b'AEGC 2021Short abstracts49: Gravimetric measurements of high pressure andconductivity of the rock between the transmitter and the temperature C1, C2 and C3 adsorption isotherms onreceiver. The positions of the transmitter and the receiver are Beetaloo Sub-basin shales varied to produce a tomographic data set.Mr Nicholas Lupton , Mr Michael CamilleriandThe survey was conducted with the Russian-built FARA borehole 1 1 system containing several electrical dipoles transmitting or DrMohinudeen Faiz 2 receiving radio signals in the kHz range.1 CSIRO Energy The thirteen cross-hole panels were designed to test the range 2 CSIRO of the RIM system and to search for additional mineralisation Exploration in Australias Beetaloo Sub-basin focuses on thealong a prospective zone between the Rosebery Fault and liquids, wet-gas, and dry-gas mature shales of the Kyalla andMt. Black Fault in the Cambrian-age Mount Reid volcanic Velkerri formations. Gas storage in these reservoirs occurs as freebelt. The mineralisation, consisting of sphalerite and galena, gas or additionally through adsorption to the surface of organicis significantly more conductive than the surrounding matter pores and clay minerals. The adsorbed gas component mayvolcanoclastic host rock.represent between 20 and 85% of total gas-in-place for shales,The high electrical resistivity of the volcanoclastic host rock and in the Beetaloo the co-production of wet gas componentsassured an effective range of the transmitter-receiver system in (e.g. ethane, propane) is also expected to improve the economicsexcess of 400 m.of gas production. Accurate characterisation of the adsorptionTomographic imaging of the survey data has identified several of these hydrocarbons is critical to developing accurate resourcetabular, down-dipping zones of low resistivity. There was estimates and understanding production behaviour. relatively little variation in the tomographic imaging with A gravimetric isotherm rig and measurement methodologyfrequency.was developed enabling accurate HPHT adsorptionFollow-up drilling intersected sulphide mineralisation in the measurements on shales. Adsorption measurement on shalevicinity of the RIM target zones.presents a challenge due to the low sorption capacity, as well as the requirement for high pressure and temperatureThe RIM system provided a cost-effective mechanism to either characterisation to approximate in situ conditions. For example,upgrade or sterilise large volumes of the exploration search an inter-laboratory comparison by Gasparik etal. (2014)space between existing drill holes in a brownfields settings. observed discrepancies of approximately 25% in CH 4sorptionThe imaging capabilities of the RIM system could be improved measurements in the high pressure range, and significantwith monitoring capability of the time-variations in transmitter variation in C 2 H 6measurements above 5 MPa. strength.Gravimetric isotherm measurements avoid cumulative errors of59: How do detachment properties influence the the volumetric method, and are less sensitive to the presencekinematics of normal growth faults? Insights from 3D of leaks, an important consideration for HPHT measurements. Equipment design allowed the CSIRO gravimetric rig toseismic reflection data from the Ceduna sub-basinovercome reported shortcomings of the method at highMrs Monica Jimenez 1, A/Prof Simon Holford2, A/Prof Rosalind pressures due to sample buoyancy and low sample mass,King3 and Dr Mark Bunch2and a calibration methodology using material with a known adsorption isotherm validated rig performance. The method1 University of Adelaidewas applied to measure CH 4 , C 2 H 6and C 3 H 8adsorption2 Australian School of Petroleum and Energy Resources, isotherms of four Beetaloo Sub-basin shales, with a range ofUniversity of Adelaide, Australiaorganic matter content, thermal maturity and temperatures.3 The University of AdelaideThe measurements were repeated using a volumetric isotherm method to enable comparison. The measured isotherms presentThe growth of gravity-driven normal faults exerts a critical the first published C2 and C3 isotherms for Australian shales. control on multiple elements and processes of the petroleum system. However, there is still a poor understanding of the interactions between the properties of detachment layers and 55: Radio Image Mapping at the Polymetallic Roseberythe evolution of growth faults in delta systems underlain by Mine in North-Western Tasmania mechanically-weak detachments. This study is focused on the White Pointer Delta system in the Ceduna sub-basin, which Dr Asbjorn Christensen 1, Mr Jon McLoughlin1 and Mr Roland Hill1 detaches on an overpressure shale layer deposited during the Albian-Cenomanian. Using the Ceduna 3D seismic survey, we 1 MMG present evidence of how changes in thickness, dip angle and In 2019 MMG conducted a suite of thirteen deep-seated cross- geometry of the Albian-Cenomanian detachment influences hole Radio Image Mapping (RIM) tomographic surveys alongthe kinematics of overlying, detachment-linked growth the northern extension of the polymetallic Rosebery Mine infaults. In the proximal region of the study, the detachment is North-Western Tasmania. relatively thin (0.2 to 0.5 s) with basal dips of 5-10. Normal faults located at this region, show constant growth during The RIM method is based on the attenuation of anthe Cenomanian-Maastrichtian. In central and distal areas of electromagnetic wave in a material. A transmitter is located inthe seismic survey, the thicker detachment has basal dips 2 one drill hole and a receiver in a nearby drill hole. The systemwith thrust faulting and dome structures. Faults at this area measures the amplitude and phase difference betweengrew by dip-linkage. Our study shows that a more consistent the transmitted and the received signal. This determinesand active evacuation of the detachment resulted in non-the attenuation rate, which can be used to estimate theinterrupted fault growth, while a thicker and more complex AUGUST 2021 PREVIEW 70'