断陷湖盆致密砂砾岩储层特征及主控因素

发布时间：2018-06-29 21:54

本文选题：断陷湖盆 + 致密砂砾岩　；参考：《大庆石油地质与开发》2017年06期

【摘要】：为了明确徐家围子断陷沙河子组致密砂砾岩储层发育特征和控制因素,通过岩心观察、薄片分析、电镜扫描、压汞分析和岩石物性测试等手段,对储层的岩石学、储集空间、沉积作用、成岩作用等与物性关系进行了分析。结果表明:砂砾岩储层富含长石、火山岩屑、填隙物等低成熟组分,分选差,岩石颗粒多常见线—凹凸接触;储集空间类型主要为长石溶孔、岩屑溶孔,其次为残余粒间孔、晶间孔、微裂缝;致密砂砾岩孔隙度多数小于6%,渗透率一般小于0.1×10~(-3)μm~2,平均孔喉半径0.01～0.14μm,排驱压力高,孔喉连通性差;储层特征受沉积和成岩作用共同控制,砂砾岩孔隙度与刚性、塑性组分含量密切相关,扇三角洲和辫状河三角洲河道砂体物性较好,强烈压实作用平均减少孔隙度15%～20%,有机酸溶蚀作用平均增加孔隙度4.7%,晚期胶结通过充填残余粒间孔和溶蚀孔平均减少孔隙度4.2%。
[Abstract]:In order to clarify the development characteristics and controlling factors of tight sandy gravel reservoir in Shahezi formation of Xujiaweizi fault depression, the petrology and reservoir space of the reservoir were studied by means of core observation, thin slice analysis, electron microscope scanning, mercury injection analysis and petrophysical testing. The relationship between sedimentation, diagenesis and physical properties is analyzed. The results show that the sandstone and gravel reservoir is rich in feldspar, volcanic debris, interstitial and other low mature components, poor sorting, more common line-concave contact of rock particles, and the main reservoir space type is feldspar dissolved pore, cuttings dissolved pore, and residual intergranular pore, the second is residual intergranular pore. Intergranular pore, microfracture, porosity less than 6, permeability less than 0.1 脳 10 ~ (-3) 渭 m ~ (-2), average pore throat radius 0.01 ~ (-3) 0.14 渭 m, high displacement pressure and poor pore throat connectivity, reservoir characteristics are controlled by sedimentation and diagenesis. The porosity of sandy gravel is closely related to rigidity and plastic component content, and the sand body properties of fan delta and braided river delta are better. Strong compaction reduces porosity by 15 to 20 on average, organic acid dissolution increases porosity by 4.7 on average, and late cementation reduces porosity by filling residual intergranular and dissolution pores by an average of 4.2.
【作者单位】：大庆油田有限责任公司勘探开发研究院;
【基金】：国家重大科技专项“大型油气田及煤层气开发”(2011ZX05001-001-004) 中国石油天然气股份公司重大科技专项“大庆探区非常规油气勘探开发关键技术研究与现场试验”(2012E-2603-02)
【分类号】：P618.13

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