第37卷第4期 2016年8月
文章编号：10013873(2016)04-0401-08
新疆石油地质
XINJIANGPETROLEUM GEOLOGY DOI:10.7657/XJPG20160404
Vol. 37,No.4 Aug,2016
准噶尔盆地西北缘中二叠统一下三叠统砂砾岩
孔隙结构类型及其控制因素
陈能贵，郭沫贞，孟祥超
（中国石油杭州地质研究院实验研究所，杭州310023）
摘要：孔隙结构类型及其控制因素是砂砾岩类储集层研究的一项难点，也是砂砾岩储集层评价和预测的基础。基于高精度CT成像扫描、岩心物性分析及试油试采等资料，结合砂砾岩岩矿特征，对准需尔垒地西北缘中二叠统一下三受统砂砾岩孔隙结构类型及其控制因素进行了研究，建立了利用孔原喉道半径、孔隙度和渗透率划分砂岩孔腺结构的标准，将研究区砂砾岩孔隙结构划分为较优、中等、较差及致密4类，并建立各类孔隙结构的三维定量孔腺结构数值模型。研究表明，砂砾岩的孔隙结构类型主要受泥质含量、火山岩岩含量、压实作用和胶结作用控制，其中泥质含量及火山岩岩屑含量是控制砂殊岩孔隙结构的主要因素。随着泥质含量和火山岩岩肩含量的增加，压实作用和胶结作用增强，砂砾岩的孔隙结构变差。较优一中等孔隙结构的砂砾岩主要发育于牵引流沉积的扇三角洲平原的辫状河道和扇三角洲前缘的水下分流河道中；较差孔隙结构的砂砾岩主要发育于扇三角洲碎属流中；致密孔隙结构的砂砾岩发育于富泥的扇三角洲分流河道和砂体顶、底的强胶结带中。
关键词：准噶尔垒地：西北缘；中二叠统：下三叠统；砂砾岩；孔隙结构；控制因素；数值模型
中图分类号：TE112.2
文献标识码：A
Pore Structures and ControllingFactorsof MiddlePermian-LowerTriassic Sandy
ConglomeratesinNorthwesternMarginofJunggarBasin
CHEN Nenggui, GUO Mozhen, MENG Xiangchao
(Institute of Experiment, Hangzhou Research Institute of Petroleum Geology, PetroChina, Hangzhou, Zhejiang 310023, China)
Abstract: Pore structure types and the controlling factors are difficulties in sandy conglomerate reservoir research and also the basis for sandy conglomerate reservoir evaluation and prediction. Based on the data of high-resolution CT imaging scanning, petrophysical properties of cores, formation and production tests, and integrated with petrological-mineralogical characteristics of sandy conglomerate, a research on pore structures and the controlling factors is carried out for Middle Permian-Lower Triassic sandy conglomerate reservoirs in northwesterm marginof Junggarbasin Standards forpore stuctureclassification in sandy conglomerate reservoirs arestablished using pore throat radi-us, porosity and pemeability, then the pore structures in the study area are divided into 4 types such as good, medium, poor and tight pore structures, and 3D quantitative pore-structure numerical models are established for each kind of pore structure, The result shows that the pore structures of the sandy conglomerate reservoirs are mainly controlled by shale content, debris content of volcanic rocks, compaction and cementation, among which the former two are dominant controlling factors. With the increase of shale content and debris content of vol-canic rocks, compaction and cementation become stronger and pore structures become poorer, Sandy conglomerate with good-medium pore structures mainly occurs in the braided-channel of fan-delta plain and underwater distributary channels of fan-delta front in tractive current depositions; that with poor pore structures develops in the debris flow of fan delta; that with tight pore structures occurs in mud-rich fan-delta distributary channel and strong cemented zone of the tops and bases of sandbodies.
Keywords: Junggar basin; northwest margin; Middle Permian; Lower Triassie; sandy conglomerate; glutenite; pore structure; controlling
factor; numerical model
储集层孔隙结构是确定储集层物性下限和评价储集层的关键参数，孔隙结构不仅控制油气储集性能及流体流动能力，而且控制油气并的产能和最终采收率。目前对储集层孔隙结构研究的方法主要有毛细管压力曲线法、薄片二维定性-半定量分析法、薄片-岩心三维定量分析法和测井定量分析法4类。毛细管压力曲线法可定性和定量地研究储集层的孔隙结
收稿日期：201603-09
修订日期：2016-04-18
基金项目：国家973项目（2014CB239002）
构-号；薄片二维定性-半定量分析法是利用铸体薄片-偏光显微镜、扫描电镜（SEM）、背向散射电镜（BSEM）、聚焦离子束电镜（FIB-SEM）、场发射扫描电子显微镜(FESEM)等技术，通过岩石成像可在二维上识别出储集层岩石的孔隙类型、喉道类型，测定出孔隙半径和喉道半径等参数"，可对纳米级孔隙和喉道进行高清成像和微观定量分析；薄片-岩心三维定量
作者简介：陈能贵（1963-），男，浙江临安人，高级工程师，石油地质，（Tel)0571-85224927(Email)chenng_hzpetrochina.com.cn 万方数据