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CN106094037B - A kind of modification method of γ-γ density log distortion curves - Google Patents

A kind of modification method of γ-γ density log distortion curves Download PDF

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CN106094037B
CN106094037B CN201610424533.1A CN201610424533A CN106094037B CN 106094037 B CN106094037 B CN 106094037B CN 201610424533 A CN201610424533 A CN 201610424533A CN 106094037 B CN106094037 B CN 106094037B
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CN106094037A (en
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陈霜
何英
彭云彪
李强
丁忙生
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
    • G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
    • G01V1/48—Processing data
    • G01V1/50—Analysing data
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

The invention belongs to Nuclear Physics research and application field, and in particular to a kind of modification method of γ-γ density log distortion curves；The present invention is to provide a kind of in γ-γ density log data to arrange stages, eliminates because of the modification method of γ-γ density curves distortion caused by rock stratum radiation sexual factor.Including：Step 1, choose Corrected Depth section；Step 2, calculate rock stratum skeletal density value；Step 3, calculate average correction factor value；Step 4, calculate Corrected Depth section stratum density and draw γ-γ density curves after amendment；The present invention solves the problems, such as that curve is in the fluctuation of uranium enrichment interval before correcting, accurate acoustic impedance data can be provided for seismic prospecting and can effectively supervise the quality of γ-γ density logs simultaneously, the γ-γ density log distortion curves that the also equally applicable reaming of the modification method, collapse hole section influence.

