| 摘要 |
An improved method is provided for establishing the location and orientation of the boundaries surrounding a reservoir and creating an image thereof. A conventional well test is performed on a well, establishing measures of the well's pressure response as a function of the rate of pressure change in the reservoir over time. Conventional techniques may be used to determine measures of the radius of investigation. A plurality of radii of investigation are determined as a function of time. A calculated response for an infinite and radially extending well are the measured response are compared as a ratio. Variation of the ratio from unity is indicative of the presence of a boundary at that radius of investigation and the magnitude of its effect related to an angle-of-view. Each radius of investigation is deemed analogous to a ring. Reservoir encompassed by this ring is in communication with the well. This ring is interrupted along its circumference by an encounter with a boundary or boundaries, the arc length of such an interruption being equal to the angle-of-view. The remaining arc of the ring is rotated so that at least one of the arc's end-points coincides, or is fitted, with a known geologic feature. Should the same ring arc intersect another feature, the ring arc is cut to form a new arc end-point. The remaining arc is rotated so that its new end-point again coincides with a geologic feature. Once all the ring arcs for each radius of investigation are fitted, their collective end-points form an image of the periphery of the reservoir.
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