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Establishing method for three-dimensional Q body of shallow, medium and deep layers based on multi-information joint constraint

A construction method and multi-information technology, which is applied in the field of shallow, middle and deep 3D Q-body construction constrained by multi-information joint constraints, can solve problems such as low precision, lack of multi-type information constraints, poor stability, etc.

Active Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited data information used in conventional Q value estimation methods and the lack of effective multi-type information constraints, the accuracy and stability of Q value calculation are not high, and the calculated near-surface Q value and mid-deep Q value are separated. Shallow, medium and deep three-dimensional Q-body construction technology without including near-surface factors

Method used

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  • Establishing method for three-dimensional Q body of shallow, medium and deep layers based on multi-information joint constraint
  • Establishing method for three-dimensional Q body of shallow, medium and deep layers based on multi-information joint constraint
  • Establishing method for three-dimensional Q body of shallow, medium and deep layers based on multi-information joint constraint

Examples

Experimental program
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Embodiment 1

[0030] Example 1. A shallow-middle-depth three-dimensional Q-body establishment method constrained by multiple information joints, the method comprising:

[0031] (1) Use low-level logging data such as micro-logging and small refraction to obtain the velocity value and Q value of the low-speed zone at the position of the measurement point, and constrain it through the actual measurement data of the surface Q value, so as to obtain accurate and reliable measurement points For the Q value at the position, the shallow layer mainly refers to the near-surface strata above the high-speed top interface, usually 500-1000m above the strata. Due to the reason of the 3D seismic observation system, the seismic data cannot effectively obtain the seismic information near the surface. The surface strata mainly have the characteristics of loose structure, low velocity value, and rapid vertical and horizontal change of velocity value; on the basis of obtaining the velocity value and Q value at...

Embodiment 2

[0039] Example 2. A shallow-middle-depth three-dimensional Q-body establishment method constrained by multiple information joints, the method comprising:

[0040] (1) Collect single-well micro-logging data, double-well micro-logging data, small refraction data, surface Q value measurement data, lithology coring data, lithology detection data, 3D seismic data, VSP seismic data and cross-well seismic data Data and other types of data provide basic data and constraint information for the subsequent establishment of 3D Q volumes. The more types of data collected, the better the accuracy of the method is. The shallow, middle and deep 3D Q volumes established by multi-information joint constraints are more accurate and reliable.

[0041] (2) Using low-level logging data such as single-well micro-logging, double-well micro-logging, small refraction, lithology coring, lithology detection, etc., to obtain the velocity value of the low-speed zone at the position of the measurement point...

Embodiment 3

[0049] Example 3. Such as figure 1 as shown, figure 1 It is a flow chart of the method for building a shallow-middle-depth three-dimensional Q-body constrained by multi-information joint constraints of the present invention.

[0050] In step 1, first import the low-level data such as single-well micro-logging, double-well micro-logging, small refraction data, etc., and obtain the low-speed-down zone velocity value at the position of the measurement point, the low-speed-down zone In the two-dimensional high-precision time-frequency domain of the low-measurement data, under the dual constraints of the two-dimensional signal-to-noise ratio spectrum and the two-dimensional purity spectrum, the Q at the position of the measurement point is obtained by calculating the two-dimensional time-spectrum difference value.

[0051] In step 2, with the measured data of the surface Q value as the constraint condition, the Q value at the position of the measurement point calculated in step ...

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Abstract

The invention discloses an establishing method for a three-dimensional Q body of shallow, medium and deep layers based on multi-information joint constraint. The method comprises the following steps: constraining through surface layer Q value measured data, and establishing a relation curve of a Q value and a speed value on the position of a measurement point; acquiring a shallow three-dimensional speed model through high-precision constraint chromatography inversion under the constraint of the speed value on the position of the measurement point; utilizing the shallow three-dimensional speed model and the relation curve of the Q value and the speed value on the position of the measurement point to acquire a three-dimensional Q body of a shallow layer in a depth domain; utilizing seismic data to establish a three-dimensional speed model of medium and deep layers; getting the three-dimensional Q body of medium and deep layers under the constraint of the three-dimensional speed model; and performing time depth or depth time conversion, converting the three-dimensional Q body of the shallow layer and the three-dimensional Q body of the medium and deep layers to a domain, utilizing a sine cosine matching constraint three-dimensional fusion technique to effectively fuse the three-dimensional Q body of the shallow layer with the three-dimensional Q body of the medium and deep layers, and establishing a near-surface factor-containing three-dimensional Q body of the shallow, medium and deep layers. According to the invention, the problem of splitting of the Q body of the shallow layer and the Q body of the medium and deep layers can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of exploration and development of oil and gas fields, in particular to a method for establishing a three-dimensional Q-body in shallow, middle and deep layers under joint constraints of multiple information. Background technique [0002] Seismic waves propagate in the formation medium. Since the subsurface medium is an incomplete elastic medium, the energy and frequency of the seismic wave will be attenuated, including: formation medium extrinsic attenuation, such as spherical diffusion, reflection and transmission loss, converted wave, interlayer multiple wave reflection etc., and the inherent formation attenuation. Among them: the inherent attenuation of the formation is closely related to the internal structure characteristics of the formation, the properties of fluids, porosity, permeability, saturation and other properties. With the study of seismic wave absorption and attenuation theory and its develo...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/302G01V2210/6169G01V2210/64G01V2210/66
Inventor 刁瑞尚新民芮拥军李继光冯玉苹韩站一崔庆辉李强陈新荣揭景荣
Owner CHINA PETROLEUM & CHEM CORP
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