致密储层储集空间特征及影响因素——以准噶尔盆地吉木萨尔凹陷二叠系芦草沟组为例

发布时间：2018-09-11 21:00

【摘要】：综合利用薄片鉴定、氩离子抛光、聚焦双离子束扫描电镜、能谱、XRD、恒速压汞等技术手段,结合岩心观察,综合分析了准噶尔盆地吉木萨尔凹陷二叠系芦草沟组致密储层岩石学特征、物性特征、储集空间特征及其影响因素.认为储集空间特征受沉积作用、成岩作用、生烃作用及构造作用的共同控制,压实作用是导致储层致密化的主要原因,长石、岩屑和凝灰物质的溶蚀是形成"高孔高渗"储层的关键.研究结果表明:芦草沟组致密储层低成分和结构成熟度特点导致储层抗压能力弱,原生粒间孔空间变小,储层平均孔隙半径为124.5μm,平均喉道半径为0.3μm,平均孔喉半径比为339.1;生烃作用产生的有机酸导致次生溶孔发育,次生溶孔和原生粒间孔占总孔隙的80%以上;受沉积作用控制,储集空间类型组合由湖盆边缘的原生粒间孔+次生溶孔组合向湖盆中心的次生溶孔+原生粒间孔+晶间孔组合过渡;生烃产生的异常高压与构造作用可形成微裂缝,改善储层渗流能力.
[Abstract]:Comprehensive use of thin slice identification, argon ion polishing, focused dual ion beam scanning electron microscopy, energy dispersive X RD, constant speed mercury pressure and other technical means, combined with core observation, The petrological characteristics, physical properties, reservoir spatial characteristics and influencing factors of the compact reservoir of the Permian Lucaogou formation in Jimusar depression of Junggar Basin are comprehensively analyzed. It is considered that the reservoir spatial characteristics are controlled by sedimentation, diagenesis, hydrocarbon generation and tectonism, and compaction is the main cause of reservoir densification, feldspar, and feldspar. The dissolution of cuttings and tuff is the key to the formation of "high porosity and high permeability" reservoir. The results show that the low composition and structural maturity of the tight reservoir in the Luchaogou formation result in the weak compressive capacity of the reservoir and the decrease of the pore space between primary grains. The average pore radius of reservoir is 124.5 渭 m, the average throat radius is 0.3 渭 m, and the average pore throat radius ratio is 339.1. The secondary dissolved pore is developed by organic acid produced by hydrocarbon generation, and the secondary dissolved pore and primary intergranular pore account for more than 80% of the total pore, which is controlled by sedimentation. The reservoir spatial assemblage transits from the primary intergranular pore assemblage in the margin of the lake basin to the primary intergranular pore assemblage in the center of the lake basin, and the abnormal high pressure generated by hydrocarbon generation and tectonic action can form microfractures. Improve reservoir percolation capacity.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中国石油新疆油田公司;
【基金】：国家重点基础研究发展计划(973)项目(2014CB239005) 中央高校基本科研业务费专项资金项目(15CX06006A)
【分类号】：P618.13

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