Logging curve reconstruction method

A technology of well logging curves and curves, which is applied in the direction of seismology, measuring devices, and geophysical measurements for well logging records, and can solve problems such as poor quality of curves, great influence of density curves on boreholes, and difficulty in obtaining acoustic curves.

Inactive Publication Date: 2018-05-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0010] The above methods all have their pertinence and applicable conditions. For example, the Gardner formula requires high-quality density curves. However, the density curves are often affected by the wellbore and the quality of the curves is poor. Therefore, it is generally difficult to obtain high-quality acoustic curves; The Faust formula of resistivity to convert the acoustic curve has limitations for carbonate rocks

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the drawings.

[0047] The specific method of logging curve reconstruction according to the present invention includes the following steps

[0048] ① Preparation of basic data. The required well curve includes: longitudinal wave velocity, density, gamma, shale content, total porosity, and water saturation.

[0049] ②Logging curve correction, curve standardization and abnormal value elimination.

[0050] Due to the influence of logging tools and formation factors, it is first necessary to correct the acoustic wave, density and gamma curve to reduce its influence on the reservoir inversion results in the later stage. In the severely collapsed section of the well diameter, the natural gamma values ​​of sand and mudstone are similar. First, the gamma curve needs to be corrected, and then the acoustic time difference and density need to be corrected. At the same time, the logging curve needs to be standardized...

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Abstract

A logging curve reconstruction method includes the following steps: firstly, preparing basic data of a logging curve; secondly, rectifying the logging curve, conducting curve standardization and removing abnormal values; thirdly, utilizing a moving smoothing method to conduct high and low frequency separation on the curve; fourthly, carrying out curve high frequency fitting; fifthly, adding the high frequency curve in the fourth step and curve wave low frequency information in the third step together to form a new curve; sixthly, carrying out cross analysis on the curves obtained in the thirdstep, the fourth step and the fifth step; and seventhly, carrying out inversion on wave impedance. No human factor intervention exists during the whole process, no prerequisites are needed, and the method is widely applicable. The method provides explanation workers a universally applicable curve reconstruction technology.

Description

Technical field [0001] The invention relates to a logging curve reconstruction method applied in the field of oil and gas geophysics, in particular to a method for high-frequency fitting of acoustic curves and gamma curves, and finally fusion of low-frequency information of acoustic waves to reconstruct pseudo-acoustic curves. Background technique [0002] How to make full use of various logging curve information and improve the resolution of seismic data inversion has always been the direction of oil and gas exploration and development work. For a long time, model-based broadband constrained inversion methods are all based on convolution models. The initial model is wave impedance. Therefore, acoustic logging curves are used for seismic geological horizon calibration and wave impedance inversion. However, in many cases, due to the influence of formation factors and measurement accuracy, the impedance often cannot reflect the difference between the reservoir and the surrounding r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/50
CPCG01V1/50G01V2210/6169G01V2210/624
Inventor 马永强柯兰梅杨江峰朱博华胡玮
Owner CHINA PETROLEUM & CHEM CORP
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