Seismic inversion system and seismic inversion method controlled by geologic facies

Abstract

The invention provides a seismic inversion system and a seismic inversion method controlled by geologic facies. The seismic inversion system and the seismic inversion method controlled by the geologic facies comprises a geologic facies establishing module which establishes the geologic facies on a destination layer of a well point position, a seismic facies establishing module which establishes a seismic facies on a plane of the destination layer, a geologic facies constraint establishing module which establishes constraint to the geologic facies, a stochastic inversion module which chooses the number of constraint wells and conducts stochastic inversion controlled by the geologic facies, an analysis module which analyzes inversion data volume and further subdivides the geologic facies, and an output module which iterates repeatedly so as to obtain and output the three-dimensional inversion data volume. The seismic inversion system and the seismic inversion method controlled by the geologic facies solves the problem that due to the fact that geological sedimentary background and regularity in an inversion work area are not considered by the existing inversion method, and inversion results are often horizontally different from geological sedimentary regularity cognition. The seismic inversion system and the seismic inversion method controlled by the geologic facies has the advantages of being capable of accurately depicting oil deposit on the basis of control of the geologic facies.

Description

technical field [0001] The invention relates to the field of reservoir prediction for petroleum exploration and development, in particular to a geological facies-controlled seismic inversion system and seismic inversion method. Background technique [0002] Seismic inversion is the main method and means for reservoir lateral prediction in petroleum exploration and development. Generally, seismic inversion can be divided into two categories: pre-stack inversion and post-stack inversion: pre-stack inversion is mainly AVO inversion; post-stack inversion is mainly wave impedance inversion and the inversion of log curves derived from it . The invention belongs to the category of post-stack inversion. At present, there are four types of post-stack inversions used at home and abroad: direct seismic inversion, seismic inversion under logging control, logging interpolation and extrapolation under seismic control, and combined logging-seismic inversion. Seismic direct inversion is ...

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Problems solved by technology

However, since these post-stack inversion methods do not take into account the background and laws of geological deposition in the inversion work area, the inversion results are often different from the understanding of geological deposition laws in the lateral direction. Therefore, we have invented a method based on logging-seismic - A new post-stack inversion method for geological facies, which solves the above problems

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