About us

Chronosurveys, Lda brings together the best of the Oil & Gas and Mining Industries and Academia.


We are a group of independent consultants with experience in the Oil & Gas and Mining industries and specialist researchers in Academia that provide integrated services on Stratigraphy. We also provide intellegence services and products on energy and mineral commodities business in several regions of the World.


Our vision is to provide state of the art geological consulting at competitive rates using both standard and innovative techniques respecting the environment and fostering societal development according to our sustainability statement.


Chronosurveys, Lda is based in Portugal with office in Almada and partner laboratories in Portuguese and other European Universities.


Some of the projects our consultants have worked with:

Who we are

Gil Machado, Founder and Technical Director

is a Petroleum Exploration Geologist with a Ph.D in stratigraphy and source rock characterization. After a short experience in the mining industry, he has worked for Oil & Gas companies for the past 10 years in Exploration Geology and biostratigraphy, dealing with projects in the Middle East, Brazil, Angola, Mozambique, Morocco, among others. His experience ranges from Regional prospectivity reports, data room and bid round evaluation to seismic interpretation and prospect generation, well correlation, source rock characterization, geological reservoir and siliciclastic rocks characterization. His biostratigraphic expertise is Paleozoic Palynology

Sara Delgado, Founder and Logistical Director

is a International affairs and political analyst, with a Bachelor degree in Political Science and International relations. She has worked in the public and private sectors in areas relating to international security, economic development, fraud detection among others, focusing on Europe, West Africa and Portuguese speaking countries.


Ana Bento, Nannofossils expert

Ana is a Geoscientist - Stratigrapher with over 6 years of experience in the petroleum industry. Ana holds a B.Sc. and M.Sc. by the Faculty of Sciences, University of Lisbon  At CGG-Robertson, Ana worked on Cenozoic and Mesozoic wells from Tanzania, South Africa, West Africa, North Sea, Portugal, Egypt, US, Canada and Jamaica. In addition she has worked offshore in the North Sea, monitoring the stratigraphy of a HP/HT well (biosteering). She extended her knowledge in Basins and Plays studies of East of Brazil (from Pelotas to Pernambuco-Paraíba basins). Her experience includes Biostratigraphic and Regional prospectivity reports, stratigraphy interpretation, data management, well correlation, source rock and reservoir characterization.

Liang Chen, Meso-Cenozoic palynology expert

Liang Chen holds a PhD from the University of Bremen (Germany) and has been working as biostratigrapher since 2012 (Ichron, RPS and now as an independant consultant), focusing on Meso-Cenozoic palynology. His experience includes the Pleistocene ‐ Jurassic sections of the North Sea, West of Shetland, Norwegian Sea and Barents Sea (UKCS and NOCS), with extensive work on the  Paleogene reservoirs of West of Shetland basins and Early Cretaceous – Early Triassic interval in the Barents Sea (Kolmule ‐ Havert Formation). Currently Liang Chen is the Director of Focus Biostrat Limited based in the UK.

Partners - academia

Faculty of Sciences, University of Lisbon

Home to several of our academic consultants, the Faculty of Sciences hosts the leading Earth Science research Institute in Portugal, the Instituto Dom Luiz. The Geology department provides logistical, technical and scientific support to many of our activities.

Dipartimento di Fisica e Geologia University of Perugia

Hosts a leading group on latest Paleozoic-Mesozoic carbonates and foraminifera, with Worldwide experience on both academic and industrial projects.

Portuguese and European Universities

We have a vast network of academic consultants, specialists in a time interval, fossil group, geological setting, etc, that allow us to provide the best service possible for your project.

Partners - companies

GEPlan consulting

GEPlan Consulting is an oil and gas consulting firm that can provide innovative and integrated services for new join ventures and for exploration, appraisal and development projects. GEPlan offers a wide range of expertise in integrated basin analysis and has acquired a wide experience in the characterisation of the complex reservoirs and it has given support to several companies all around the world in the development of their reservoir models.

Pioneer Energy and Minerals consulting

Pioneer Energy and Minerals Consulting (PEMC) is an exploration company operating from Windhoek, Namibia. We offer consultancy services to both the Mineral and Petroleum Sectors. PEMC focuses on the field of Earth Sciences. We strive at delivering high quality, innovative and cost effective solutions. 


Geode-Energy supplies leading data analysis expertise to the upstream oil, gas, geothermal and water business. Our company now operates in diverse countries supplying geological geo data analysis services. Geode Energy expertise includes Facies Analysis and Sedimentary Models from cuttings and core and petrophysical data as well as innovative workflows in fracture and porosity characterisation in Shale, Clastics and Basement Rocks.

Badley Ashton

Badley Ashton was established in 1982 as a high quality geoscience consultancy, providing specialist reservoir description and prediction advice to the oil and gas industry worldwide. Thirty-five years on, our emphasis on quality remains the same today, with a progressive ethos driven by continuous scientific excellence.