Group 1 - China Petroleum & Chemical Corporation (Sinopec) has applied for a patent for a method and system for evaluating heterogeneous reservoirs based on velocity perturbation theory, published as CN119916466A, with an application date of October 2023 [1] - The patent aims to provide a method that includes obtaining corrected seismic data, picking time deviations caused by heterogeneity, calculating velocity perturbation values, and evaluating heterogeneous reservoirs based on these calculations [1] - This method is noted to be more practical compared to traditional methods as it does not rely on the anisotropic characteristics of the reservoir [1] Group 2 - China Petroleum & Chemical Corporation was established in 2000, located in Beijing, with a registered capital of approximately 12.17 billion RMB [2] - The company has invested in 257 enterprises and participated in 5,000 bidding projects, holding 45 trademark records and 5,000 patent records [2] - Sinopec Petroleum Exploration Technology Research Institute, established in 2022 in Nanjing, has a registered capital of approximately 133.61 million RMB and has invested in 1 enterprise, participated in 179 bidding projects, and holds 530 patent records [2]