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• W2334371032 abstract "Abstract This paper presents the use of good quality field appraisal data to assess the shallow geohazards in locations planned for development well pads placement. For any hydrocarbon development, understanding the integrity of the surface and near-surface is important in the decision process of well pad placement and pipeline routing. The objective of this study was to assess risk of surface faults and the presence of shallow gas below the proposed surface facilities locations using available good quality 3D seismic, a high resolution digital elevation model and gas log data to analyse the shallowest 150m of the overburden in the development project area. The project area lies in the northern extent of the Albertine Rift basin, a tectonically active intracontinental rift system, with seismic activity in the region of 800 events per month. By detailed interpretation and analysis of the 3D seismic, the study provided an insight into the structural architecture of the near surface and occurrence of shallow gas. The seismic data was of such high quality that attributes such as Variance and Dip Azimuth were used to interpret both basement and sediment propagating normal faults that extended to surface. The majority of the faults were found to align with changes in the surface topography or drainage pattern seen on the high resolution digital elevation model. Using a fault proximity zone of 200m the pad locations were categorised with regard to probability of surface fault hazard, as low, medium or high risk. Out of the 27 well pads that were screened, 5 pads locations were found to be in the high risk category, with proposed pad locations falling within the defined 200m fault proximity. This formed an important decision criterion on choice of the surface facilities location. The work has demonstrated and identified high risk areas due to shallow faulting, with resulting pad moves whilst ensuring that environmental and social impact is minimised. In the studied area, no anomalously bright amplitudes were seen on the seismic in the shallow section. Also from the gas logs, no shallow gas was encountered in all 25 the exploration and appraisal wells in the area. The findings will also be taken into account in the pipeline routing process in order to minimise the traverse of major faults. Development of the hydrocarbon resource in the project area will involve drilling of about 200 wells and hundreds of kilometres of excavation for inter-field pipelines. Use of the 3D seismic has demonstrated to be effective in this setting with early detection of high risk areas due to near surface faults. This desktop study resulted in a significant reduction of the scope of additional surveys and therefore a significant reduction in the cost of pre-development." @default.
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• W2334371032 date "2015-12-06" @default.
• W2334371032 modified "2023-09-25" @default.
• W2334371032 title "Shallow Geohazards Assessment Study for Field Development Projects, Lake Albert Basin" @default.
• W2334371032 cites W2078136144 @default.
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• W2334371032 doi "https://doi.org/10.2523/iptc-18412-ms" @default.
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