Preface Chapter1 The Bases and Identification of Abiogenic Natural gases 1·1 Summary of the Abiogenic Origin Theory 1·2 Geochemical Bases of Abiogenic Gases 1·3 Identification of Organic and Abiogenic Gases Chapter2 Abiogenic Gases in Magmatic Rock Inclusions 2·1 Abiogenic Gas Components in Magmatic Rock Inclusions 2·2 Gas Components of Metal Deposits 2·3 Carbon Isotope composition of Inclusions in Magmatic Rocks and Hydrothermal Deposits Chapter 3 Characteristics of Abiogenic Gases in Hot and Cold Springs of Eastern China 3·1 Characteristics of Natural Gases in Hot and Cold Springs 3·2 Examples and Origins of Hot and Cold Spring Gases Chapter 4 Characteristics of Helium Isotopes in Natural Gases of Eastern China 4·1 Characteristics of Helium Isotopes in Oil and Gas-bearing Basins of Eastern China 4·2 Characteristics of Helium Isotopes in Oil and Gas-bearing Areas of Central and Western china 4·23 Some Applications of Helium Isotopes in Geological Studies Chapter5 Typical Abiogenic Gas Deposits in Eastern China and the Conditions Governing Their Formation 5·1 Classification of CO2 Gas Deposits 5·2 Wanjinta Abiogenic CO2 Gas Field in the Songliao Basin 5·3 Abiogenic CO2 Gas Pools (Fields) in the Huanghua Depression 5·4 Abiogenic Carbon Dioxide Gas Fields in the Jiyang Depression 5·5 Abiogenic CO2 Gas Fields (Pools) in the North Jiangsu Basin 5·6 Abiogenic CO2 Field (Pools) in the Sanshui Basin 5·7 A Study on Abiogenic Hydrocarbon Gas in Petroliferous Basins in Eastern China Chapter6 Characteristics of Abiogenic Gases in Eastern China and Areas Favorable to Their Occurrence 6·1 The Mesozoic-Cenozoic Structural Evolution and the Discharge and Accumulation of Abiogenic Gases 6·2 Indicators of Abiogenic Gases and Factors Controlling Their Distribution 6·3 Discharge and Accumulation Models for Abiogenic Gases and Gas Pool Prospecting Plates and Their Illustration