Toinet S.,Total E and P Angola |
Maultzsch S.,Total S.A. |
Souvannavong V.,Veritas Software |
Colnard O.,Veritas Software
First Break | Year: 2011
We have run a 4D pre-stack inversion on seismic data acquired over a giant field located in deep water offshore Angola. The objective was to obtain dynamic information from 4D seismic data. The 4D inversion workflow started with a prestack 3D inversion of the baseline seismic survey. Using the relative P-wave velocity variations computed by warping, the initial impedance model of the baseline was updated in order to build the initial impedance model for the monitor survey. The update was done through a 4D mask which defines where impedance variations are allowed between the baseline and monitor impedance volumes. Due to the poor impedance discrimination between shales and water-bearing sands, where 4D effects may occur because of salinity differences between injected and aquifer water, reservoir model information was introduced in the mask in order to locate water-bearing sands. Ranges of relative impedance variations computed by the inversion were limited by 4D constraints derived from reservoir simulations before first oil and at the time of the monitor survey. 4D inversion brought sharper images compared to other 4D attributes. The high quality of the 4D inversion results evidenced by quantitative quality controls has opened the way to quantitative applications in reservoir management. © EAGE.
Deplante C.,Total E and P Angola |
Jeanjean F.,Total E and P Angola |
Sebastiao V.,Total E and P Angola
76th EAGE Conference and Exhibition 2014, Workshops | Year: 2014
On a turbiditic deep offshore field covered by a recent yet conventional 4D baseline, a non-conventional route has been decided for the first monitor, to obtain seismic information related to dynamic heterogeneities but also better characterize reservoirs. The strategy decided for the first monitor (Ml), one year after first oil, was to shoot broadband and process twice:-One 4D-dedicated processing mapped to conventional (with a Fast Track and a Full Processing phase) in order to match the baseline characteristics and obtain quality 4D signal to help understanding the early dynamic behaviour of the field.-One 3D broadband processing aiming to improve the existing seismic for reservoir characterization purposes. The superior resolution of the 4D signal over conventional data helps pushing the interpretation below the 3D resolution limits and has helped identifying sedimentary features which have confirmed the interpretation model but are also difficult to map accurately. Using the 3D broadband processing results, small scale geological details previously guessed from conventional data and locally underlined by 4D signal (but only at places impacted by changes in saturation and pressure), can now be seen more clearly: a more comparable resolution is achieved for 3D and 4D.
Masse P.,Total E and P Angola |
Laurent O.,Total S.A.
Comptes Rendus - Geoscience | Year: 2016
This paper provides a review of the Geological exploration of the Angola Coast (from Sumbe to Namibe) from pioneer's first geological descriptions and mining inventory to the most recent publications supported by the oil industry. We focus our attention on the following periods: 1875-1890 (Paul Choffat's work, mainly), 1910-1949 (first maps at country scale), 1949-1974 (detailed mapping of the Kwanza-Namibe coastal series), 1975-2000, with the editing of the last version of the Angola geological map at 1:1 million scale and the progressive completion of previous works. Since 2000, there is a renewal in geological fieldwork publications on the area mainly due to the work of university teams. This review paper thus stands at the frontier between geology, natural resources and the history of geology. It shows how geological knowledge has progressed in time, fueled by economic and scientific reasons. © 2015 Académie des sciences.
Frangois B.,Total E and P Angola |
Proceedings of the Annual Offshore Technology Conference | Year: 2015
Local content was fundamental to Total E&P Angola's development philosophy for the CLOV mega- project, offshore Angola. The aim - To allow CLOV to provide with a lasting legacy in terms of human and facilities resources - was to achieve 10 million man-hours of local activity in Angola at first oil - A tenfold increase from Total's first deepwater development at Girassol - And the fabrication of 64,000 tonnes of structures in five domestic construction yards. Based on Total E&P Angola's policy of sustainable development, a plan was devised and executed that included specific health, safety, environmental and quality requirements and ethical standards, all in accordance with Angola's socio-economic and cultural characteristics. Local content challenges were identified at early stage of the project. It allowed the development of a sound strategy based on selection, management and execution. This resulted in the upgrades of three of the five fabrication yards which were implemented in a cost-effective and timely fashion to meet overall project cost and schedules. It was of paramount importance that if these yards were to perform essential work, they had to be manned with a skilled local workforce. Therefore, training was another key area of development for both the project team and contractors. Copyright © (2015) by the Offshore Technology Conference All rights reserved.
Meyer M.,Total E and P Angola
Proceedings of the Annual Offshore Technology Conference | Year: 2015
At early stage of the project, the CLOV project developed an innovative training with the target to certify new junior operators with a diploma (level 2 French Diploma) and hire them as operators for Total E&P Angola. For the first time in an affiliate, CLOV conducted an 18-month training program in Angola divided in 3 steps: An intensive English course (3 months), a scientific refresher course (2 months) and the upstream operators certification (13 months) in cooperation with Institut Francais du Petrole (IFP). This part-time training was divided into 22 weeks of scientific and technical courses and 18 weeks of "on the job training" meaning offshore training onboard FPSO. During all the period, numerous dedicated trainers from IFP and from Total E&P Angola were involved to supervise the trainees and interact with them. At the end of this program, trainees were selected and certified as upstream operators and hired by Total E&P Angola. Then they attended a "specific training" for CLOV. This new phase lasted 5 weeks during which the new operators had theoretical courses on CLOV facilities and hands-on exercises with a 3D tool, the Immersive Training Simulator (ITS). This ITS allowed them to familiarise with CLOV FPSO facilities and process, not yet achieved at that date. Then, the new operators were sent in Korea to participate in the commissioning activities before the FPSO sail away. They continued their training onboard Block 17 FPSOs in Angola during the FPSO tow and came back onboard at the arrival of CLOV FPSO in Angola to prepare the first oil. They are now professional operators for CLOV. This complete training program currently being deployed in Total affiliates will allow graduate operators with a 2 years diploma, to strengthen skills of local workforce and to build a win-win partnership with the country. Copyright © (2015) by the Offshore Technology Conference All rights reserved.