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    何家雄, 马文宏, 祝有海, 龚晓峰. 南海北部边缘盆地天然气成因类型及成藏时间综合判识与确定[J]. 中国地质, 2011, 38(1): 145-160.
    引用本文: 何家雄, 马文宏, 祝有海, 龚晓峰. 南海北部边缘盆地天然气成因类型及成藏时间综合判识与确定[J]. 中国地质, 2011, 38(1): 145-160.
    HE Jia-xiong, MA Wen-hong, ZHU You-hai, Gong Xiao-feng. Integrated identification and determination of genetic types and accumulation time in the marginal basin of northern South China Sea[J]. GEOLOGY IN CHINA, 2011, 38(1): 145-160.
    Citation: HE Jia-xiong, MA Wen-hong, ZHU You-hai, Gong Xiao-feng. Integrated identification and determination of genetic types and accumulation time in the marginal basin of northern South China Sea[J]. GEOLOGY IN CHINA, 2011, 38(1): 145-160.

    南海北部边缘盆地天然气成因类型及成藏时间综合判识与确定

    Integrated identification and determination of genetic types and accumulation time in the marginal basin of northern South China Sea

    • 摘要: 提要: 20世纪90年代以来,南海北部边缘盆地天然气勘探进展迅速,除早期在琼东南盆地发现YC13-1气田以外,陆续在莺歌海盆地发现了DF气田群和LD气田群,在珠江口盆地发现了WC气田群及PY气田群,近期在珠江口盆地南部深水区则发现了LW-LH气田群。这些气田群气藏天然气组成,主要以烃类气为主,但莺歌海盆地气田群部分区块及层段亦含有丰富的CO2 (二氧化碳)和N2(氮气)等非烃气。根据天然气地质地球化学特征,借鉴国内外通用判识划分方法及指标,该区烃类气可综合判识与划分为生物气及亚生物气、成熟油型气、成熟-高熟煤型气及高熟-过熟气等成因类型;该区非烃气CO2可划分为壳源型(有机/无机)、壳幔混合型及火山幔源型等三大成因类型。非烃气N2则可划分为大气成因、壳源型有机成因和壳源型有机-无机混合成因等3种主要成因类型。对于不同气藏烃类气形成及成藏时间判识与厘定,主要依据其地球化学特征及生烃动力学、同位素动力学模拟实验和含烃盐水包裹体及自生伊利石Ar-Ar同位素定年,并结合具体成藏地质条件分析而综合判识与确定;对于非烃气形成及成藏时间,则主要根据伴生烃类气形成时间,并结合温压双控热模实验结果及地质条件综合判识与确定。

       

      Abstract: Abstract:Gas exploration has made rapid progress in the marginal basin of northern South China Sea since the 1990’s. In addition to YC13-1 gas field found in the early stage in Qiongdongnan basin, DF gas field belt and LD gas field belt were found in succession in Yinggehai basin, WC gas field belt and PY gas field belt were found in Zhujiangkou basin, and LW-LH gas field belt was found recently in deep water area of Zhujiangkou basin. The gas composition of these gas field belts is mainly hydrocarbons, with some blocks of the gas field belts in Yinggehai basin aslo rich in CO2 (carbon dioxide), N2 (nitrogen) and other non-hydrocarbon gas. According to geological and geochemical characteristics of the gas as well as known genetic identification criteria and indicators of N2 both in China and abroad, the types of the gas in this area can be divided into biogas, quasi- biogas, mature oil type gas, mature-high mature coal type gas and high mature-over mature gas. CO2 gas cloud be divide into three main types, i.e., shell type (organic / inorganic), crust-mantle mixed type and volcanic type. N2 gas cloud be divided into three main genetic types, i.e., atmosphere, crust and crust-derived organic type and organic-inorganic mixed type. The identification and determination of the formation and accumulation time of different gas reservoirs are mainly based on geochemical characteristics and dynamics of hydrocarbon production, dynamics of isotope and hydrocarbon-bearing brine inclusions and Ar-Ar isotopic dating of autogenetic illite, in combination with concrete geological conditions of accumulation so as to make synthetic judgment and decision. The formation and accumulation time of non-hydrocarbon gas is mainly based on the formation time of associated hydrocarbon gas in combination with double controlling factors of temperature and pressure in thermal simulation and geological conditions t so as to make synthetic judgment and decision.

       

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