第38卷第1期 2017年2月
文章编号：10013873(2017)01-0081-04
新疆石油地质
XINJIANG PETROLEUM GEOLOGY DOI:10.7657/XJPG20170114
Vol. 38,No.1 Feb.2017
轮南2油田JIV油藏水驱实验及微观剩余油分布特征
何巧林”，关增武"，左小军”，吴琳”，邢星·，黄兰”
（中国石油塔里木油田分公司a.勘探开发研究院；b.开发处，新疆库尔勘841000）
摘要：根据铸体薄片、常规物性、扫描电镜、压秉等分析结果，对塔里木盆地轮南2油田下保罗统阳霞组JIV油藏储集层孔隙结构类型进行了划分，选取主要的4类孔隙结构储集层进行砂岩碧心微观水驱实验。实验结果表明，不同孔隙结构储集层渗流特征不同，细喉低渗类和微细喉特低渗类储集层以指状渗流为主，较细喉高渗类储集层为指状一网状渗流，细喉中渗类储集层为网状一均匀渗流；水驱后微观剩余油以绕流形成的片状和簇状分市为主，其次为柱状、角状、
膜状等分散分市。通过分析不同孔隙结构类型储集层水驱油微观渗流特征，为油田有效合理开发提供依据。关键词：塔里木盆地；轮南2油田；水驱实验；孔豫结构；渗流特征；剩余油分布
中图分类号：TE327
文献标识码：A
WaterfloodingExperimentand Micro-Distribution of Remaining Oil in JIVReservoirin
Lunnan-2Oilfield
HE Qiaolin, GUAN Zengwu', ZUO Xiaojun', WU Lin', XING Xing, HUANC Lan'(PetroChina Tarim Oilfield Company, a. Research Institute of Exploration and Development;
b.Department of Development, Korla, Xinjiang 841000, China)
Abstract: Based on the analysis of cast thin-section, conventional physical properties, SEM and mercury injection, the pore structures of JIV reservoir of the Lower Jurassic Yangxia formation are classified, Microscopic waterflooding experiments for sandstone cores are carried out in the reservoirs with 4 main pore structures. The experiment results show that the reservoirs with different pore structures have differ-ent percolation features, Fine-throat, low-permeability reservoir and microfine-throat, super-low permeability reservoir are dominated by fin ger-like percolation, relative fine-throat, high-permeability reservoir by finger-like-net-like percolation and fine-throat, medium-permeabili-ty reservoir by net-like-uniform percolation, The remaining oil after waterflooding are mainly in sheet-like and cluster-like distributions re-sulted from by-pass oil with the secondary of scattered columnar, angular and film-like distribution. The analysis on micro-percolation fea-tures of waterflooding in reservoirs with different pore structures could provide basis for reasonable and efficient development of the oilfield. Keywords: Tarim basin; Lannan-2 oilfield; water flooding experiment; pore structure; percolation feature; remaining oil distribution
塔里木盆地轮南2油田阳霞组JIV油藏于1988年发现，2008年进人二次开发以来，80%以上的新井水淹，油藏采收率仅为24.5%.因此，查明储集层微观驱替机制、渗流机理及剩余油分布特征具有重要意义。
轮南2油田JIV油藏自投入开发以来，对微观剩余油分布的研究甚少。本文通过砂岩岩心微观模型实验，结合常规物性、铸体薄片、毛细管压力、扫描电镜等测试数据，研究了JIV油藏不同孔隙结构储集层的微观渗流特征和微观剩余油分布特征，旨在为油田
合理开发提供依据。 1区域地质背景
塔里木盆地轮南2油田下罗统阳霞组JIV油藏为一构造层状边水油藏，储集层为一套辩状河沉积，孔隙度3.6%~26.0%，平均17.8%，渗透率0.2~5980.0mD，平均300.3mD，属中孔中渗储集层，但垂向上非均质
性极强，渗透率变异系数1.68，突进系数5.60，级差达 24318，均质系数仅为0.17
储集层岩性主要为岩屑长石砂岩、长石岩屑砂岩，岩屑主要为酸性喷出岩，其次为变质岩。填隙物以黏土矿物（7.7%)和碳酸盐矿物（7.4%）为主，黏土矿物中高岭石含量最高，占黏土矿物总量的63.8%，以充填粒间孔隙螨虫状和散片状为主，偶见粒表状；其次是伊利石和绿泥石，少见伊蒙混层，未见蒙脱石。孔隙类型主要为粒间溶孔，其次为残余粒间孔，少量晶间孔和微裂缝。
储集层孔隙结构分类 2
根据石油天然气行业标准SY/T6285—2011《油气储层评价方法》。轮南2油田JIV油藏储集层孔隙结构可划分为7类(表1),其中以Ⅲz，Ⅲd,IVtd和IIg 等4类孔隙结构为主，占储集层总量的88.9%.从铸体
修订日期：2016-10-17
收稿日期：2016-07-14
作者简介：何巧林（1984-），女，四川盐亭人，工程师，硕士，沉积储集层，（Tel)13565058491(Email）hegl-tlm@petrochina.com.en 万方数据