A Correction Method of P-wave and S-wave Velocity in Shale Formation
A correction method and shear wave velocity technology, applied in seismology, earthwork drilling, seismic signal processing, etc., can solve the problems of large errors, many parameters, and difficulty in obtaining, etc., and achieve less parameters, high accuracy, and convenient later application Effect
Active Publication Date: 2021-01-05
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
[0005] The purpose of the present invention is to provide a correction method of compressional wave and shear wave velocity in the formation of a shale gas well deviated section, which has the advantages of high accuracy, convenient application in the later stage, and less required parameters, and overcomes the existing correction method based on theoretical calculation. The calculation requires many parameters and some of them are not easy to obtain, and there is a big error with the actual measured value.
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[0038]Model establishment:
[0039]The present invention takes a certain shale oil field in Fuling area as the research object, and studies the correction method of longitudinal wave and shear wave velocity in this shale formation, including the following steps:
[0040]Step 1: Collect geological data and logging data of the research block; the geological data includes lithology and layer group data, and the logging data includes formation dip, longitudinal wave time difference, shear wave time difference logging data;
[0041]Step 2: Collect representative downhole rock samples of the research block, according to different bedding angles(Definition: The angle between the axis of the standard cylindrical sample and the bedding surface is the bedding angle) Drill a standard cylindrical core sample, starting from 0°, and the angle with the bedding direction is equal to every 10° The sample is drilled in the group direction, a total of 10 groups of directional core drilling are performed, of wh...
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The invention provides a method for correcting the velocity of longitudinal waves and transverse waves in a shale formation. The method comprises the following steps of: firstly collecting data, drilling a core, and then calculating out the stratification line density of the core through gray-scale processing and binarization processing; performing indoor acoustic measurement on the core, establishing the relationship with onsite logging information, and finally, establishing a calculation model of a longitudinal wave correction coefficient K1 and a transverse wave correction coefficient K2 ofthe shale formation by using a longitudinal wave correction coefficient and a transverse wave correction coefficient of the core as dependent variables and the shale stratification angle and the stratification line density as independent variables. The correction method has the advantages of high accuracy, convenient later application, few required parameters and the like, and overcomes the defects of an existing correction method that the existing correction method is based on theoretical calculation, and requires lots of parameters during calculation, part of parameters are difficult to obtain, and a calculated value has a large error compared with an actual measured value.
Description
Technical field[0001]The invention belongs to the technical field of petroleum logging, and specifically relates to a method for correcting longitudinal wave and transverse wave velocity in shale formations.Background technique[0002]In petroleum logging, the sonic logging tool performs sonic measurement in parallel to the wellbore. When the wellbore trajectory is perpendicular to the strata, the wave velocity obtained in sonic logging is perpendicular to the formation, which can represent The wave velocity of the real formation; when the wellbore trajectory is at a certain dip angle to the strata, and the formation is an anisotropic medium, the wave speed obtained in sonic logging will not be perpendicular to the formation, and will also deviate from the wave speed of the real formation. When it exceeds 20°, as the inclination angle increases, the mudstone acoustic velocity obtained by logging increases significantly.[0003]For shale formations, sonic logging is not only affected by ...
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IPC IPC(8): G01V1/36G01V1/40E21B49/02
CPCE21B49/02G01V1/362G01V1/40G01V2210/52G01V2210/58
Inventor 熊健黄林林刘向君梁利喜李贤胜李玮
Owner SOUTHWEST PETROLEUM UNIV