﻿ 基于双“泥质指示因子”的砂泥岩薄互层饱和度模型

1. 中石化胜利石油工程有限公司测井公司, 山东东营 257096;
2. 中国石油大学(华东)地球科学与技术学院, 山东青岛 266580

Thin Sand and Mudstone Interbed Saturation Model Based on a Dual Mudstone Indicator
Zhang Jinyan1, Liu Haihe1, Liu Wei1, Sun Jianmeng2, Zhao Jianpeng2
1. Well Logging Company, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong, 257096, China;
2. School of Geosciences, China University of Petroleum(Huadong), Qingdao, Shandong, 266580, China
Abstract:The resistivity of thin sand and mudstone interbeds is affected by mudstone, so that oil saturation calculated directly by Archie equation is lower. The reservoir can be considered as a layered medium with cross distribution of various thin layers based on internal sedimentary structural characteristics of thin sand and mudstone interbeds. Considering common electric conduction effect of interlayer coupling and a mudstone layer, a horizontal-vertical dual mudstone indicator conductive equivalent model is proposed. Thus, a computation model is built for thin sand and mudstone interbed saturation. According to processing and analysis of actual logging data, the water saturation calculated from the model is 10% to 20% lower than that calculated by the Archie equation which is closer to core test data. Research results show that the new saturation model can reduce effects on water saturation calculation of inter-layer and intra-layer mudstone of thin interbeds. It is applicable logging data interpretation for thin sand and mudstone interbed as well as thick sandstone.
Key words: sandstone    mudstone    thin interbed    water saturation    mudstone indicator    log interpretation model

1 导电模型的建立

 图 1 砂泥岩薄互层导电模型 Fig.1 Thin sand and mudstone interbed conduction model
2 双“泥质指示因子”饱和度模型的建立

3 实例分析

A井地层为典型的滩坝砂薄互层，图 2为其测井曲线处理结果。从图 2中电成像测井图像可以看出，储层以砂泥岩薄互层为主，单层厚度薄，多层叠加。图 2中，利用双“泥质指示因子”饱和度模型和阿尔奇公式计算含水饱和度时，两者采用的地层水电阻率、孔隙度和a，b，m，n值都相同；杆状线为岩心分析所得含水饱和度。

 图 2 A井砂泥岩薄互层测井曲线处理结果 Fig.2 Processing results of thin sand and mudstone interbed logging curve in Well A

 图 3 B井泥质砂岩储层测井曲线处理结果 Fig.3 Processing results of sand-mudstone reservoir logging curve in Well B

4 结 论

1) 纵向上，采用纵向“泥质指示因子”分析砂泥岩薄互层层间泥岩和泥质砂岩(或砂岩)的耦合导电；泥质砂岩层内，采用横向“泥质指示因子”分析泥质对电性的影响；储层岩石电阻率是薄互层层间与层内泥质共同作用的结果。基于此，可以推导出砂泥岩薄互层岩石电阻率公式。

2 ) 双“泥质指示因子”砂泥岩薄互层饱和度模型考虑了薄互层的沉积结构，经试验分析数据对比验证，计算的储层含水饱和度更为准确。

3) 双“泥质指示因子”砂泥岩薄互层饱和度模型适用于具有电成像测井资料的含水饱和度计算，对于没有进行电成像测井的井，可以依据不同薄互层结构给定的经验系数计算，不过计算精度可能会受到影响。

 [1] 雍世和,张超谟.测井数据处理与综合解释[M].东营:石油大学出版社,1996:132-134. Yong Shihe,Zhang Chaomo. Logging data processing and comprehensive interpretation[M]. Dongying:Petroleum University Press,1996:132-134. [2] 赵国欣.改进的双水模型在曲堤油田低电阻油层中的应用[J].油气地质与采收率,2008,15(6):49-51. Zhao Guoxin. Application of an advanced dual water model to the low resistivity oil layers in Qudi Oilfield[J]. Petroleum Geology and Recovery Efficiency,2008,15(6):49-51. [3] 李剑浩.用混合物电导率公式改进双水模型的公式[J].测井技术,2007,31(1):1-3. Li Jianhao. An improvement in conductivity formula of dual water model with conductivity formula of mixture[J]. Well Logging Technology,2007,31(1):1-3. [4] 王斌,潘建国,尹路,等.基于双重孔隙结构的测井解释模型及应用[J].岩性油气藏,2013,25(4):68-72. Wang Bin,Pan Jianguo,Yin Lu,et al. Well logging interpretation model based on double pores and its application[J]. Lithologic Reservoirs,2013,25(4):68-72. [5] 王敏.碳酸盐岩储层含水饱和度模型发展及分析[J].西南石油大学学报:自然科学版,2013,35(5):31-40. Wang Min. Improvement and analysis of carbonate reservoir saturation model[J].Journal of Southwest Petroleum University:Science & Technology Edition,2013,35(5):31-40. [6] 刘伟,张德峰,刘海河,等.数字岩心技术在致密砂岩储层含油饱和度评价中的应用[J].断块油气田,2013,20(5):593-596. Liu Wei,Zhang Defeng,Liu Haihe,et al. Application of digital core technology in oil saturation appraisal of tight sandstone reservoir[J]. Fault-Block Oil and Gas Field,2013,20(5):593-596. [7] 张德梅,王桂萍,娄宪刚,等.测井曲线组合法求取泥质含量探讨[J].测井技术,2011, 35(4):358-362. Zhang Demei,Wang Guiping,Lou Xiangang,et al. On calculating the shale content with log curve combining method[J]. Well Logging Technology,2011,35(4):358-362. [8] 沈华.文安斜坡泥质含量计算方法研究[J].石油天然气学报,2010,32(6):410-411,428. Shen Hua. Shale content calculation method for Wen'an slope[J]. Journal of Oil and Gas Technology,2010,32(6):410-411,428. [9] 张晋言,孙建孟,刘海河,等.一种“双泥质指示因子”饱和度模型建立方法:中国,2013102800555260[P].2013-10-28. Zhang Jinyan,Sun Jianmeng,Liu Haihe,et al. The method of“double shale indicator”saturation model:CN,2013102800555260[P].2013-10-28.

#### 文章信息

Zhang Jinyan, Liu Haihe, Liu Wei, Sun Jianmeng, Zhao Jianpeng

Thin Sand and Mudstone Interbed Saturation Model Based on a Dual Mudstone Indicator

Petroleum Drilling Techniques, 2015, 43(02): 59-62.
http://dx.doi.org/10.11911/syztjs.201502011