基于流动单元的致密砂岩气储层渗透率测井评价——以川中广安地区须家河组为例

doi:10.3969/j.issn.1673-8926.2017.06.010

岩性油气藏 ›› 2017, Vol. 29 ›› Issue (6): 76–83.doi: 10.3969/j.issn.1673-8926.2017.06.010

基于流动单元的致密砂岩气储层渗透率测井评价——以川中广安地区须家河组为例

陈志强¹, 吴思源¹, 白蓉², 雷刚³

1. 西南石油大学地球科学与技术学院, 成都 610500;
2. 中国石油西南油气田公司勘探开发研究院, 成都 610041;
3. 中国石油青海油田测试公司, 甘肃敦煌 736202

收稿日期:2017-05-13 修回日期:2017-08-17 出版日期:2017-11-21 发布日期:2017-11-21
第一作者:陈志强(1993-),男,西南石油大学在读硕士研究生,研究方向为致密储层特征及其测井评价方法。地址:(610500)四川省成都市新都区新都大道8号。Email:923072402@qq.com。
基金资助:
大型油气田及煤层气开发国家重大科技专项"四川盆地大型碳酸盐岩气田开发示范工程"（编号：2016ZX05052）资助

Logging evaluation for permeability of tight sandstone gas reservoirs based on flow unit classification:a case from Xujiahe Formation in Guang' an area,central Sichuan Basin

CHEN Zhiqiang¹, WU Siyuan¹, BAI Rong², LEI Gang³

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
3. Test Company, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China

Received:2017-05-13 Revised:2017-08-17 Online:2017-11-21 Published:2017-11-21

摘要/Abstract

摘要： 四川盆地广安地区须家河组致密砂岩气储层非均质性极强，使得孔隙度与渗透率相关性差，难以通过单一的孔隙度与渗透率回归模型准确计算渗透率。因此，利用859块标准柱塞样物性分析数据，根据流动单元指数（FZI）由小到大，划分出了5类流动单元，并建立了相应的孔隙度与渗透率统计回归模型，每种类型流动单元的孔隙度与渗透率相关性良好。为了使用这组分类统计模型，需要连续的FZI来划分整个目的层段的流动单元类型。为此，选择了20块典型样品开展高压压汞与核磁共振联测实验。基于联测实验数据，得到了利用核磁共振测井计算Swanson参数、利用Swanson参数计算储层品质因子（RQI）、利用RQI计算FZI的转换模型，实现了FZI的连续定量评价，最终实现了研究区致密砂岩气储层流动单元类型的连续划分及其渗透率的测井评价。现场应用结果表明：利用核磁共振测井计算FZI与岩心分析FZI较为接近，该方法可有效解决FZI连续定量评价的问题；相比于单一的孔隙度和渗透率回归模型与核磁Coates模型，流动单元分类的渗透率计算结果与岩心分析渗透率吻合度更高，该方法有效地提高了渗透率测井评价的准确度。上述方法在类似的致密砂岩气储层渗透率测井评价中具有推广价值。

关键词: 储集层, 层序地层, 白云岩化作用, 飞仙关组, 下三叠统, 达川-万县地区

Abstract: Strong heterogeneity exists in the tight sandstone gas reservoirs of Xujiahe Formation in Guang' an area, central Sichuan Basin, which leads to poor correlation between porosity and permeability. It is difficult to calculate the permeability directly by using a single regression model. Therefore,physical property data from 859 standard plunger cores,the reservoir was divided into five types of flow unit according to Flow Unit Index(FZI)from small to large,the corresponding regression models were established,and there was a good correlation between porosity and permeability in each type of Flow Unit. In order to make the established models for every type of flow unit available in estimating permeability in the whole intervals in field application,the consecutive FZI should be first obtained to classify formation. Therefore,20 typical samples were selected to carry out Nuclear Magnetic Resonance(NMR)and mercury injection experiment. On the basis of experiment data, conversion models between T₂ geometric mean(T_{2 lm})and Swanson parameter, Swanson parameter and reservoir quality index (RQI),RQI and FZI were established. Models of calculating the key factor of RQI in expression of FZI estimation formula were established,and then a credible technique of extracting FZI consecutively from NMR logs was proposed, which ensures the credibility of formation classification by using the predicted FZI. Finally, continuous division of flow unit and logging evaluation for permeability of tight sandstone gas reservoirs in the study area were succeeded. Application results show that the FZI calculated by NMR log calculation is consistent with core analysis FZI, and NMR log can effectively solve the problem of continuously quantitative evaluation of FZI. Compared with single regression model and NMR Coates model,permeability value calculated by the classification of flow unit is more consistent with core analysis,this method can effectively improve the accuracy of permeability logging evaluation. This method can be used in tight gas reservoir evaluation and deliverability prediction directly.

Key words: reservoir, sequence stratigraphy, dolomitization, Feixianguan Formation, Lower Triassic, Dachuan-Wanxian area

中图分类号:

P631.8

陈志强, 吴思源, 白蓉, 雷刚. 基于流动单元的致密砂岩气储层渗透率测井评价——以川中广安地区须家河组为例[J]. 岩性油气藏, 2017, 29(6): 76–83.

CHEN Zhiqiang, WU Siyuan, BAI Rong, LEI Gang. Logging evaluation for permeability of tight sandstone gas reservoirs based on flow unit classification:a case from Xujiahe Formation in Guang' an area,central Sichuan Basin[J]. Lithologic Reservoirs, 2017, 29(6): 76–83.

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基于流动单元的致密砂岩气储层渗透率测井评价——以川中广安地区须家河组为例

Logging evaluation for permeability of tight sandstone gas reservoirs based on flow unit classification:a case from Xujiahe Formation in Guang' an area,central Sichuan Basin

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