Research On The Control System Of Oil Extraction Joint Station Based On PLC

The seismic data in Pre-Caspian Basin K block is vibroseis acquisition in area of complex surface with low signal to noise ratio, the weathering layer changes fast, the static problem is prominent; the original records have different kinds of noise, signal to noise ratio is low, especially in the deep data after 2 seconds and salt dome, the signal-to-noise ratio is even lower; the original data energy attenuates rapidly, especially in the area bellow salt dome; energy also changes in lateral direction the start sweep frequency of vibroseis is lOHz. In fact, the frequency of original record is above 15Hz, the loss of low frequency components below 15Hz is not conducive to improve imaging, Complex faults, salt dome, also challenged to the migration imaging.This paper is mainly studied based on the characteristics of the original data in the area, from the following aspects:(1) make full use of Upholes in the near surface data, tested a variety of static correction method to solve existing static problem in the work area, and combined different kinds of static correction and velocity analysis iterative to improve data quality;(2) based on its formation mechanism and characteristic of velocity & frequency different, using a high fidelity noise suppression technology to remove various noise, make full use of different software, using prestack joint noise attenuated method, choose effective fidelity prestack noise elimination methods to protect the signal information, improved the signal-to-noise ratio of the data;(3) vertical compensation technique is adopted to compensate the vertical energy attenuation, and the lateral energy adjustment technique is adopted to solve the lateral energy inconsistency;(4) using broadband processing technology to broaden the frequency band of the effective signal, and improve the consistency and resolution of seismic wavelet;(5) to establish an accurate and reasonable velocity field, in particular, to adjust the velocity model in and surrounding the salt dome, to improve the accuracy of the migration imaging, using complex structural imaging technology to ensure the accuracy and reliability of imaging of stack and migration. Build correct pre stack depth migration velocity model ensure the salt dome and other geological structures more better imaging.By study and deal with the various difficulties in processing technology, this paper worked out a set of data processing flow for pre Caspian Basin as a reference for subsequent processing and developed more market for the future.