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Recognition method of seismic characteristics of mud-coated sand thin reservoirs

An identification method and technology for thin reservoirs, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve problems such as weak understanding of seismic characteristics, achieve intuitive understanding, reduce exploration risks, and improve the interpretation of seismic characteristics.

Active Publication Date: 2022-07-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0015] The invention proposes a method for identifying the seismic characteristics of sand-in-mud thin reservoirs, which solves the problem of relatively weak understanding of the seismic characteristics of sand-in-mud thin reservoirs in the prior art

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  • Recognition method of seismic characteristics of mud-coated sand thin reservoirs
  • Recognition method of seismic characteristics of mud-coated sand thin reservoirs
  • Recognition method of seismic characteristics of mud-coated sand thin reservoirs

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Embodiment Construction

[0067] The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0068] The method for identifying the seismic characteristics of a mud-coated sand type thin reservoir of the present invention comprises the following steps in turn:

[0069] Step 1: Perform spectrum analysis and synthetic seismic records based on known wells to obtain seismic wavelets of the target layer;

[0070] Step 1.1: Obtain a comprehensive profile of known wells such as figure 1 , and the spectrum of seismic data near the well can be obtained from the relevan...

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Abstract

The invention provides a method for identifying the seismic characteristics of a mud-coated sand type thin reservoir. The steps are as follows: obtaining the seismic wavelet of the target layer; calculating the apparent main period PAM; calculating the mudstone velocity Vm and the sandstone velocity Vs of the target layer; Whether the sandstone of the target layer is concentrated in half of the apparent main period; calculate the thickness range of the resonance strengthening area and the resonance weakening area; build a mud-coated sand geological model with gradually increasing sandstone thickness; divide the target layer into mudstone area, resonance strengthening area and Resonance weakening area; the model synthetic seismic record is obtained under the condition of given rake wavelet, and the reflection range of the resonance area is marked; compared with the geological model of mud-coated sand, the seismic waveform in the resonance area is divided into types, and different types of seismic waveforms and Relationship between amplitude and sand body development. The invention can better interpret the information on the mud-covered sand type seismic profile, is beneficial to use the information on the seismic profile to help interpretation, is favorable for the development of sand bodies, and reduces the exploration risk.

Description

technical field [0001] The invention relates to a method for identifying seismic characteristics of reservoirs, in particular to a method for identifying seismic characteristics of mud-coated sand thin reservoirs, and belongs to the technical field of geological exploration methods. Background technique [0002] In most of the basins in the world dominated by continental sand and mud deposits, with the deepening of oilfield exploration and development in the basins, the probability of discovering thick oil and gas reservoirs is getting smaller and smaller. The oil and gas reservoirs with thin reservoirs are mainly characterized by layers, and the discovery of such oil and gas reservoirs is far more difficult than that of thick reservoirs. In order to better discover such thin-layer oil and gas reservoirs, it is necessary to better identify the performance characteristics of such oil and gas reservoirs. Among many typical thin reservoir sand-mud combination types, mud-coated...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/301
Inventor 陈军鲍祥生裴然
Owner CHINA PETROLEUM & CHEM CORP
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