Bio-Genetic and Sub-Biogenetic Gas Resource Potential and Genetic Types of Natural Gas Hydrates in the Northern Marginal Basins of South China Sea
详细信息
- 责任者：He Jiaxiong (Key Laboratory of Marginal Sea Geology ; Chinese Academy of Sciences ; Guangzhou 510301 ; China) ; Yan Wen
- 刊名：Natural Gas Industry
- 出版年：2013
- 卷期：33(6)
- 关键词：生物气 ; biogenetic gas ; 天然气水合物 ; gas hydrates ; 南海 ; South China Sea
- 页码：p.121-134
- 图表：illus., 1 table, 43 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
Abundant natural gas resources have been found in the marginal basins of the South China Sea.Besides a huge amount of mature and highly mature(humic types) coal-formed gas in the shallow and middle-deep strata there,a great quantity of biogenetic and sub-biogenetic gas displays as well as their reservoirs have been discovered in shallow formations.Therefore,this paper aims to make clear many essential geological issues in this study area: the resource potential of biogenetic and sub-biogenetic gas,the origin of natural gas hydrates and its mineralization and accumulation modes,and so on.First,based on a number of geochemical data collected from the exploration over the past years,this paper analyzed the geological conditions of hydrocarbon pooling and then made a deep investigation into the geological and geochemical characteristics of biogenetic and sub-biogenetic gas and the distribution features of hydrocarbon source rocks in Neogene and Quaternary bed layers in the northwestern Yinggehai-Qiongdongnan basins and the northeastern Pearl River Mouth Basin.On this basis,the generation amount and resource extent of biogenetic gas in the above-mentioned basins were preliminarily predicted and estimated.The following findings were obtained.First,the rich biogenetic and sub-biogenetic gas in this study area can completely be regarded as the main gas source of natural gas hydrate in the deep water of northern South China Sea.Second,through the geochemical analysis of the genetic types of gas hydrate in this deep water area,it is confirmed that the gas hydrate discovered so far belongs to self-source diffusion mode,the source of which comes from a kind of mixed gas dominated by biogenetic gas in situ or nearby,while the mineralization and accumulation mode of gas hydrate can be classified into a near-source migrated and accumulated self-source diffusion genetic model,which has tremendous resource potential.
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