1D Vertical electrical sounding method applied to evaluate shallow gas potential associated with the Hsinying and the Niushan fields in SW Taiwan

Shi Chie Fuh, Hsin-Chang Liu*, Chia Yen Ku, Tzy Yi Chang

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations

Abstract

Through this study, 1D vertical electrical sounding (VES) method was for the first time applied to explore the hydrocarbon potential in Taiwan. The inverted results from VES survey were integrated with log correlation, log interpretation and seismic interpretation to evaluate the remaining reserve and the residual gas potential down dip of the Hsinying and the Niushan old gas fields (Fig. 1). Gas in the Eurchungchi reservoir of the former is biogas and that in the Liuchungchi reservoir of the latter is biogas mixed with minor thermal gas. Total number of 1D VES station surveyed for the Hsinying and the Niushan areas were 21 and 23, respectively. Instead of seismic grids, grids constructed from seismic interpreted horizons and fault and incorporated a stratigraphic configuration revealed on the seismic section were used to generate the stratigraphic based pseudo 3D VES inverted resistivity model from 1D inversion results. Instead of constant depth resistivity slicer, horizon attributes extracted from this pseudo 3D inverted resistivity volume within a depth window along the target horizons were used in the comprehensive interpretation and evaluation. VES Inverted resistivity horizon attribute map is more effective than VES inverted resistivity constant depth map in evaluating the remaining reserve or the residual gas potential of the target horizon. The inverted VES resistivity attribute along ECS_b (near Eurchungchi formation base) in the Hsinying gas field revealed the existence of remaining reserve which was proved by the HSY-8 tested in December 2017. Based on the resistivity log characters and the inverted VES resistivity attribute along the 300_M horizon (near the top of Liuchungchi formation in the Niushan field, spatial distributions of porous sand saturated with conventional gas, porous sand saturated with 100% brine, siltstone saturated with residual gas and shale were interpreted. The potential for both the conventional remaining reserve and down dip unconventional residual gas were concluded to be fair for the Niushan gas field.

Original languageEnglish
Pages1179-1183
Number of pages5
DOIs
StatePublished - 10 Aug 2019
EventSociety of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019 - San Antonio, United States
Duration: 15 Sep 201920 Sep 2019

Conference

ConferenceSociety of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019
Country/TerritoryUnited States
CitySan Antonio
Period15/09/1920/09/19

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