3 results about "Spatial filter" patented technology

The invention provides a delta facies sand body spatial form characterization method which comprises the following steps: S1, preprocessing observed seismic data through a variable coefficient guideddirection optimization spatial filtering technology to improve a signal-to-noise ratio; S2, under the guidance of the longitudinal superposition characteristics of the sand body gene units identifiedby the logging data, acquiring position characteristic parameters required for characterizing the spatial form of the sand body from the preprocessed seismic data; and S3, carrying out spatial direction sensitivity research on the sand body posture characteristic parameters in inclination angles, azimuth angles and time directions to obtain optimized parameter values of equalization distribution processing. The challenge faced by the conventional method for characterizing the gene unit in the delta facies sand body is solved, and the increasingly increased high-precision characterization requirement of the reservoir in the oil and gas field development is met.

The invention relates to the technical field of spatial filtering devices, and provides a spatial filtering device. The spatial filtering device comprises a frequency division lens, a recovery lens and at least two filtering small holes, wherein the frequency division lens and the recovery lens form a confocal optical system; and the filtering small holes are positioned between a focal point of the confocal optical system and the frequency division lens and/or the recovery lens. The plurality of the filtering small holes share scattering effect of high-frequency components of a laser beam evenly, the laser power absorption of one single filtering small hole is reduced so that the safety performance is improved, and the filtering effect of various kinds of high-frequency components of the laser beam is significantly improved so that the low-pass spatial filtering function can be better realized. Since the filtering small holes are positioned far away from the focal point, the size of faculae is large, the corresponding power density is low, and spark phenomenon is not liable to occur. In addition, the size of the filtering small holes is large, the processing difficulty is reduced, the misalignment tolerance of small hole adjustment is increased, and the system is easy to operate stably.