Newly reprocessed 2D and reinterpreted 3D seismic data in onshore North Perth basin permits in Western Australia has improved the imaging of both the South Erregulla and Walyering gas prospects, Strike Energy Ltd. said.
At South Erregulla in EP469, reprocessing of 23 historical 2D seismic lines was done using a common datum and amplitude and phase balancing. The result is a marked improvement in data quality and the company’s structural interpretation of the prospect.
The new work immediately confirms the presence of a gross 4-way dip closure over the greater Erregulla South structure and increases confidence in the presence of a sealing fault up-dip of the northwest arm of the structure.
The company has put a P50 estimate of 1.6 tcf prospective resource on South Erregulla and says that the connectivity of the South Erregulla structure to West Erregulla field is well imagined, supporting a high confidence in finding an equivalent trap-seal combination that is likely to hold conventional, quality hydrocarbon-charged reservoir.
Strike will now reprocess additional 2D lines to generate further information on the target and surrounding areas. The new data will be coupled with the Trieste 3D seismic survey that is being fast-tracked through its processing workflows.
At Walyering in permit EP447 to the south of the Erregulla prospects, final, post-stack 3D data has been fully interpreted. Good quality data indicates the presence of a high confidence wet gas accumulation up-dip of the earlier Waylering-4 well.
The new data shows Walyering structure is comprised of several fault blocks that are linked to form a grossly antiformal structure with 4-way dip closure. Direct hydrocarbon indicators have been observed across the Walyering data from spatial and optical stacks.
Tests of the Cattamarra sands in three wells (Waylering-1, -2, and -3) have shown the presence of a sweet liquids-rich gas estimated 25.4 bbl condensate per million cu ft of gas.
Strike has 100% of EP 447 and shares EP469 50-50 with Warrego Energy Ltd.