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Well logging method for rapidly determining content of biological silicon in graptolite facies heat shale

A bio-silicon and shale technology, applied in the field of shale gas exploration and development, can solve the problems of high cost, large limitations, and inability to fully exploit the information value of logging data, and achieve the effect of high speed and low cost

Active Publication Date: 2018-09-07
CHINA PETROCHEMICAL CORP +3
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Problems solved by technology

Measuring bio-silicon content in graptolitic hot shale with X-ray fluorescence large-scale instrument method is not suitable for rapid on-site measurement for mud logging, and the cost is high, and the information value of mud logging data cannot be fully exploited. Big

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  • Well logging method for rapidly determining content of biological silicon in graptolite facies heat shale
  • Well logging method for rapidly determining content of biological silicon in graptolite facies heat shale

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Embodiment Construction

[0020] The present invention will be described in detail below with reference to the accompanying drawings.

[0021] refer to figure 1 , the concrete steps of the present invention are:

[0022] 1) Obtain the TOC measurement data of the graptolitic hot shale in the well, the measurement unit of TOC is %; the source of TOC is the geochemical logging measurement data and the data calculated by using the lithology density logging data; This source data is preferred for mud logging measurement data.

[0023] 2) Obtain the SiO of the graptolitic hot shale in the well 2 Measured data, SiO 2 The unit of measurement is %. SiO 2 The source of element logging measurement data and element capture logging measurement data; this source data is preferred when there is element capture logging measurement data.

[0024] If the well does not have SiO of graptolitic hot shale 2 Measurement data, using the TOC measurement data of wells without graptolitic hot shale, the linear regression ...

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Abstract

The invention relates to a well logging method for rapidly determining the content of biological silicon in graptolite facies heat shale. The well logging method comprises the following steps: acquiring TOC (Total Organic Carbon) measured data of the well graptolite facies heat shale and acquiring SiO2 measured data of the well graptolite facies heat shale; selecting a data sample according to a depth corresponding relationship and drawing a TOC-SiO2 cross plot, wherein A and B are the slope of a regression straight line and the intercept on the Y axis; establishing a linear regression equation SiO2 being equal toA*TOC+B which takes TOC as an independent variable and SiO2 as a dependent variable; solving a correlation coefficient R by utilizing a least squares linear regression method; judging a correlation relationship between the independent variable TOC and two variables and directions by utilizing the R; when the R is greater than or equal to 0.7, characterizing positive correlation and entering the next step; when the R is less than 0.7, returning; calculating the content of Si_toc of the biological silicon by utilizing an equation Si_toc being equal to 0.47(SiO2-B) and outputting a result. The well logging method provided by the invention is applied to more than 120 wells and the error is less than 15 percent; the speed is rapid and the cost is low.

Description

technical field [0001] The invention belongs to the field of shale gas exploration and development, and in particular relates to a mud logging method for quickly determining the content of biological silicon in graptolite hot shale. Background technique [0002] In Fuling shale gas field and Weiyuan-Changning shale gas field in the middle and upper Yangtze region, the applicant discovered the graptolite hot shale at the bottom of the Silurian Longmaxi Formation-Ordovician Wufeng Formation. Shale gas has been successfully developed commercially. [0003] The common feature of the Fuling shale gas field and the Weiyuan-Changning shale gas field is that the shale of the target layer, the bottom of the Silurian Longmaxi Formation-Ordovician Wufeng Formation, is rich in marine organic matter, and the types and abundance of graptolite fossils are rich. It is black, with high natural gamma value, strong radioactivity, rich in biosilicon (organosilicon), and is a typical graptolite...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 廖勇石文睿冯爱国陈四平夏宁胡端义王兴志石元会陈志蓉赵红燕魏炜焦恩翠
Owner CHINA PETROCHEMICAL CORP
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