Talos Energy, an oil and gas company based in the US, has completed the Zama appraisal programme in Block 7 in the offshore portion of Sureste Basin, Mexico.

Talos operates Block 7 in a consortium with partners Sierra Oil & Gas, a Wintershall DEA company, and Premier Oil.

The Zama-3 is the third and final appraisal penetration drilled by the consortium to better determine the Zama discovery’s resource potential. According to Talos Energy, the Zama-2 and Zama-2 ST1 appraisal wells, which were drilled in the first half of 2019, brought results in accordance with the expectations of the consortium.

The Zama-3 well has been drilled approximately 2.4km south of the Zama-1 location to test the southern extent of the reservoir and capture additional reservoir description data. The Zama-3 well logged approximately 1,000ft of gross true vertical depth (TVD) sand and 748ft of gross TVD pay bearing section.

The company claimed that the net to gross ratio across the pay section is consistent with prior penetrations, with Zone 3 exceeding expectations with a net to gross ratio of approximately 85-90%.

Talos captured 717ft of whole core with 99% recovery, the longest whole core from a single well offshore Mexico. The additional core samples will help the consortium evaluate expected recovery factors, completion techniques and other details to optimise recovery in the Zama field.

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Furthermore, Zama-3 well operations were concluded around nine days ahead of schedule and within budget.

Talos Energy said that the consortium is evaluating the data and samples collected from its four penetrations of the Zama reservoir, to produce an updated contingent recoverable resource report by the end of 2019. Based on preliminary information collected so far, Talos expects the updated value to be in the upper half of the previously provided pre-appraisal guidance range of 400-800MMBoe.

The consortium is also advancing its front-end engineering and design (FEED) work streams and unitisation discussions with Petróleos Mexicanos (Pemex) to make a Final Investment Decision (FID) on the project in 2020.

Talos Energy president and chief executive officer Timothy Duncan said: “With the collaboration of our Consortium partners, Pemex and the Mexican government authorities, we look forward to reaching FID as soon as possible and then turning our attention toward first oil.

“I’m extremely proud of our operating performance throughout the exploration and appraisal program, and we are excited to advance the project to full realization in the near future.”