Seismic identification method and device for connectivity of fault-dissolved body reservoir

Abstract

The invention discloses an earthquake identification method and device for the connectivity of a fault-dissolved body reservoir, and the method comprises the steps: building an earthquake maximum likelihood body based on a three-dimensional earthquake data volume; performing space engraving on the earthquake maximum likelihood body through the threshold value of the attribute of the earthquake maximum likelihood body to obtain the space contour of the fault-dissolved body; selecting a first point and a second point at the same altitude in the space of the fault-dissolved body, and obtaining the formation pressure at the first point and the formation pressure at the second point; comparing the formation pressure at the first point with the formation pressure at the second point, and judgingwhether the reservoir between the first point and the second point is connected or not according to a comparison result. According to the method, the earthquake maximum likelihood body is constructedby utilizing the three-dimensional earthquake data body, the formation pressures of the two points at the same altitude are calculated, reservoir connectivity identification is carried out based on the principle that the formation pressures at the same depth in the same fracture-cavity unit are equal, and the effective identification problem of reservoir connectivity in a well-free area or an area outside a well is solved.

Description

technical field [0001] The invention relates to the technical field of carbonate reservoir reserve prediction, in particular to a seismic identification method and device for fault-karst reservoir connectivity. Background technique [0002] The fault-karst body is a fractured zone of carbonate rock developed along the fault zone under the influence of multi-phase structural extrusion and tension. Multi-phase surface water infiltrates along the fault or local hydrothermal upwelling causes dissolution in the fractured zone. The fracture-cave system is simply understood as an aggregate of secondary dissolution pores, fractures, and fractures controlled by faults. Fault-karst bodies have strong heterogeneity, are distributed along the fault zone in the transverse direction, and are segmented, and distributed in a network shape in the longitudinal direction, with irregularities. [0003] In the process of realizing the present invention, it is found that the complexity of fault-...

AI Technical Summary

Problems solved by technology

[0011] The advantage of the conventional description method of reservoir connectivity above is that it can accurately describe the connectivity of interwell reservoirs and determine formation parameters, but the disadvantage is that the connectivity of reservoirs in areas without wells or areas outside wells cannot be evaluated.

At present, there is no effective method at home and abroad to identify the connectivity of reservoirs without wells or outside wells

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