PTTEP has completed an outpost well, WMG-D01 (DA) (Wang Mai Sung-D01 (DA)), in the S1 Reserved Area, onshore Phitsanulok Basin, on 2 April 2020, as an oil well. The well was drilled to a TD of 2,386 m using the â50151HDâ land rig. Spudded on 24 March 2020, the well located approximately 5 km southeast of the Sam Phaya C-01 oil discovery and 10 km northeast of the Pratu Tao field, likely targeted analogous sandstone reservoirs of the Upper Oligocene-Middle Miocene Lan Krabu Formation.  The previous exploration drilling activity in the block was Chik Yao A-02ST that was abandoned as dry on 21 September 2019. The new-field wildcat was drilled to a TD of 3,518 m, using the âGWT-11â land rig.  The Phisanulok Basin has proven to be a prolific oil province in onshore Thailand. New oil accumulations have been found in the heavily faulted geology over the years of exploration by PTTEP. Although new accumulations could be small, early and cheaper monetisation is possible due to mature extensive network of development in the surrounding area.  The S1 Reserved Area, which also contains the Sirikit field, is operated by PTTEP with 100% interest.  Background information   The S1 Reserved Area consists a total of 33 fields, 15 of them are producing including the Wang Mai Sung B field. PTTEP concluded the WMG-B01 oil discovery on 23 October 2014. The well was drilled to a TD of 3,424 m using the âGWT-11â land rig. It was spudded on 9 October 2014. Oil was discovered likely in the reservoirs of the Upper Oligocene-Middle Miocene Lan Krabu Formation.   The Phitsanulok basin is a north-south trending intracratonic rift, covering an area about 6,000 sq km over the central plains of Thailand. The basin fill comprises alluvial fan, fan delta, alluvial plain, lacustrine delta and open lake deposits, with sediments up to 8 km thick at the western of the basin. Thai-Shell and PTTEP carried out extensive exploration and the production activities of this basin and in particular at the Sirikit Field which originally contained over 100 MMboe (P+P) of recoverable reserves.   PTTEP acquired the operatorship of the Block S1 (Sirikit) complex on 30 December 2003, when it agreed to buy the entire right holdings of Thai Shell for around USD 205 million.
Thailand (Sukhothai Depression (Phitsanulok B.)) Wang Mai Sung B