西峰油田长8和长6储层物性影响因素分析  

Analysis of influence factors on sandstone reservoirs of the Chang 8 and Chang 6 members in Xifeng Oil Field,southwestern Ordos Basin

作　　者：刘小洪[1,2] 罗静兰[1] 刘新菊[3] 靳文奇[3] 党永潮[3] 胡友洲[3] 郭兵[3] 

机构地区：[1]西北大学大陆动力学国家重点实验室,陕西西安710069 [2]西南石油大学资源与环境学院,四川成都610500 [3]长庆油田分公司采油一厂,陕西延安716000

出　　处：《西北大学学报（自然科学版）》2009年第1期102-108,共7页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(40872083);国家重点基础研究发展计划基金资助项目(2003CB214603)

摘　　要：目的研究沉积、成岩作用以及成岩相对西峰—合水地区上三叠统延长组长8和长6储层物性的影响。方法利用岩心观察描述、铸体薄片观察、图像粒度、扫描电镜、阴极发光以及毛管压力分析对储层进行综合研究。结果压实和胶结作用是造成长8及长6储层孔隙度丧失的主要因素,重结晶作用和溶解作用是改善其物性的重要途径;可划分出5种成岩相带,成岩相的分布明显受沉积微相控制。结论长8与长6砂岩在岩石学特征、物性及孔隙结构等特征方面存在明显的差异。砂岩粒度较细、泥质含量较高是造成长6砂岩较长8砂岩孔隙度、渗透率偏低的主要原因。Aim To study controlling factors of sedimentation, diagenesis, and diagenetic facies on reservoir quality of the Chang 8 and Chang 6 members of Yanchang formation in Xifeng-Heshui area semi-quantitatively or quantitatively. Methods Based upon detailed description and observation of drilling cores, various modern analytical and measurement techniques including identification of blue epoxy resin-impregnated thin sections, grain size analytical data, electron san microscope （ESM） and capillary pressure for integrative studying of reservoirs. Results Compaction and cementation are the main diagenetic factor which caused the loss of porosity both for the Chang 6 and Chang 8 sandstones. Recrystallization and dissolution are two important approaches to improve physical properties for the sandstones. Five diagenetic facies can be recognized and they are obviously controlled by the depositional microfacies. Conclusion There are obvious differences between the Chang 8 and Chang 6 sandstone of petrological characteristics, physical properties and pore structure features. The fine grain size and high content of argillaceous in the Chang 6 sandstones are internal causes resulted in low-porosity and very low-permeability.

关 键 词：成岩作用 成岩相 长8和长6油层组 西峰油田 

分 类 号：P588.2[天文地球—岩石学]