Method using wavelet transformation to calculate formation pore pressure
A technology of formation pore pressure and wavelet transform, applied in the field of petroleum exploration, can solve the problems of obtaining a large number of on-site cores and uncertain accuracy, and achieve the effect of preventing complex downhole accidents
Inactive Publication Date: 2013-05-08
CHINA UNIV OF PETROLEUM (BEIJING) +1
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There are certain limitations in the application of these two types of methods. The first type of method is not suitable for carbonate rock formations; the second type of method requires a large number of tests to obtain rock mechanical parameters, the accuracy is uncertain, and there are certain difficulties in obtaining a large number of field cores
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[0027] The present invention provides a method and system for repetitive circuit simulation. The following description will enable any person skilled in the art to utilize the present invention. The descriptions provided in the specific embodiments and applications are examples only. Various extensions and combinations of the embodiments described herein will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention . Thus, the present invention is not limited to the embodiments shown, but the present invention covers the widest scope consistent with the principles and features shown herein.
[0028] The detailed description below is presented in the form of flow diagrams, logical modules and other symbolic manipulation representations that can be executed on a computer system. A program, computer-implemented step, logic block, procedure...
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The invention relates to the technical field of oil exploration, in particular to a method using wavelet transformation to calculate formation pore pressure. The method using wavelet transformation to calculate the formation pore pressure includes the following steps: a. confirming lithology of each layer in strata by making use of geological data, b. obtaining sound wave velocity characteristic data series according to well logging information, c. decomposing the sound wave velocity characteristic data series by using the wavelet transformation method based on Biot theory and obtaining corresponding detail value data series and background data series, d. adding the corresponding detail value data series and obtaining pore fluid sound wave velocity data series, e. establishing a formation pore pressure model by using relation between the pore fluid sound wave velocity and the real-measured formation pore pressure and on the basis of difference theory, f. bring the pore fluid sound wave velocity data series into the formation pore pressure model, and obtaining formation pore pressure section through calculating. The method using wavelet transformation to calculate the formation pore pressure has the advantage that the formation pore pressure can be accurately calculated.
Description
technical field [0001] The invention relates to the technical field of petroleum exploration, in particular, the invention relates to a method for calculating formation pore pressure by using wavelet transform. Background technique [0002] Formation pore pressure, especially the existence of abnormal formation pore pressure, brings many technical difficulties to oil exploration, drilling and development. Accurate prediction of formation pore pressure is very important, providing basic data for wellbore structure design, determination of drilling fluid density, protection of oil and gas layers, and improvement of drilling success rate. [0003] At present, there are two main methods for predicting formation pore pressure: one is based on the mechanism of undercompaction, using logging data to establish a normal trend line, and qualitatively judging whether there is abnormal formation pore pressure according to whether the logging curve deviates from the normal trend line; T...
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Login to View More IPC IPC(8): E21B49/00E21B47/06
Inventor 金衍余夫陈勉卢运虎侯冰
Owner CHINA UNIV OF PETROLEUM (BEIJING)