burial diagenesis and quantitative interpretation techniques can predict the reservoir quality and rock properties (e.g., geochemical, geomechanical, petrophysical) that directly influence good reservoir presence, lower pre-drill risk allocation, resource estimates and optimised recovery strategies.


Tuesday, 26 July, 2022
11:00 am - 12:00 pm
(Australia/Perth time)
Free – $10.00
Event Categories:
  • Organisers

    PESA Western Australia
    PESA Webinars

    Registration Details

    Please select the number of tickets you wish to purchase and then press the "Get Tickets" button.


    The numbers below include tickets for this event already in your cart. Clicking "Get Tickets" will allow you to edit any existing attendee information as well as change ticket quantities.
    Tickets are no longer available