丰谷须家河组天然气地球化学特征与气源对比  

Geochemical Characteristics and Gas Source Correlation of Xujiahe Formation in Fenggu Area

作　　者：冯杰瑞[1] 冷济高[2] 朱宏权[2] 王鹏[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室.成都理工大学,四川成都610059 [2]中国石化西南分公司勘探开发研究院,四川成都610081

出　　处：《天然气技术与经济》2012年第2期18-21,77,共4页Natural Gas Technology and Economy

基　　金：中国石化西南油气分公司基金项目"孝泉-丰谷构造须家河组成藏机理差异性研究"的一部分(编号:GT-146-0924)

摘　　要：川西坳陷丰谷地区具有良好的天然气成藏条件和有利的生、储、盖组合,对该地区的天然气地球化学特征进行了分析和气源追踪。通过天然气组分、碳同位素、天然气干燥系数等地球化学特征分析以及有机碳同位素、萜/藿烷烃指纹、孕甾烷及升孕甾烷的对比,认为丰谷地区须家河组天然气属于典型的腐植气;须二上亚段气藏天然气为自生自储和下生上储,气源主要来自须二段砂泥互层和马鞍塘—小塘子组烃源岩;须四上亚段储层沥青主要来自须三段和须二段烃源岩;须四中亚段气源则主要来自须三段烃源岩。There is better gas reservoir-forming conditions and favorable source,reservoir and caprock association in Fenggu area,Western Sichuan Depression.In this paper,gas geochemical characteristics including composition,carbon isotope and dry coefficient are analyzed and gas source is traced.In addition,the organic carbon isotope,terpane/hopane alkanes fingerprint,pregnane and rising pregnane are correlated.Results show that(1) gas from Xujiahe Formation in Fenggu area belongs to typical humic gas ;(2) gas from the upper Xujiahe 2 Member is of self-generation and self-accumulation along with lower-generation and upper-accumulation.Simultaneously,gas comes from the sandstone interbedded with mudstone in Xujiahe 2 Member and the source rock of Maantang-Xiaotangzi formations ;(3) bitumen in the upper Xujiahe 4 Member is mainly from source rock of Xujiahe 3 and Xujiahe 2 members ;and(4) gas in middle Xujiahe 4 Member is mainly from source rock of Xujiahe 3 Member 。

关 键 词：丰谷地区 须家河组 碳同位素 气源对比 天然气组分 

分 类 号：P618.13[天文地球—矿床学]