“各有侧重,互相交叉,保持优势,有序竞争”。这是1998年两大石油公司重组时的基本原则。中国石油天然气集团公司,侧重于石油天然气勘探开发,同时经营石油化工业务;中国石油化工集团公司,侧重于石油化工,同时经营石油天然气勘探开发业务。在保持各自优势的同时,建立统一、开放、竞争、有序的全国石油资源、石化产品和技术服务市场,实现上下游、内外贸、产销一体化。 “Each has focus, cross each other to maintain the advantages of orderly competition ”. This is the basic principle when the two major oil companies were reorganized in 1998. China National Petroleum Corporation, focusing on oil and gas exploration and development, while operating the petrochemical business; China Petroleum and Chemical Corporation, focusing on the petrochemical industry, at the same time operating the oil and gas exploration and development business. While maintaining their respective advantages, we will establish a unified, open, competitive and orderly market for petroleum resources, petrochemical products and technical services nationwide and realize the integration of upstream, downstream, internal and external trade, and production and marketing.