A Method of Reconstructing Well Logging Curve

A technology of logging curves and curves, which is applied in the directions of measurement, earthwork drilling and production, boreholes/well components, etc., which can solve problems such as complex relations of formation petrophysical properties, stagnation, and difficulty in describing related characteristics, so as to increase applicability and improve Accuracy, the effect of meeting engineering needs

Active Publication Date: 2017-05-17
CNOOC ENERGY TECH & SERVICES
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Problems solved by technology

However, the application of this technology is still based on the multiple linear regression method. Due to the complex relationship between the physical properties of formation rocks, it is difficult to describe the correlation properties between them only by linear regression.

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  • A Method of Reconstructing Well Logging Curve
  • A Method of Reconstructing Well Logging Curve
  • A Method of Reconstructing Well Logging Curve

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Embodiment Construction

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0029] The embodiment of the present invention is based on the multiple linear regression technology, constructs the multiple nonlinear regression calculation model of the reconstructed logging curve, and establishes a set of method flow for optimizing the parent curve and the corresponding multiple regression model according to the principle of maximum correlation, and obtains A set of optimal schemes for curve reconstruction.

[0030] The embodiment of the present invention takes the Guantao Formation of M14 Well M14 in the Bohai Sea M work area as an example. The logging-while-drilling of this well has not been measured in this layer, and no acoustic time difference curve has been measured. In order to evaluate the formation pressure of the Guantao Formation in detail, the Re...

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Abstract

The invention discloses a method for reconstructing a logging curve, and relates to the technical field of exploration and development of petroleum and natural gas. The method comprises the steps of collecting general logging materials of a well adjacent to a target well; selecting a standard layer of a target curve; building a multi-regression model including linearity, index, logarithm and power function; acquiring a corresponding multi-regression equation; calculating the correlation between the target curve of the standard layer and other curves; selecting a base curve for reconstructing the target curve; selecting the optimal multi-regression model based on the selected base curve and according to the maximum correlation principle; deducing the corresponding multi-regression equation; substituting the regression constants, coefficients and the base curve value into the multi-regression equation at the well section suffering from deletion or distortion of the target curve, so as to finish the reconstruction of the target curve. According to the method, the logging curve can be quickly and accurately reconstructed; the operation is simple and convenient; the popularization is easily carried out; the field construction applies, and geological personnel can quick evaluate the stratum information.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for reconstructing logging curves. Background technique [0002] In the process of logging while drilling, the quality of the measured acoustic time difference is often unsatisfactory due to drilling tool vibration, eccentricity, cuttings collision, etc., so acoustic logging while drilling cannot be performed in most oil fields (especially production wells). Mass promotion. However, acoustic transit time curves play an extremely important role in reservoir evaluation operations such as reservoir identification, gas layer evaluation, fracture identification, and formation pressure monitoring, so the construction of acoustic transit time while drilling is particularly important. The method is mainly to use the wells with complete logging series in the work area to try to establish the mathematical relationship between the logging curves and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/00G06F17/50
CPCE21B47/00E21B49/00G06F30/20
Inventor 邓强谭伟雄王俊瑞张志虎秦磊
Owner CNOOC ENERGY TECH & SERVICES
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