The Cenozoic evolution of the Roer Valley Rift System integrated at a European scale

International audienceThe Roer Valley Rift System (RVRS) is located between the West European rift and the North Sea rift system. During the Cenozoic, the RVRS was characterized by several periods of subsidence and inversion, which are linked to the evolution of the adjacent rift systems. Combination of subsidence analysis and results from the analysis of thickness distributions and fault systems allows the determination of the Cenozoic evolution and quantification of the subsidence. During the Early Paleocene, the RVRS was inverted (Laramide phase). The backstripping method shows that the RVRS was subsequently mainly affected by two periods of subsidence, during the Late Paleocene and the Oligocene–Quaternary time intervals, separated by an inversion phase during the Late Eocene. During the Oligocene and Miocene periods, the thickness of the sediments and the distribution of the active faults reveal a radical rotation of the direction of extension by about 70–80j (counter clockwise). Integration of these results at a European scale indicates that the Late Paleocene subsidence was related to the evolution of the North Sea basins, whereas the Oligocene–Quaternary subsidence is connected to the West European rift evolution. The distribution of the inverted provinces also shows that the Early Paleocene inversion (Laramide phase) has affected the whole European crust, whereas the Late Eocene inversion was restricted to the southern North Sea basins and the Channel area. Finally, comparison of these deformations in the European crust with the evolution of the Alpine chain suggests that the formation of the Alps has controlled the evolution of the European crust since the beginning of the Cenozoic

Анализ методик повышения эффективности эксплуатационного фонда скважин

В процессе исследования проводился анализ применимости зарезки бокового ствола как метод оптимизации разработки участка месторождения, а также сделаны выводы об эффективности применения этого метода на К*** месторождении. Рассмотрено оборудование и технологии для борьбы с негативным воздействием от: асфальто-смоло-парафиновых отложений, отложений неорганических солей, образования высоковязких эмульсий, коррозия скважинного оборудования и влияния механических примесей. А также технологии применяемые на последних стадиях разработки месторождения.In the course of the study, the applicability of sidetracking was analyzed as a method for optimizing the development of a section of the deposit, and conclusions were drawn about the effectiveness of this method at the K *** field. The equipment and technologies for combating negative impact from asphalt-tar-paraffin deposits, deposits of inorganic salts, formation of high-viscosity emulsions, corrosion of downhole equipment and influence of mechanical impurities are considered. And also technologies used in the last stages of field development