Vol. 22

Issue 2

Mud and water, that’s two words that come to mind when thinking about this second issue of 2025. Why? Our cover story delves into one of these unexpected things explorers find themselves dealing with when drilling frontier wells; observing something that does not meet their expectations. In this case, it is fresh water in deep-marine sands. When we published about this initially, quite a few people got back to us saying that they had seen this before as well. So we decided to collate all the input we received and dedicate the cover story to it. And here is where mud comes into play, as it is mudstones or clay minerals that form the source of fresh water. One of our feature articles looks at mud too, and how it shapes into diapirs. A great example of the drilling risks that are associated with it, and how they can be overcome.
But there is more than mud and water in this issue. We are pleased to welcome a new column from the team at Rock Flow Dynamics who will share with us the latest developments in reservoir modelling technology. Insights from the ones who are solving the challenges posed by operators that want bigger models, more data, and more speed.
Javier Hernández-Molina grew up at the sea-side, in the south of Spain. He dedicated his career to what happens in the big blue space when it comes to sediment distribution, experiencing increasing interest from the industry that is exploring deeper and deeper realms. He shares some great insights with us.
And there is more, way more. Take a look and enjoy the read.

Columns

FIRSTS

8 – Subsurface noise

10 – Energy matters – by Rodney Garrard

11 – Regional update – by Ian Cross

12 – Striking gas – The discovery that was supposed to be made last year

INSIGHTS

78 – A Geologist Ruins Everything – How we become geologists – by Juan Cottier

80 – Reservoir models – Why preserving a detailed facies reservoir model has everything to do with your graphics card

82 – HotSpot – Direct entry opportunities for every strategy across the Middle East and South Asia – by NVentures

84 – Basin modelling – A cool vitrinite reflectance model – by David Rajmon

85 – Faults and fractures – Deciphering Earth’s secrets – by Molly Turko

86 – Nothing beats the field – Carboniferous-Permian erosive contact, Kowala Quarry, Poland  – by Karol Jewuła

88 – Vertical Geology – On the HUNT for Somalian core

Features

COVER STORY

14 – Fresh water in deep-marine

EXPLORATION OPPORTUNITIES

20 – The Equatorial Margin of Brazil is open for business – TGS

46 – Deepwater exploration: It’s the hope that keeps us here – Searcher

OIL & GAS

26 – Why is the Orinoco Delta not known for its oil and gas?

27 – “Almost every foot of rock has oil in it”

28 – Why the term “fault block” is a useless way to describe a trap

30 – The hottest play in Canada

FEATURES

32 – Drilling around mud diapirs

34 – The well listeners

37 – Libya’s oil and gas renaissance – by Scott Parker, Core Laboratories

40 – Evaluating the uncertainty in a Saturation Height model – Paul Spooner, Geoactive

42 – Iran – not at a standstill

PORTRAITS

50 – On drift – F. Javier Hernández-Molina

GEOTHERMAL ENERGY

56 – Every site is different

57 – Bacterial life is everywhere in the subsurface

58 – The dominance of oil and gas at a geothermal conference

61 – Not-so-hot volcanic rocks in Saudi Arabia

SUBSURFACE STORAGE

62 – CCS – a roller coaster ride from an oil crisis to a climate change solution

64 – The benefits of being an oil veteran when assessing depleted fields for carbon storage

DEEP SEA MINERALS

68 – How spreading rates determine your exploration strategy – by Ronny Setså

69 – The world’s largest SMS deposits – by Ronny Setså

71 – India to auction first offshore mineral blocks – by Ronny Setså

NEW GAS

74, – Estimates of trapped hydrogen globally – a reality check – by Arnout Everts, AEGeo

69 – Iran to finally start producing helium – by Mariël Reitsma

70 – Hydrogen exploration potential in Uruguay – by Josefina Marmisolle, Cecilia Romeu, Santiago Ferro, Pablo Gristo, Juan Tomasini, Rodrigo Novo And Natalia Blánquez, ANCAP

Articles

Iran – not at a standstill

Iran is one of those countries you normally don’t hear a lot from. This is obviously exacerbated by the USA sanctions that are still in place and prevent the ex­change Read More

The well listeners

“ I recently gave a talk in Kuala Lum­pur,” says geologist and pore pressure specialist Karol Jewuła, “for which I made an overview of drilling-related issues with wells drilled from Read More

How we become geologists

Q: How do you know if someone is from the Isle of Man? A: Because they insist on telling you every five minutes! Every geologist has a story as to Read More