李勇1,陈世加1,2,3,路俊刚1,2,肖正录1,何清波1,苏恺明1,李俊良4
Li Yong1,Chen Shi-jia1,2,3,Lu Jun-gang1,2,Xiao Zheng-lu1,He Qing-bo1,Su Kai-ming1,Li Jun-liang4
摘要: 川中地区须家河组具有大面积含气、充注程度低、局部富集高产及气水关系复杂的特征。为探明川中须家河组天然气成藏特征与成藏主控因素,对该区天然气组分、碳同位素、源岩解析气轻烃、烃源岩分布、储层物性、构造幅度以及异常压力进行综合分析。结果表明:川中地区须家河组天然气为煤成气,具有近源—间互式成藏的特征;烃源岩总累计厚度大,但单层厚度薄,源岩与砂岩互层状分布,生气强度低,天然气充注能力弱;异常高压的发育,为研究区天然气运移提供了充注动力;在气源不足的情况下,天然气会优先充注物性好的砂体,储层物性控制了气藏充注程度;平缓的构造背景下,局部的低幅度构造控制了气藏的分布格局,构造幅度越高,气水分异越充分,越容易形成纯气藏。川中地区须家河组源内砂体具有较好的勘探前景,川西北、川西南地区须三段以及川中西部须五段是源内气藏的有利勘探目标。
中图分类号:
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