Description

A kind of modification method of γ-γ density log distortion curves
Technical field
The invention belongs to Nuclear Physics research and application field, is that nuclear logging is made because of rock stratum radiation sexual factor interference The information of collection is distorted a kind of method being modified.
Background technology
γ-γ density log technologies are the expansions of Nuclear Physics research and application field, and it is mainly by wellhole Artificial radionuclide and rock stratum produce compton effect,scattering to obtain down-hole formation density information and technical parameter.
It was found from the effect of gamma-rays and material, when energy of γ ray is between 0.25MeV to 2.5MeV, in light member In plain medium, full attenuation coefficient (μ) may be characterized as
μ≈μK≈0.5σeNρ………………………………(1)
In formula, μK- compton attenuation coefficient；σeScattering section of-the gamma-rays to each electronics；N-A Fojiadeluochang Number；The density of ρ-working substance.(1) formula illustrates, full attenuation coefficient when gamma-rays acts on material depends primarily on Compton Attenuation coefficient, and it is directly proportional to the rock density that gamma-rays is passed through, here it is the theoretical foundation of radioactivity γ-γ logging.
Point-like radioactive source in the medium of the homogeneous isotropism of infinite space, its source strength are constant and without other radiation In the presence of source, then the spatial of its γ quantum can approx be thought to observe diffusion theory, its distribution situation, can use diffused sheet Journey (summary) expression, the solution of diffusion equation
In formula, γ quantum density of the ψ-space from point source r distant places；Q-source strength；C-the light velocity；R-radioactive source is to counting tube Distance (source away from).To the local derviation equation solution of (2) formula：
1. whenWhen,ψ is directly proportional to ρ
2. whenWhen,ψ is inversely proportional with ρ
γ-γ density inserting tubes used in geologic prospect well logging are to be received using 2. designed source away from (r), i.e. instrument γ photon densities (ψ) be inversely proportional with rock density (ρ), therefore, this mean that instrument receive γ photon densities increase It is exactly the reduction of rock density.So when inserting tube is by uranium enrichment interval, instrument have received additional to be dissipated through rock Compton A large amount of γ photons caused by penetrating, so as to cause the reduction of rock density measured value, on well logging result map, γ-γ density curves Show that the tracing pattern in specular, γ-γ density curves of this distortion have in practical application with γ-ray logging curve Following defect and deficiency：
1st, in terms of differentiating lithology.All there is an equivalent sex chromosome mosaicism in geophysical prospecting method, identical (or the phase of physical property in distinguishing Lithology Closely) but lithology it is different be its main cause.For example, there is a silt particle section, it is quantitative that comprehensive logging system only has (or being only capable of carrying out) When γ-ray logging and γ-γ density logs, three lateral resistivity show that one section of resistance is 40~45 Ω M, thickness 3m electric layers Section, meanwhile, quantitative gamma curve is also displayed as uranium enrichment form；γ-γ density curves show that with quantitative gamma-ray log curve be in mirror image Symmetrical tracing pattern (distortion curve).It is the electrical spy that 40~45 Ω M should be glutenite to think to universal experience apparent resistivity Sign, but calcareous packsand is shown in rock core.The reason for causing erroneous judgement is that Hypothesis of Single Curve Build Up has equivalence.If γ-γ density Curve is not distorted and density value is in 2.30g/cm3During the above, it is unchallenged to be judged to calcareous sandstone.Speculated with this, such as Fruit has the big uranium enriched layer of some sections of thickness in drilling flatly when, γ-γ density curves auxiliary differentiates that the effect of lithology will greatly drop It is low.
2nd, in terms of determining oozing property of formation pore.Although what γ-γ density logs measured is the density of rock stratum, it embodies Be rock stratum porosity：
In formula, φ-rock porosity, %；ρ-rock density, g/cm3；ρmaThe skeletal density of-rock, takes 2.68g/ cm3；ρfThe density of fluid, takes 1.00g/cm in-hole when saturated aqueous3.It is most important in Adjustable apex is reconnoitred Seek to understand the permeability of uranium ore layer, and infiltrative main indexes are exactly porosity.γ-γ density curves Distortion curve after being disturbed by uranium ore layer is clearly unhelpful to judging uranium ore layer permeability.It can not allow mineral deposit builder first Time understands the infiltration implementations of uranium ore layer.
3rd, Adjustable apex has reconnoitred the detailed survey stage, understand the ore deposit amount parameters such as the density of uranium ore layer and humidity into Top priority.The method carried out at present is exactly the sampling of the real-time ore deposit heart, in the wild under the conditions of, this method that wastes time and energy is difficult The density of ore and moisture measurement is accurate, because the rock retentiveness of good penetrability is poor, hole after the ore deposit heart takes out from drilling In contained water will partly lose, cause humidity be difficult survey it is accurate.If γ-γ density curves are not disturbed and understand ore deposit If the aqueous saturated conditions of the heart, by the ore dry density and γ-γ density values measured, you can the humidity of ore is tried to achieve, to The error of actual measurement humidity is checked, and is reasonably corrected, but disturbed γ-γ density curves lose reference standard.
Therefore, the interference of uranium ore layer, which causes γ-γ density logs curve to produce the caused inconvenience of distortion and help, makes people A kind of method of amendment is looked for, i.e., with reference to the Gardner empirical equations quoted in seismic data FORWARD AND INVERSE PROBLEMS, γ-γ density Well logging and acoustic logging connect, to eliminate because of the amendment side of γ-γ density curves distortion caused by rock stratum radiation sexual factor Method.
The content of the invention
