A Method for Identifying Subtle Lithologic Reservoirs in Thin Reservoirs

Abstract

The invention relates to a method for identifying thin-reservoir subtle lithologic oil and gas reservoir, belonging to the technical field of petroleum exploration and development. The method disclosed by the invention comprises the following steps: calculating a quality factor of the stratum, and performing secondary high-frequency compensation on the post-stack seismic data by utilizing inverse Q filtering according to the quality factor so as to acquire ideal seismic data; performing seismic response feature research on target stratum according to the ideal seismic data, clearing the reservoir waveform features, and making a seismic data skeleton section according to the waveform reflection characters on the top and bottom surfaces of the reservoir; and finely depicting surface distribution of a sand body on the basis of the seismic data skeleton section, determining the boundary of the sand body by utilizing seismic attribution analysis so as to determine the thin-reservoir subtle lithologic oil and gas reservoir. According to the method disclosed by the invention, proved by specific examples, the subtle lithologic oil and gas reservoir can be reliably identified, and the heating identification rate of the thin-reservoir subtle lithologic oil and gas reservoir is improved.

Description

technical field [0001] The invention relates to a method for identifying hidden lithology oil and gas reservoirs in thin reservoirs, belonging to the technical field of petroleum exploration and development. Background technique [0002] In oil and gas exploration, the exploration of subtle lithologic reservoirs is the inevitable result of the development process, especially for thin reservoir lithologic reservoirs, it is difficult to predict reservoirs. The quality of seismic data directly restricts reservoir prediction, and a series of processing methods must be adopted to obtain high-fidelity, high-resolution seismic data, and then appropriate interpretation methods and processes must be adopted to improve the identification effect of subtle lithologic reservoirs. [0003] The patent "Identification Method for Favorable Reservoir Areas Based on Paleo-Structural Hydrocarbon-Generation Period" (Application No.: 201310064704.0) proposes to find favorable reservoir areas by a...

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Problems solved by technology

The patent "A Method for Analyzing Architectural Structure of Meandering River Sand Body Reservoir Based on Evolution Process" (Application No.: 201410211934X) discloses a method for analyzing the architectural structure of meandering river sand body reservoir based on evolution process. Geological means to study the reservoir, not combined with seismic data for analysis

The patent "Method and Device for Predicting Sand Body Thickness Using Logging Constrained Wave Impedance Inversion" (application number: 2013103468502) proposes that logging constrained wave impedance inversion can improve the reliability of sand body thickness prediction in complex geological conditions. It is mainly to establish a model to predict the change of reservoir thickness between wells, which cannot further reflect the distribution of reservoirs on the plane

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