최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0566611 (1983-12-29) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 286 인용 특허 : 3 |
A method of correlating a core sample with its original position in a borehole. The borehole is logged to determine the bulk density of the formation surrounding the borehole. The core sample is scanned with a computerized axial tomographic scanner (CAT) to determine the attenuation coefficients at
A method of correlating a core sample with its original position in a borehole. The borehole is logged to determine the bulk density of the formation surrounding the borehole. The core sample is scanned with a computerized axial tomographic scanner (CAT) to determine the attenuation coefficients at a plurality of points in a plurality of cross sections along the core sample. The bulk density log is then compared with the attenuation coefficients to determine the position to which the core sample correlates in the borehole. Alternatively, the borehole can be logged to determine the photoelectric absorption of the formation surrounding the borehole, and this log can be compared with data derived from scanning the core sample with a CAT at two different energy levels.
1. A method of correlating a core sample with its original position in a borehole, said method comprising the steps of: logging the borehole to determine the bulk density of the formation surrounding the borehole; scanning the core sample with a computerized axial tomographic scanner to determine th
1. A method of correlating a core sample with its original position in a borehole, said method comprising the steps of: logging the borehole to determine the bulk density of the formation surrounding the borehole; scanning the core sample with a computerized axial tomographic scanner to determine the attenuation coefficients at a plurality of points in a plurality of cross sections along said core sample; comparing the bulk density log determined in said logging step with the plurality of attenuation coefficients determined in said scanning step to determine the position to which said core sample correlates in said borehole. 2. A method as recited in claim 1, wherein said comparing step comprises determining the average attenuation coefficient for each cross section in said plurality of cross sections an interpolating between the average attenuation coefficients for adjacent cross sections in said plurality of cross sections to generate an interpolated-average attenuation coefficient function. 3. A method as recited in claim 2, wherein said comparing step comprises convolving the interpolated-average attenuation coefficient function with the response function of the logging tool used in said logging step to generate a convolved attenuation coefficient function. 4. A method as recited in claim 3, wherein said comparing step comprises determining the maximum of the cross correlation function of the values obtained in said logging step with the convolved attenuation coefficient function. 5. A method of correlating a core sample with its original position in a borehole, said method comprising the steps of: logging the borehole to determine the photoelectric absorption of the formation surrounding the borehole; scanning said core sample with a computerized axial tomographic scanner (CAT) at a first energy to determine the attenuation coefficients at a plurality of points in a plurality of cross sections along said core sample at said first energy; scanning said core sample with a CAT at a second energy to determine the attenuation coefficients at said plurality of points in said plurality of cross sections along said core sample at said second energy; using the attenuation coefficients determined for said core sample at said first and second energies for said plurality of points in said plurality of cross sections along said core sample to determine the effective atomic numbers for said plurality of points in said plurality of cross sections along said core sample; comparing the photoelectric absorption log determined in said logging step with the effective atomic numbers determined in said using step to determine the position to which said core sample correlates in said borehole. 6. A method as recited in claim 5, wherein said using step comprises determining the average effective atomic number for each cross section in said plurality of cross sections and interpolating between the average effective atomic numbers for adjacent cross sections in said plurality of cross sections to generate an interpolated-average effective atomic number function. 7. A method as recited in claim 6, wherein said comparing step comprises convolving the interpolated-average effective atomic number function with the response function of the logging tool used in said logging step to generate a convolved effective atomic number function. 8. A method as recited in claim 7, wherein said comparing step comprises determining the maximum of the cross correlation function of the values obtained in said logging step with the convolved effective atomic number function. 9. A method as recited in claim 8, further comprising the step of determining the portion of each cross section in said plurality of cross sections of the core sample that has been invaded drilling fluid and eliminating the portions of the cross sections that have been invaded by the drilling fluids from said step of determining the average effective atomic number for each cross section in said plurality of cross sections. 10. A method as recited in claim 8, wherein said steps of scanning said core sample at said first and second energies are performed with mean X-ray energies that are equal to the X-ray energies of the logging tool used in said logging step. 11. A method as recited in claim 5, wherein said scanning step is performed with a mean X-ray energy that is equal to the mean X-ray energy of the logging tool used in said logging step.
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