川东北地区元坝气田与普光气田长兴组气藏特征对比分析  

Difference Analysis of Changxin Formation Gas Reservoir between Puguang Gas Field and Yuanba Gas Field in the Northeast of Sichuan Area

作　　者：陈丹[1] 

机构地区：[1]中国石化勘探南方分公司勘探研究院,四川成都610000

出　　处：《石油天然气学报》2011年第10期11-14,164,共4页Journal of Oil and Gas Technology

摘　　要：通过天然气地球化学特征、地层水地球化学特征对比分析表明,元坝气田和普光气田长兴组气藏天然气中烃类气体均以甲烷为主,非烃气体H2S含量普光气田高于元坝气田;元坝气田天然气甲、乙烷碳同位素明显重于普光气田;普光气田长兴组气藏水型为重碳酸钠型与氯化钙型,元坝长兴组气藏水型为氯化钙型,显示元坝气田长兴组在油气聚集和赋存方面可能更有优势。烃源岩分布和气源对比研究认为,二叠系烃源岩是普光和元坝气田长兴组天然气的主要气源层;成藏模式的对比分析表明元坝气藏和普光气藏的输导体系存在一定的差异,普光气藏输导体系为断层和储集层,而元坝气藏为裂缝和储集层。Through analysis of gas geo-chemical characteristics and geochemical characteristics of formation water,it indicated that hydrocarbon gases of Changxin Formation in Yuanba Gas Field and Puguang Gas Field were mainly methane,and H2S content of non-hydrocarbon gas in Puguang Gas Field was higher than that of Yuanba Gas Field.The ethane carbon isotope of Yuanba Gas Field was significantly higher than that of Puguang Gas Field.The water type was heavy sodium carbonate and calcium chloride in Changxin Formation of Puguang GasField,calcium chloride was in Changxin Formation of Yuanba Gas Field.It indicated that the accumulation of oil and gas occurrence may be more advantageous in Yuanba Gas Field.The research indicates by distribution of source rock and gas source correlation that the main gas source is Permian source rocks.The comparative analysis of reservoir-forming pattern shows that there are some differences in transportation system in Yuanba Gas reservoir and Puguang gas pool.The pathway system of Puguang Gas Pool is fault and reservoir,and Yuanba Gas Reservoir is fracture and reservoir.

关 键 词：元坝气藏 普光气藏 长兴组 气藏特征 

分 类 号：P618.13[天文地球—矿床学]