Seismic identification method and device for fault-karst reservoir connectivity

Abstract

The invention discloses a seismic identification method and device for fault-karst reservoir connectivity. The method includes: constructing an earthquake maximum likelihood body based on a three-dimensional seismic data volume; The likelihood body performs space carving to obtain the spatial outline of the fault-karst body; select the first point and the second point at the same altitude in the space of the fault-karst body to obtain the formation pressure at the first point and the formation pressure at the second point ; Comparing the formation pressure at the first point and the formation pressure at the second point, and judging whether the reservoir between the first point and the second point is connected according to the comparison result. The present invention utilizes three-dimensional seismic data volumes to construct seismic maximum likelihood volumes, calculates formation pressures at two points at the same altitude, and identifies reservoir connectivity based on the principle that formation pressures at the same depth in the same fracture-cavity unit are equal, solving the problem of no-well The problem of effective identification of reservoir connectivity in regional or out-of-well regions.

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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