摘要
华庆油田三叠系延长组长6油层组砂岩储层是典型的低孔超低渗储层,成分成熟度低,结构成熟度中等。薄片镜下鉴定表明,长6油层组储层砂岩主要经历了压实-压溶、胶结、交代、溶蚀和破裂等成岩作用过程,综合分析其处于中成岩阶段A期。孔隙度演化的定量分析表明:早成岩阶段的压实造成50.9%的原始粒间孔隙度损失,是储层致密的主控因素;早成岩期和中成岩期的胶结作用造成27.6%的原生粒间孔隙度损失,是超低渗储层形成的重要因素;中成岩阶段的溶蚀作用使孔隙度增加了3.2%,微裂缝使孔隙度增加了0.4%,有效地改善了储层的储集和渗流能力。
Chang-6 sandstone reservoir of Yanchang Formation in Huaqing Oilfield was a typical low porosity and ultra-low permeability reservoir ,it was low compositional maturity and middle textural maturity.By identifying thin section diagenesis of Chang-6 sandstone reservoir experienced compaction,pressolution,cementation,metasomasis,dissolution and cataclasis,and comprehensive research showed that Chang-6 sandstone reservoir was currently at the first stage of the middle-diagenesis period.Based on quantitative analysis of porosity evolution during the reservoir diagenesis,50.9% of primary intergrannular porosity was lost in compaction and pressolution during early diagenesis ,it is the major control factor of tigh reservoir; 27.6% primary intergrannular porosity was lost in the cementation of early and middle diagenesis,it is the major factor of inducing extra-low pereability reservoirs,in which 3.2% porosity increases because of the disslution in the middle diagenesis period and 0.4% microfrature porosity increases,by which reservoir pore space and connectivity are effectively improved.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2010年第4期12-17,共6页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2009ZX05009)
关键词
华庆油田
长6油层组
成岩作用
Ordos Basin
Huaqing Oilfield
Chang-6 sandstone reservoir
diagenesis
porosity evolution
作者简介
周晓峰（1973-），男，1997年大学毕业，博士（后），讲师，现主要从事油气地质综合研究和油气藏精细描述工作
