摘要:
An apparatus for scanning pages of bound materials is disclosed. The apparatus includes a base with a platform configured to support bound materials laid open. A depressor with a complimentary surface is provided to depress pages of the bound material flat against the platform of the base. The depressor has a transparent portion allowing the pages of the bound material to be viewed therethrough. The depressor is removable from the base. A camera assembly is connected to and supported over the depressor. At least one camera attached to the camera assembly and aimed towards the transparent portion of the depressor. The camera is configured to capture a digital image of at least one page of the bound material through the transparent portion of the depressor when the depressor is placed over a bound material that is laid open in the platform of the base.
摘要:
Evolution of an hydrocarbon reservoir in the process of producing is carried out by co-analyzing the changes in the propagation times and seismic amplitudes of a seismic wavelet along propagation paths in the ground. A base survey of the reservoir is provided, with a set of seismic traces at a first time T associated to a first velocity field Vb; a monitor survey of the reservoir is provided, the monitor survey being taken at a second time T+ΔT, with a set of seismic traces associated to the same positions as in the base survey; the monitor survey is associated to a second velocity field Vm. For a set of points i in the base survey, one computes over the points of the set the sum S of a norm of the difference between the amplitude bi of the seismic trace in the base survey at each point i and the sum of the amplitude mi of the seismic trace at a time-corresponding point i′ in the monitor survey and the amplitude due to the reflectivity change local to the time-corresponding point i′ induced by the difference between the first velocity field Vb and the second velocity field Vm; the time-corresponding point i′ being shifted in time by a time-shift derived from the velocity changes along the propagation path from the surface to time-corresponding point i′. This sum is minimized to characterize the evolution of the hydrocarbon reservoir and derive the velocity changes from the base survey to the monitor survey.