摘要
通过研究区内大量岩心铸体薄片及物性资料分析,对姬塬地区长8段的沉积特征、岩石学特征、孔隙类型、微观孔隙结构特征及成岩作用进行研究,并分析影响储层物性的主要因素。研究后可知,研究区长8储层发育湖泊、三角洲沉积,三角洲前缘水下分流河道砂体是主要的储集体;岩石类型主要为细、中粒岩屑长石砂岩及长石岩屑砂岩,具有成分成熟度较低、结构成熟度一般的特点;粒间孔及长石溶孔是主要的储集空间,孔喉分布为偏小孔细喉型,且分选性差,非均质性强。砂岩孔隙度平均为9.448%,渗透率平均为0.685×10-3μm 2,为特低渗储层。研究后认为,研究区储层特征主要受到沉积作用和成岩作用的影响,其中沉积相带在宏观上控制了储层的发育条件及分布;压实作用、胶结作用是造成孔隙度下降的重要原因,而溶蚀作用则改善了储层的物性。
By analyzing the thin sections and physical property,the petrology feature and pore characteristics of the Chang 8 Formation in the Jiyuan Area,the microscopic reservoir pore structure characteristics,characteristics of porosity and permeability are studied and the reservoir performance′s main influencing factors were analyzed.The results suggest that delta sediments are the main deposits in the Chang 7 Formation,and delta front underwater distributary channel sand is the main reservoir.The lithological characteristics mainly include fine-grained lithic feldspathic sandstone and feldspathic detritus sandstone,with low compositional maturity and middle textural maturity.Granular pore and secondary feldspar-dissolution pore are the main pore types.Pore throat presents fine pore fine throat with poor sorting and high micro-heterogeneity.The Chang 7 reservior has low permeability of which the porosity is below 9.448%and the permeability is less than 0.685×10-3μm 2.The reservoir characteristics are influenced by deposition and diagenesis primarily.Sedimentary facies zone controlled development and distribution of reservoir.Besides,compaction and cementation lead to porosity decreased,but the dissolution improves the reservoir propert.
作者
李兆雨
李文厚
吴越
刘溪
张倩
白金莉
杨博
LI Zhaoyu;LI Wenhou;WU Yue;LIU Xi;ZHANG Qian;BAI Jinli;YANG Bo(Department of Geology/State Key Laboratory of Continental Dynamics,Northwest University,Xi′an 710069,China;The Eleventh Oil Production Plant,Changqing Oilfield Company,PetroChina,Qingyang 745000,China)
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第2期193-203,共11页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学重点基金资助项目(41330315)
陕西省自然科学基础研究计划资助项目(2013JQ5009)。
关键词
储层特征
主控因素
延长组
姬塬地区
鄂尔多斯盆地
reservoir characteristics
controlling factors
Yanchang Formation
Jiyuan Area
Ordos Basin