Present invention solves the technical problem that being to provide a kind of in γ-γ density log data to arrange stages, eliminate because of rock stratum Radiate the modification method of γ-γ density curves distortion caused by sexual factor.
What the present invention was realized in：
A kind of modification method of γ-γ density log distortion curves, including：
Step 1, choose Corrected Depth section；
Step 2, calculate rock stratum skeletal density value；
Step 3, calculate average correction factor value；
Step 4, calculate Corrected Depth section stratum density and draw γ-γ density curves after amendment.
A kind of modification method of γ-γ density log distortion curves as described above, it is characterised in that：
Step 1, choose Corrected Depth section：Respectively take a γ-γ close in the γ-γ density curve peak values both sides of distortion Angle value ρ1And ρ2, and by the γ-γ density values ρ of selection1And ρ2Corresponding depth segment is defined as correcting in quantitative gamma curve Depth segment.
Step 2, calculate rock stratum skeletal density value ρma：It is close that γ-γ in Corrected Depth section are chosen on interval transit time curve Angle value ρ1And ρ2The interval transit time Δ t of corresponding acoustic logging measurement1, Δ t2, interval transit time Δ t is substituted into formula (6) and calculated Spread speed ν of the upper end sound wave (compressional wave) in rockp1With spread speed ν of the lower end sound wave (compressional wave) in rockp2：
In formula, the interval transit time of Δ t-acoustic logging measurement, μ s/m；νpThe propagation speed of-sound wave (compressional wave) in rock Degree, m/s；
The ν that will be calculated again according to formula (6)p1And νp2Substitute into Gardner empirical equations (5)
In formula (5), ρma- rock stratum skeletal density, g/cm3；Upper end rock stratum skeletal density value is calculated by formula (5) ρma1With lower end rock stratum skeletal density value ρma2。
Step 3, calculate average correction factor value：
By γ-γ density values ρ1、ρ2With upper end rock stratum skeletal density value ρma1, lower end rock stratum skeletal density value ρma2It is brought into Correction factor (the K of Corrected Depth section upper and lower end is asked in formula (7)1、K2) and average correction factor value (K).
Step 4, calculate Corrected Depth section stratum density and draw γ-γ density curves after amendment：
Average adjusted coefficient K is multiplied by the rock stratum skeletal density value ρ of Corrected Depth section each pointmaObtain Corrected Depth section Stratum density, and revised γ-γ density curves are drawn out according to the stratum density of Corrected Depth section.
The beneficial effects of the invention are as follows：
By revised γ-γ density curves solve amendment before curve uranium enrichment interval fluctuation and Outside three foregoing problems, also have the following advantages：
(1) accurate acoustic impedance data can be provided for seismic prospecting.Acoustic impedance is stratum density and sound wave (compressional wave) speed The product of degree.Played a very important role in seismic data inverting, the fluid that it can distinguish the lithology on stratum and be included Composition.
(2) quality of γ-γ density logs can effectively be supervised.From formula (4), stratum density is equal to rock stratum The density sum of fluid in skeletal density and rock stratum hole, i.e. rock stratum skeletal density is less than stratum density.In mud-sand section On, if γ-γ density values are less than the rock stratum skeletal density value that formula (5) calculates, illustrate that density inserting tube or calibration occur Failure or problem, accordingly, it effectively can check and evaluate comprehensive logging quality.
(3) γ-γ density log distortion curves that the equally applicable reaming of the modification method, collapse hole section influence.
Brief description of the drawings
Fig. 1 is the modification method flow chart of γ-γ density log distortion curves；
Embodiment
The technology of the present invention is described further below：
A kind of modification method of γ-γ density log distortion curves, specific modification method are as follows：
Step 1, choose Corrected Depth section：Respectively take a γ-γ close in the γ-γ density curve peak values both sides of distortion Angle value ρ1And ρ2, and by the γ-γ density values ρ of selection1And ρ2Corresponding depth segment is defined as correcting in quantitative gamma curve Depth segment；
Step 2, calculate rock stratum skeletal density value ρma：It is close that γ-γ in Corrected Depth section are chosen on interval transit time curve Angle value ρ1And ρ2The interval transit time Δ t of corresponding acoustic logging measurement1, Δ t2, interval transit time Δ t is substituted into formula (6) and calculated Spread speed ν of the upper end sound wave (compressional wave) in rockp1With spread speed ν of the lower end sound wave (compressional wave) in rockp2：
In formula, the interval transit time of Δ t-acoustic logging measurement, μ s/m；νpThe propagation speed of-sound wave (compressional wave) in rock Degree, m/s；
The ν that will be calculated again according to formula (6)p1And νp2Substitute into Gardner empirical equations (5)
In formula (5), ρma- rock stratum skeletal density, g/cm3；Upper end rock stratum skeletal density value is calculated by formula (5) ρma1With lower end rock stratum skeletal density value ρma2。
Step 3, calculate average correction factor value：
By γ-γ density values ρ1、ρ2With upper end rock stratum skeletal density value ρma1, lower end rock stratum skeletal density value ρma2It is brought into Correction factor (the K of Corrected Depth section upper and lower end is asked in formula (7)1、K2) and average correction factor value (K)：
Step 4, calculate Corrected Depth section stratum density and draw γ-γ density curves after amendment：
Average adjusted coefficient K is multiplied by the rock stratum skeletal density value ρ of Corrected Depth section each pointmaCorrected Depth section can be obtained Stratum density, and revised γ-γ density curves are drawn out according to the stratum density of Corrected Depth section.
It is because often causing other end amendment with the correction factor at single end that average correction factor is used in the present invention Stratum density value it is inconsistent in interface numerical value, cause curve to be contacted in " cliff of displacement " formula, by the correction factor at both ends it is average after This error can be reduced, make revised γ-γ density curves more harmonious, smooth in interface with normal density curve It is smooth.

