地质勘探
天然气勘探与开发
2017年9月出版
数字岩心结合成像测井构建裂缝一孔洞型储层孔渗特征
李隆新常程徐伟鄱友军杨柳邓惠
中国石油西南油气田公司勘探开发研究院
摘要针对碳酸盐岩气荔储层由于缝利发育导致孔隙度、渗透率相关性差的问题，基于四川盐地安岳气田高石梯一磨溪区块裂缝一孔凋型储层岩心的CT扫描图像和储层段的成像测井资料，通过重构岩心内部的三维结构，提取岩心中缝利结构参数，划分缝洞模式，开展数字岩心流动模拟和渗透率计算，认识不同孔隙度区问渗透率的分布规律，描述裂缝一孔稠型储层的孔渗特征。研究结果表明：①碳酸盘岩岩心中毫来一厘米级小型率润是主要的储集空间，占孔隙体积的68%，开度介于0.1～0.6mm的扁平状小裂缝在局部构成缝网，缝调搭配形成优势渗流通道是提高岩心渗透率的关键；①结合成像测并资料，可将储层中缝桐发育模式划分为4种，在孔隙度大于3%的储层中，当面洞率大于10%或面缝率大于0.02%时，储层的渗透性能有显著提商。
数宇岩心面调率面缝率重构
关键词
CT成像
DOI: 10.12055/gaskk.issn.1673-3177.2017.03.002
成像测并
碳酸盐岩
裂缝一孔润型储层
Reconstructionofporosityandpermeabilitycharacteristicsoffracture-vugreser-
voirs by using digital core together with imaging logging
Li Longxin, Chang Cheng,XuWei,YanYoujun,YangLiu,DengHui
(Exploration andDevelopmentResearch Institute,PetroChinaSouthwest Oil& Gas Field Company,Chengdu,Sich uan 610041,China)
Abstract: The development of fractures and vugs leads to the poor correlation between porosity and permeability of carbonate gas reservoirs. To solve this problem, the internal 3D structure of cores was reconstructed by using the CT scanning images of cores taken from the fracture-vug reservoirs in the GaoshitiMoxi block of Anyue Gasfield, Sichuan Basin and the imaging logging data of res-seaaeaee simulation was performed on digital core and the permeability was calculated. Finally, the distribution laws of permeability in differ-ent porosity intervals were figured out and the porosity and permeability characteristics of fracture-vug reservoirs were described. It is shown that in the cores of carbonate rocks, vugs of mm-cm level are the main reservoir space, accounting for more than 68% of the to-tal pore volume. Small flat fractures with aperture of 0.10.6 mm form fracture network locally. Predominant pathway which consists aenneaeaese into four patterns. When layer porosity is more than 3% and the vug rate is greater than 10% or fracture rate is greater than 0.02%, the permeability can be improved obviously
Keywords: Digital core; Vug areal rate; Fracture areal rate; Reconstruction; CT imaging; Carbonate rock; Fracture-vug reservoir
碳酸盐岩储层在沉积、成岩、构造作用的共同影响下，形成了不同尺度的溶孔、溶洞和裂缝[1-5]，导致储层孔隙度与渗透率相关性差(6-7，气井产能与钻遇储层孔隙度没有明显的相关关系，气藏储层评价和开发有利区优选的难度远大于常规砂岩气藏。研究缝洞发育特征对储层物性参数的影响，描述储
层复杂孔渗特征，对碳酸盐岩气藏的高效开发具有十分重要的意义。近年来，数字岩心技术受益于计算机运算速度和存储量的大幅度提高，在应用范围和分析尺度上得到了显著提升，从单一的毫米级小样孔喉结构分析向岩心尺度的储集空间特征分析和更具实际意义的渗流模拟拓展8-，具有可视化、
基金项目：国家科技重大专项课题“深层碳酸盐岩气激高效开发技术”（编号：2016ZX05015-003-03)。
第一作者：李隆新，1984年生，工程师，博士：主要从事油气田开发及渗流力学研究工作。地址：（610041）四川省成都市高新
区天府大道北段12号，电话：（028）86015042E-mail：lilongxin@petrochina.com.cn· 16 ·
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