Geology & Geophysics

Static reservoir modelling to transition from POS to POM

Probability Of Suc­cess (POS) is the cen­tral concept for pe­troleum exploration. POS is used to predict dry well occurrence, risk an ex­ploration portfolio of pros­pects and eventually decide what gets…

Horsetail splays, wing cracks, and splay faults

These funny faults go by sev­eral names, but traditionally refer to the secondary faults and fractures that develop near the tips of a primary fault. Al­though these can occur on…

Exploration geology – science or art?

During my career in the oil industry, exploration geology has changed enormously. Not long after I joined Shell in February 1979, my son, who was play school age, asked me…

Subsurface exploration by plane

Data, particularly information about subsurface geology, is key to successfully exploiting natural resources, be they mineral, hydrocarbon or renewables such as geothermal and natural hydrogen. Especially in Africa, where large…

Deep-water Delaware

The featured photo shows a road cut in the Permian (Guadalupian) Brushy Canyon Formation off US Highway 62/180 in the foreground. The west-facing exposure, with the Delaware Mountains in the…

Translating and expansional McMurray point bars

In the captivating world of sed­imentary geology, point bars offer a window into the dynamic processes sculpting fluvial and near-coastal landscapes. The classical model of (expansional) point bars is best…

What can resistivity tell you about your prospect?

Over the last few years, significant advance­ments have been made in the field of seismic quality, fundamentally transforming the landscape of geological explo­ration. The increase in bandwidth coupled with improved…

Strike-slip kinematics for pop-ups and pull-aparts

Pop-ups and pull-aparts, re­leasing- and restraining-bends, positive- and negative-flower structures. These are the vari­ous names given to the little, and big, structures that develop along strike-slip faults. They often form…

Oman – beneath the surface

Much has been written, including in this mag­azine, about the fan­tastic outcrop geology of Oman, the wonderful exposure, the preservation of salt at surface in the arid climate, and the…

Uncertainty – the most important result of basin modelling

I have long wanted to write about uncertainties in basin modelling. Despite their general acknowledgement, they are commonly underestimated due to various biases and psychological pressures. Explorationists sometimes live in…

The cream of the outcrop

This panorama shows an Upper Miocene succession, la Rambla de Lanujar, in the Betic Cordillera, featuring in one of our field trips to Tabernas, Almería, Spain. Apart from being a…