致密砂岩储层构型特征及评价——以库车前陆盆地迪北地区侏罗系阿合组为例  

Characteristics on reservoir architecture and quality of tight sandstone reservoirs:Taking Jurassic Ahe formation in Dibei area of Kuqa foreland basin as an example

作　　者：史超群[1] 李勇[1] 袁文芳[1] 蒋俊[1] 谢亚妮[1] 张荣虎 周思宇 娄洪 王佐涛 张慧芳[1] 陈常超 王振鸿[1] SHI Chaoqun;LI Yong;YUAN Wenfang;JIANG Jun;XIE Yani;ZHANG Ronghu;ZHOU Siyu;LOU Hong;WANG Zuotao;ZHANG Huifang;CHEN Changchao;WANG Zhenhong(Exploration and Development Research Institute,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China;PetroChina Hangzhou Insititute of Geology,Hangzhou,Zhejiang 310023,China)

机构地区：[1]中国石油天然气股份有限公司塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]中国石油杭州地质研究院,浙江杭州310023

出　　处：《中国矿业大学学报》2021年第5期877-892,共16页Journal of China University of Mining & Technology

基　　金：国家重点研发计划(2019YFC0605505)。

摘　　要：在野外露头观察、岩相分析、储层精细构型解剖的基础上,结合成像测井资料,对库车前陆盆地北部构造带迪北地区侏罗系阿合组辫状河三角洲平原储层构型进行了系统研究,识别出五级构型界面,划分出五种构型单元,包括滞留沉积、顺流加积体、侧积砂体、纹积砂体和河漫滩,并建立构型单元的空间分布模式.结合薄片、物性和黏土矿物X衍射等资料,对不同构型单元储层品质进行了评价,认为不同构型单元储层不仅沉积条件(规模、形态、粒级、沉积构造、泥质杂基含量等)有所不同,而且具有不同的孔隙结构特征和储集性能,不同构型单元在空间上频繁迁移造成了储层较强的非均质性.研究结果表明:顺流加积体是辫状分流河道心滩的主体,延伸长度可达上千米、宽度可达数百米、厚度可达5 m,泥质杂基镜下百分比平均为4.8%,储层分选性好,粒内溶孔面孔率可达5%,孔隙度平均约为9.4%,渗透率平均约为7.316 mD,储集条件最好.侧积砂体主要位于心滩侧翼,延伸长度达数百米、宽度一般小于顺流加积体、厚度可达3 m,粒内溶孔面孔率可达4%,孔隙度平均约为6.8%,渗透率平均约为1.724 mD,储集条件次之.滞留沉积分选差、泥质杂基镜下百分比平均为7.1%,储层孔隙类型主要为微孔隙和微裂缝,孔隙度平均约为4.7%,渗透率平均约为0.648 mD,储集条件差.纹积砂体泥质杂基镜下百分比平均为8.7%,微裂缝面孔率占比可达90%,孔隙度平均约为3.7%,渗透率平均约为0.115 mD,储集条件最差.河漫滩则以泥质沉积为主,为非储层.Based on the foundation of outcrop profile tracing measurement, lithofacies analysis and fine architecture dissection, combing with imaging logging data, a system study was made of Jurassic Ahe Formation braided river delta deposit at Dibei region, in the northern structural belt of Kuqa foreland basin. Five architectural interfaces were identified, and five reservoir architecture units including detention deposit, downstream accretion sand body, lateral accretion sand body, laminated sand body as well as flood plain were recognized further more. The spatial distribution of the configuration units was built finally. The reservoir quality of different architecture units was compared and analyzed using the thin section, physical property analysis, clay mineral X-ray diffraction data etc. Different architecture units not only are deposited in different sedimentary conditions, with different scales, shapes, particle sizes, sedimentary structures, mud contents, etc, but also own different pore structures and reservoir qualities. The results show that the downstream accretion sand bodies, the main body of braided distributary channel bar, are the best reservoirs because of their large scales(lengths up to thousands of meters, widths up to hundreds of meters and thicknesses up to 5 m), well-sorted characteristics, low volume fractions of argillaceous hybrid matrix(averaging 4.8%), developed intragranular dissolve pores(plane porosity up to 5%), large porosities(averaging 9.4%) and permeabilities averaging 7.316 mD. The lateral accretion sand bodies, mainly located on the flank of braided distributary channel bar, are the second best reservoirs, for their lengths up to hundreds of meters, widths smaller than that of downstream accretion sand bodies, thicknesses up to 3 m, plane porosities of intragranular dissolve pores averaging 4%, porosities averaging 6.8% and permeabilities averaging 1.724 mD. The detention deposits own poor reservoir quality and are poorly-sorted, with volume fractions of argillaceous hybrid matrix

关 键 词：库车前陆盆地 侏罗系阿合组 致密砂岩 储层构型 储层品质评价 

分 类 号：TE122.2[石油与天然气工程—油气勘探]