陇东地区延长组长_(4+5)特低渗储层岩石学特征  

Petrologic Characteristics of Yanchang Formation Chang_(4+5) Member Ultra Low Permeability Reservoir in Longdong Region

作　　者：孙健[1,2] 姚泾利[3] 廖明光[1,2] 南珺祥[3] 廖纪佳[1,2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室,四川成都610500 [2]西南石油大学,四川成都610500 [3]中国石油长庆油田分公司,陕西西安710018

出　　处：《特种油气藏》2015年第6期70-74,144,共5页Special Oil & Gas Reservoirs

基　　金：国家重点基础研究发展计划"973"项目"中国陆相致密油(页岩油)形成机理与富集规律基础研究"(2014CB239005);国家自然科学基金"泥质岩层对低渗透砂岩储层油气成藏的控制机理研究"(41502146)

摘　　要：根据铸体薄片、扫描电镜、粒度分析等资料,对陇东地区延长组长_(4+5)特低渗储层的岩石学特征及其在不同物源方向上的分布规律进行了深入研究。研究表明,陇东地区延长组长4+5存在东北、西南和西部、南部等不同方向的物源,不同物源方向上岩石类型和岩屑成分的分布均呈现北东—南西差异。储层胶结物类型以铁方解石、铁白云石、硅质等为主;颗粒粒度较细,分选性较好,磨圆度以次棱角状为主。砂岩岩石学特征对研究区特低渗储层的成岩作用和物性发育有重大影响。Based on the data like cast slice,SEM and size analysis,this paper conducted thorough study on the petrologic characteristics and distribution pattern in different source directions of Yanchang Formation Chang_(4+5) Member ultra low permeability reservoir in the Longdong region. The study results showed that the Yanchang Formation Chang_(4+5) Member in the Longdong region had material sources from the northeast,the southwest,the west and the south,and the distribution of rock type and lithic constituent in different source directions all exhibited a northeast- southwest difference. The cement type of reservoir was dominated by ferrocalcite,ankerite and kiesel; the particle size was finer,the sorting property was good,and the psephicity was dominated by subangularity.The petrologic characteristics of sandstone had a great influence on the diagenesis and physical property development of ultra low permeability reservoirs in the study area.

关 键 词：特低渗储层 岩石学特征 物源 长4+5 陇东地区 

分 类 号：TE122[石油与天然气工程—油气勘探]