火山岩储层中的烃碱流体作用及其地质意义-断块油气田.PDF

断 块 油 气 田 17 卷 1 期 FAULT-BLOCK OIL GAS FIELD 2010 年1 月 5 文章编号 1005-8907 渊20 10冤0 1-005-05 火山岩储层中的烃碱流体作用及其地质意 柳成志 于海山 渊大庆石油学院地球科学学院 黑龙江大庆 163318冤 基金项目 十五冶国家科技攻关计划 国油气资源发展关键技术研究冶项目渊200 1BA605A 冤 摘 要 徐家围子断陷位于松辽盆地北部袁断陷发育期火山活动强烈袁早白垩世营城组火山岩分布最为广泛袁是松辽盆地 北部深层天然气的重要储层类型遥 兴城地区营城组火山岩气藏储层以酸性火山岩为主袁储集空间可分为原生孔隙尧次生孔 隙和裂隙3 种类型袁其 次生溶蚀孔隙是本区主要储集类型之一遥 烃碱流体作用对改善储层的储渗能力具有重要意义袁主 要体现在次生孔隙带的形成尧发育程度上遥 烃碱流体不仅可以使火山岩体处于开放体系袁原有矿物发生交代蚀变尧溶蚀袁造 成岩石内部结构破坏尧机械强度减低尧孔隙度增加袁形成类似海绵体的结构袁也可以充填尧阻塞孔隙而降低孔渗性质袁这取决 于烃碱流体在储层 引起物质带入与带出的比例遥 关键词 烃碱流体曰次生孔隙带曰碱交代作用曰火山岩曰成岩作用曰徐家围子断陷 + 中图分类号 TE122.2 22 文献标识码 A Hydrocarbon alkali fluid and its geological significance of volcanic reservoir Liu Chengzhi Yu Haishan (College of Geoscience, Daqing Petroleum Institute, Daqing 163318, China) Abstract: Xujiaweizi Faulted Depression is located in the north of Songliao Basin and the vocanic activity was violent during the development stages of the depression. The vocanic rocks of the early Cretaceous Yingcheng Formation are widely distributed, and they are the important reservoir type of the deep natural gas in northern Songliao Basin. The volcanic gas reservoirs are mainly acidic volcanic rocks in Yingcheng Formation of Xingcheng Region. There are 3 types of reservoir spaces. They are primary pore secondary pore and cracks, and the secondary dissolution pore is one of the most important types of the reservoir space in this region. The activity of hydrocarbon alkali fluid is important in improving the storing capacity and the permeability, which might dep