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Numerical Simulation On A Shale-Free Saturation Logging Based On PngNormal access

Authors: C. Yuan, C. Zhou, H. Yan, C. Li and F. Zhang
Event name: 9th Congress of the Balkan Geophysical Society
Session: 5.05 Borehole
Publication date: 05 November 2017
DOI: 10.3997/2214-4609.201702573
Organisations: BGS, EAGE
Language: English
Info: Extended abstract, PDF ( 2.14Mb )
Price: € 20

Summary:
Chlorine logging is an effective logging method to monitor oil saturation in the cased hole along with C/O logging and thermal neutron lifetime logging. The chlorine logging is slightly affected by the shale and is called a shale-free saturation logging here. In this paper, Monte Carlo simulation is employed to set up 3-D formation model to study replacing the traditionally chemical neutron source with controllable pulsed neutron generator (PNG) in chlorine logging. The logging response and the effect of different influential factors on the logging response are studied. The simulation results show that the ratio of capture gamma counts of chlorine spectrum to thermal neutron counts decreases linearly with the increasing of the oil saturation. The lithology and borehole size and fluid have a great effect on the logging response and must be corrected in the logging interpretation. In order to ensure a good application of chlorine logging, the formation water salinity should be larger than 40000 ppm. The simulation results guarantee the feasible use of PNG in chlorine logging.


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