本书主要分析中国34个典型煤成大气田的基本地质概况、气藏类型、天然气成因类型和和气源岩以及成藏过程，重点论述天然气的地球化学特征，如组分、稳定碳氢同位素、轻烃以及伴生凝析油的碳同位素、生物标志物等组成，判别天然气成因，并结合气田地质条件分析气源。

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Large Gas Fields and Their Significance in the Natural Gas Industry 1
CHAPTER OUTLINE 1
Large Gas Fields and Their Important Roles 1
1.1 Classification Criteria of Large Gas Fields 1
1.2 Large Gas Field-An Important Foundation for a Great Gas-Producing Country 2
1.2.1 Large Gas Fields Change China from a Poor Gas Producer to a Great Gas Producer3
1.2.2 Large Gas Fields Make Russia the “Saudi Arabia of Natural Gas” 6
2. Geological and Geochemical Characteristics of Large Gas Fields in China 10
2.1 Geochemical Characteristics 10
2.1.1 Natural Gas Components 10
2.1.2 Natural Gas Sources 11
2.2 Geological Characteristics 23
2.2.1 Reservoir 23
2.2.2 Gas Accumulation Stages 27
2.2.3 Gas Reservoir Types 29
References 31