Coal bed gas in Colombia: Current status

Abstract

Coalbed methane (CBM) has garnered growing attention in Colombia due to declining conventional energy resources and reserves, persistent mining accidents caused by methane explosions, and climate regulations aimed at reducing greenhouse gas (GHG) emissions. This study provides a review of the current status of CBM in Colombia, synthesizing geological, geochemical, and technical data to assess its development potential. Despite the significant coal reserves of Colombia, early CBM resource estimates were overly optimistic. Updated evaluations reveal that most coal seams exhibit low gas contents (<200 ft³/ton - 5.66 m³/ton), having gas saturations typically less than 50%. This level of gas content poses particular challenges for commercial development. In Colombia, four provinces or coal zones—Cundinamarca, Boyacá, Cesar, and La Guajira—show localized potential, with some samples exceeding 300 ft³/ton. However, reservoir modeling, particularly from the Umbita-Chinavita area (Boyacá), demonstrates that low permeability (<10 mD), thin and discontinuous coalbeds, and structural complexity may inhibit development. The gas quality in these areas also varies, with a methane content averaging 75%, which also places additional pressure on commerciality. Isotopic and hydrogeological analyses suggest a predominantly biogenic origin of methane, often linked to meteoric recharge of the aquifers. Despite technical promise, development faces significant barriers, including inconsistent laboratory standards for existing historical data, a lack of clear legal frameworks, insufficient infrastructure, and limited investor interest and research. Regulatory and institutional fragmentation between coal and gas authorities further complicates the management of CBM resources. To unlock the CBM potential, Colombia must implement standardized exploration practices, develop robust incentive structures, and conduct comprehensive feasibility studies incorporating desorption, adsorption, and isotopic data. This work concludes that while Colombia possesses notable CBM resources, substantial technical, economic, and regulatory challenges must be overcome before near-term commercial production can be realized. The findings provide a foundation for future exploration, policy reform, and sustainable energy strategies aligned with national safety and environmental goals.