Data-driven detection of well events in mature gas fields

The production optimization of mature gas fields is severely complicated by the occurrence of certain undesired well events such as salt precipitation, liquid loading, or gas/water coning. Learning from production data of periods in which such events have taken place could help operators improve the process optimization. However, due to the...

De-risking shallow geothermal energy storage in challenging urban environments

In 2017 TNO and GFZ combined a dense accelerometer based high resolution surface seismic survey with a fibre optic based Vertical Seismic Profiling (DAS VSP) survey. The combined survey took place on a narrow patch of land in a challenging, noisy urban environment, in Berlin, Germany. The objective was to demonstrate the possibility to acquire a...

Near-surface shear-wave velocity profiling with ambient noise seismic interferometry for geothermal exploration

We demonstrate in this geothermal exploration case study performed in The Netherlands that ambient noise seismic interferometry (ANSI) can be an effective and efficient method for obtaining surface wave dispersion curves, leading to shallow shear-wave velocity-depth profiles that can improve imaging of deep structures. As the ANSI method...

Deep learning history matching for real time production forecasting

The forecasting of gas production from mature gas wells, due to their complex end-of-life behaviour, is challenging and often associated with uncertainties (both measurements and modelling uncertainties). Yet, having good forecasts are crucial for operational decision making. In this paper, we present a purely black-box based approach, which...

CO2 injection in low pressure depleted reservoirs

Re-using depleted fields (and platforms and wells) offers advantages over developing storage projects in saline formations. However, with reservoir pressures after production sometimes below 20 bar, there can be a large pressure difference between the reservoir and the transport pipeline at the surface, which will be typically at pressures in...

Cementation in the Dutch upper Rotliegend siliciclastic reservoirs

The Permian Rotliegend Slochteren Formation is a prolific gas bearing interval in the Netherlands. However, their reservoir porosity and permeability can be locally severely degraded by diagenetic pore-blocking cements. This work focusses on the cementational control on the reservoir quality. The drivers and causes of cementation and its effect...

Petroleum geological atlas of the Southern Permian Basin area: overview SPB-atlas project-organisation and results

The Southern Permian Basin (also referred to as Central European Basin) is Europe s largest sedimentary basin. It is a typical intracontinental basin that evolved from latest Carboniferous to recent times and extends from eastern England to the Belarussian-Polish border and from Denmark to South Germany. The Southern Permian Basin Atlas (SPBA)...