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A stratum radial resistivity continuous inversion method

A technology of resistivity and formation, applied in the direction of electrical digital data processing, instrumentation, calculation, etc., can solve problems such as inconsistency of formation invasion characteristics

Active Publication Date: 2019-06-14
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

At present, the formation invasion model constructed by 3-parameter or 5-parameter inversion used in the array lateral is borehole, invasion zone, and undisturbed formation, and the resistivity changes in steps, which is inconsistent with the actual formation invasion characteristics

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  • A stratum radial resistivity continuous inversion method
  • A stratum radial resistivity continuous inversion method
  • A stratum radial resistivity continuous inversion method

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Embodiment Construction

[0032] In order to make the purpose, technical solutions and advantages of the present invention clearer, the implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings. Taking the logging data of the array lateral tool as an example, the picture of the tool is as follows: figure 1 , electrode with A 0 The instrument is distributed symmetrically up and down the center. The instrument has 23 electrodes in total, 1 main transmitter electrode, 5 pairs of shielding electrodes, and 6 pairs of supervisory electrodes. There are 5 detection modes in total, and the logging curves of 5 detection depths are obtained.

[0033] 1) Since the drilling mud pressure is greater than the formation pressure, the mud invades the formation. The actual formation invasion model includes two types: low invasion and high invasion, such as figure 2 , where the abscissa is the invasion radius, and the ordinate is the formation resisti...

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Abstract

The invention discloses a stratum radial resistivity continuous inversion method, which comprises the following steps of 1) constructing a radial gradient stratum model on the basis of a quadratic fractal function according to the characteristics that invading stratum features show that two stable regions exist at two ends and asymptotic change exists between the two ends; 2) based on natural gamma and resistivity logging curves, performing automatic stratification on the stratum by combining wavelet transform multi-stage decomposition and Fourier transform; 3) for each layer, setting RAL1 = Rxo and RAL5 = Rt in combination with five logging curves in the lateral direction of the array, calculating initial values of parameters a and c by utilizing a formula (3), and determining an initialposition ri of an inflection point of a quadratic fractal function curve by calculating the difference of the five resistivity curves, thereby giving an initial value of a parameter b; and 4) throughapproximation iteration of a forward modeling calculation value and a measurement value of the radial gradient stratum model, solving the parameters a, b and c. The method provided by the invention utilizes the gradient stratum model to realize the stratum radial resistivity continuous inversion, and can obtain the resistivity of any position in the radial direction of the stratum.

Description

technical field [0001] The invention belongs to the field of petroleum logging interpretation, and in particular relates to a continuous inversion method for formation radial resistivity. Background technique [0002] Due to the influence of factors such as wellbore, mud invasion and surrounding rock, the electrical logging resistivity measurement value (apparent resistivity) is quite different from the true formation resistivity, and the apparent resistivity used to calculate oil and gas saturation has a large error . There are generally two ways to solve the problem of the difference between the apparent resistivity and the real resistivity: one is to correct the apparent resistivity through a calibration plate to eliminate environmental factors. The calibration plates that this method relies on are established by ideal models. The biggest problem is Single-factor superposition correction causes a large error and is rarely used at present; the second is to use the inversi...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 姜黎明陈涛贺飞岳爱忠卢春利曹景致郭英才
Owner BC P INC CHINA NAT PETROLEUM CORP
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