摘要
为明确靖安油田大路沟地区长6致密砂岩储层非均质性特征及其成因,综合利用铸体薄片鉴定、扫描电镜分析、物性测试和压汞实验等方法及钻测井解释资料,以分形理论为指导,分析长6储层宏观非均质性和微观孔隙结构分形特征,并对该储层非均质性成因展开讨论.结果表明,长6储层砂岩类型主要为长石砂岩,基于压汞实验参数将孔隙结构类型划分为中孔-中细喉型(Ⅰ型)、中小孔-细喉型(Ⅱ型)和小孔-微细喉型(Ⅲ型).从层内、层间和平面研究长6储层宏观非均质性,渗透率非均质程度系数评价显示长6各亚段均为强非均质性,自长61至长63非均质性逐渐增强.基于分形理论的储层微观非均质性研究结果表明,长6储层样品具有3段分形的特征,宏孔、中孔和微孔的分形维数平均值依次为2.9892、2.6931和2.1772,宏孔和中孔是长6储层渗透率和微观孔隙结构非均质性的主要来源,宏孔和微孔的非均质性对最大进汞饱和度影响更加明显.分析长6储层非均质性成因发现,沉积微相控制了砂体和物性等宏观非均质性因素,压实作用使储层原生粒间孔大幅减少,对宏孔和微孔的非均质性影响较大,绿泥石胶结作用和浊沸石溶蚀作用对孔隙结构改造作用强,对储层孔隙结构非均质性影响大.研究结果对大路沟地区长6油藏的效益开发具有指导意义.
In order to clarify the heterogeneity characteristics and their genesis of Chang 6 tight sandstone reservoir in the Dalugou area of Jing’an oilfield,the macroscopic heterogeneity and microscopic pore structure fractal characteristics of the reservoir in the target area are analyzed by using data from casting thin sections,scanning electron microscope,physical property tests,mercury injection experiment,drilling and logging,and so on.The causes of reservoir heterogeneity are discussed.The results show that the Chang 6 reservoir is mainly composed of feldspathic sandstone.Based on the parameters from mercury injection experiments,the pore structure can be divided into three types:medium pore,medium-to-fine throat(type I);medium-to-small pore,fine throat(type II);small pore,microfine throat(type III).The macroscopic heterogeneity of Chang 6 reservoir is investigated from three aspects:intra-layer,inter-layer and planar heterogeneity.The evaluation of permeability heterogeneity coefficient reveals strong heterogeneity across all sub-sections of Chang 6 reservoir,with increasing heterogeneity from Chang 61 to Chang 63.The study of reservoir microscopic heterogeneity based on fractal theory shows that the fractal curve of Chang 6 reservoir samples has two turning points,resulting in three fractal intervals corresponding to macropores(D1),mesopores(D2)and micropores(D3).The average fractal dimensions for D1,D2 and D3 are 2.9892,2.6931 and 2.1772 respectively.Macropores and mesopores are the primary contributors to permeability and microscopic pore structure heterogeneity in Chang 6 reservoir.The heterogeneity of macropores and micropores has more obvious influence on the maximum mercury saturation.The analysis of heterogeneity causes of Chang 6 reservoir show that sedimentary microfacies control the macroscopic heterogeneity factors such as sand body and physical properties.Compaction greatly reduces the primary intergranular pores of the reservoir,which has great impact on the heterogeneity of macropores and micropor
作者
何俊昊
斯尚华
喻意
张天杰
敬小军
杨哲恒
HE Junhao;SI Shanghua;YU Yi;ZHANG Tianjie;JING Xiaojun;YANG Zheheng(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi Province,P.R.China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi’an 710065,Shaanxi Province,P.R.China;Sinopec North China Oil and Gas Company No.2 Gas Production Plant,Xianyang 712000,Shaanxi Province,P.R.China;The Fourth Oil Production Plant of PetroChina Changqing Oilfield Company,Jingbian 718500,Shaanxi Province,P.R.China;The First Oil Production Plant of PetroChina Changqing Oilfield Company,Yan’an 716000,Shaanxi Province,P.R.China;The Seventh Oil Production Plant of PetroChina Changqing Oilfield Company,Xi’an 721000,Shaanxi Province,P.R.China)
出处
《深圳大学学报（理工版）》
CAS
CSCD
北大核心
2024年第6期659-668,I0001-I0005,共15页
Journal of Shenzhen University(Science and Engineering)
基金
陕西省自然科学基金资助项目(2023-YBGY-077)。
关键词
地质学
油田开发
致密砂岩
孔隙结构
储层非均质性
分形维数
大路沟
geology
oilfield development
tight sandstone
pore structure
reservoir heterogeneity
fractal dimension
Dalugou
