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Petroleum Geology And Exploration Of The La Creciente Gas Field Lower Magdalena Basin, ColombiaNormal access

Authors: Juan F. Arminio, Rudyard Vega, Eduardo García, Franklin Yoris, Jairo Lugo and Gustavo Bertorelli
Event name: 10th Simposio Bolivariano - Exploracion Petrolera en las Cuencas Subandinas
Session: Aprendiendo del Pasado - Mirando Hacia El Futuro
Publication date: 26 July 2009
Organisations: ACGGP
Language: Spanish
Info: Extended abstract, PDF ( 2.16Mb )
Price: € 20

Summary:
The La Creciente gas field was discovered in November 2006 as part of renewed exploration interest in the Lower Magdalena basin and Colombia at large. The field is located 120 km southeast of Cartagena, in the west central part of the Lower Magdalena basin in the Cicuco High and 10 km due west of the Guepaje – Ayombe gas fields, discovered in 1992 when the last exploration activity was carried in the region. The discovery well for the main field, LCA-1, was spud slightly downdip the crest of a normal fault block located in a previously uncharted area, where the structure was defined with a new 2D survey acquired in 2005. The exploration rationale was to drill down dip along the south flank of the Cicuco High, in favorable charge position from the adjacent San Jorge sub – basin. The exploration target was the Oligocene Ciénaga de Oro Formation. Well LCA-1 was drilled to a total depth of 11,572 feet MD, testing commercial
gas in Ciénaga de Oro sands and poor gas flow in turbidites of the Porquero Formation. The reservoir is made of massive, clean calcareous quartz sandstones with gross thickness 450 to 700 feet and porosities in the range of 15% - 20%, gas permeability ranging 70 to 100 mD and net-to-gross ratio greater than 75%. This sand sequence is interpreted to be coastal and tidal-influenced deposits that onlapped the collapsed Cordillera Central in a transgressive context during the Oligocene and culminated with an Early Miocene maximum flooding event that provides top seal to the trap. Lateral closure is provided by favorable juxtaposition with Porquero shales along the updip boundary of the trap, a normal fault down to the northeast. Measured original pressure and temperature were 6,680 psia and 188°F respectively. Gas composition is 97.6 % methane with 0.05% CO2, no H2S and specific gravity 0.57. The gas is slightly wet, with an atypical 31° API condensate at 0.5 BBL / MMSCF ratio. The first appraisal discovery, well LCA-2, showed poorly developed reservoir facies. After a 3D seismic survey was acquired in
mid-2007, LCA-3 and LCA-4 were drilled as development wells in late 2007, and well LCA-2 was successfully sidetracked to the main reservoir in 2008. A second, smaller gas discovery was made in December 2007 with well LCD-1 to the northeast of the main field. © Copyright 2009 ACGGP. This paper was prepared for presentation at the X Simposio Bolivariano Exploración
Petrolera en Cuencas Subandinas held in Cartagena, Colombia, July 2009. This paper was selected for presentation by the X symposium Technical Committee following review of information contained in an abstract submitted by the author(s). Meanwhile, surface facilities were put in place and the field was tied to the Guepaje – Sincelejo 8” pipeline with a 9.2 km 12” pipeline. First gas from the “A” reservoir flowed in January 2008, less than 14 months after discovery.


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