中国石油申请自由表面多次波噪声压制方法专利，具有更好的收敛性能和运算精度

Group 1 - The core point of the article is that China National Petroleum Corporation (CNPC) has applied for a patent for a method, device, and equipment for suppressing multiple wave noise on free surfaces, indicating ongoing innovation in seismic data processing [1] Group 2 - CNPC was established in 1999 and is primarily engaged in oil and natural gas extraction, with a registered capital of 18,302,097,000 RMB [2] - The company has invested in 1,296 enterprises and participated in 443 bidding projects, showcasing its extensive involvement in the industry [2] - CNPC holds 38 trademark registrations and 5,000 patent records, along with 168 administrative licenses, reflecting its significant intellectual property portfolio [2]