This book presents the research on geological genetic analysis of oil and gas reservoirs. It expounds on the methods, problems, and prospects of geological genetic analyses of oil and gas reservoirs, considering structures, reservoirs, and oil–gas–water (OGW) systems. Then, it explains the application of geological genetic analysis of oil and gas reservoirs with examples of volcanic rocks in the Songliao Basin, glutenites in the northwestern Junggar Basin, and sandstones in the Liaohe Basin. It is a valuable reference for researchers, engineers, and graduate students engaged in oil/gas exploration both from industrial and academic sectors.