Claims (4)

  1. A kind of 1. modification method of γ-γ density log distortion curves, it is characterised in that including：
    Step 1, choose Corrected Depth section；
    Step 2, calculate rock stratum skeletal density value；
    Step 3, calculate average correction factor value；By γ-γ density values ρ1、ρ2With upper end rock stratum skeletal density value ρma1, lower end Rock stratum skeletal density value ρma2It is brought into the adjusted coefficient K that Corrected Depth section upper and lower end is asked in formula (7)1、K2And average amendment Coefficient value K；
    <mrow> <msub> <mi>K</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>&amp;rho;</mi> <mn>1</mn> </msub> <msub> <mi>&amp;rho;</mi> <mrow> <mi>m</mi> <mi>a</mi> <mn>1</mn> </mrow> </msub> </mfrac> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>K</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>&amp;rho;</mi> <mn>2</mn> </msub> <msub> <mi>&amp;rho;</mi> <mrow> <mi>m</mi> <mi>a</mi> <mn>2</mn> </mrow> </msub> </mfrac> <mo>;</mo> </mrow>
    <mrow> <mi>K</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>K</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>K</mi> <mn>2</mn> </msub> </mrow> <mn>2</mn> </mfrac> <mn>...</mn> <mrow> <mo>(</mo> <mn>7</mn> <mo>)</mo> </mrow> <mo>;</mo> </mrow>
    The average correction factor is Corrected Depth section upper end adjusted coefficient K1With lower end adjusted coefficient K2Average value, i.e. K；
    Step 4, calculate Corrected Depth section stratum density and draw γ-γ density curves after amendment.
  2. A kind of 2. modification method of γ-γ density log distortion curves according to claim 1, it is characterised in that：
    Step 1, choose Corrected Depth section：A γ-γ density values ρ is respectively taken in the γ-γ density curve peak values both sides of distortion1 And ρ2, and by the γ-γ density values ρ of selection1And ρ2Corresponding depth segment is defined as Corrected Depth section in quantitative gamma curve.
  3. A kind of 3. modification method of γ-γ density log distortion curves according to claim 2, it is characterised in that：
    Step 2, calculate rock stratum skeletal density value ρma：γ-γ density values in Corrected Depth section are chosen on interval transit time curve ρ1And ρ2The interval transit time Δ t of corresponding acoustic logging measurement1, Δ t2, interval transit time Δ t is substituted into formula (6) and calculates upper end Spread speed ν of the sound wave in rockp1With spread speed ν of the lower end sound wave in rockp2：
    <mrow> <msub> <mi>v</mi> <mi>P</mi> </msub> <mo>=</mo> <mfrac> <msup> <mn>10</mn> <mn>6</mn> </msup> <mrow> <mi>&amp;Delta;</mi> <mi>t</mi> </mrow> </mfrac> <mn>...</mn> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> </mrow>
    In formula, the interval transit time of Δ t-acoustic logging measurement, μ s/m；νpSpread speed of-the sound wave in rock, m/s；
    The ν that will be calculated again according to formula (6)p1And νp2Substitute into Gardner empirical equations (5)
    <mrow> <msub> <mi>&amp;rho;</mi> <mrow> <mi>m</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <mn>0.26</mn> <msubsup> <mi>v</mi> <mi>p</mi> <mn>0.25</mn> </msubsup> <mn>...</mn> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow>
    In formula (5), ρma- rock stratum skeletal density, g/cm3；Upper end rock stratum skeletal density value ρ is calculated by formula (5)ma1With Lower end rock stratum skeletal density value ρma2。
  4. A kind of 4. modification method of γ-γ density log distortion curves according to claim 1, it is characterised in that：
    Step 4, calculate Corrected Depth section stratum density and draw γ-γ density curves after amendment：
    Average adjusted coefficient K is multiplied by the rock stratum skeletal density value ρ of Corrected Depth section each pointmaObtain the rock stratum of Corrected Depth section Density, and revised γ-γ density curves are drawn out according to the stratum density of Corrected Depth section.
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CN106990444A (en) * 2017-03-10 2017-07-28 核工业二六大队 A kind of method using the natural gamma ray logging material computation radiation dose rate that drills
CN112230263A (en) * 2020-09-04 2021-01-15 核工业二〇八大队 Geological comprehensive investigation and evaluation method for radioactive environment of underground coal mining
CN113356833B (en) * 2021-07-14 2023-07-18 中国石油天然气股份有限公司 Borehole environment correction method for density logging

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