GCA is an international advisory firm focused on the provision of integrated technical and managerial services and independent advice to all sectors of the oil and gas industry. For over fifty years GCA has provided both broad-based and detailed advice resulting in solutions-orientated, commercially viable and practical results designed to meet our client's specific requirements. GCA's across the board expertise - upstream, mid-stream and downstream - combined with the use of multidisciplinary teams encourages flexibility and responsiveness that adds value to all our clients and projects.