Application of Quantitative Grain Fluorescence Techniques to Fluid Identification in Tight Reservoir—A Case Study of Structure BZ-A in Huanghekou Sag
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摘要:
利用常规测井资料评价致密储层的含油气性往往具有多解性。根据储层定量荧光分析(QGF和QGF-E)的技术特点，将其应用于渤海海域黄河口凹陷BZ-A构造沙河街组储层中，结合测井解释和试油结果，探究该技术在致密储层流体识别中的应用效果。研究表明，通过QGF-E强度得出的BZ-A构造现今油水界面与测井解释的界面深度相近。研究区油水层的判别基准线约为70 pc，含油饱和度与QGF-E强度正相关，测井解释为油层段的样品QGF-E强度值绝大多数>70 pc，含油水层和水层段均小于该值。利用储层定量荧光技术建立了该区含油性判别标准并利用试油结论进行验证，有效识别出了沙一段上部干层段和测井资料遗漏的沙一段下部的致密油层，该技术可以为判别致密储层的流体性质提供新的方法支持。
Abstract:Conventional well logging data is not sufficient and effective for identification of tight oil reservoirs correctly. In this case of the Structure BZ-A in the Huanghekou Sag, quantitative grain fluorescence technique (QGF and QGF-E) is adopted, with the support of logging and testing data, to identify fluid properties in tight reservoirs of the Shahejie Formation on Structure BZ-A of the Huanghekou Sag. Results show that the current oil-water interface in well BZ-A-2 is close to the depth of well logging. The base line of oil layers is around 70 pc in the studying area. Therefore, most of the oil zones detected by well logging data is above 70 pc and all water layers are below 70 pc. Dry layers in the upper section of the Member Sha1 and oil zones in the lower section have been detected by QGF-E data, but missed in well logging data. In conclusion, the quantitative grain fluorescence technique is a new and effective mean for detecting hydrocarbon bearing layers in tight reservoir.
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Key words:
- QGF-E /
- QGF /
- tight reservoir /
- oil zone identification /
- Huanghekou Sag
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表 1 BZ-A-2井储层样品定量荧光实验分析数据
Table 1. The QGF and QGF-E analysis data of the samples of the well BZ-A-2
样品编号 取样深度/m 层位 岩性 QGF参数 QGF-E参数 测井解释结果 QGF index λmax/nm λmax/nm QGF-E/pc 1 3 727.5 砂岩 17.7 462 378 8.8 2 3 732.5 砂岩 20.8 461 374 60.8 3 3 747.32 砂岩 8.3 477 408 291.0 干层 4 3 751.66 砂岩 5.7 477 425 85.4 干层 5 3 760 沙一段 碳酸盐岩 20.5 454 382 683.4 油层 6 3 765 碳酸盐岩 7.5 469 386 175.4 油层 7 3 775 砂岩 9.3 469 388 284.7 干层 8 3 785 砂岩 9.3 457 376 338.0 干层 9 3 787 碳酸盐岩 7.0 473 372 66.2 干层 10 3 793.35 砂岩 5.3 479 380 95.4 11 3 795 砂岩 7.1 464 375 197.1 油层 12 3 805 砂岩 4.5 462 376 40.4 13 3 825 砂岩 15.7 453 381 72.7 油层 14 3 837.5 砂岩 11.0 467 378 16.2 15 3 845 砂岩 10.9 452 380 198.3 差油层 16 3 855 砂岩 23.1 471 380 309.1 17 3 867.5 砂岩 2.9 449 306 34.4 油层 18 3 872.5 砂岩 9.0 421 308 37.4 19 3 877.5 砂岩 5.5 461 379 124.4 油层 20 3 885 沙二段 砂岩 6.1 443 383 171.5 干层 21 3 887.5 砂岩 10.6 471 374 68.5 干层 22 3 890 砂岩 4.0 445 308 42.1 干层 23 3 895 砂岩 10.8 465 370 23.8 干层 24 3 903 砂岩 11.1 464 402 43.0 油水层 25 3 904 砂岩 13.0 468 372 67.4 油水层 26 3 910 砂岩 14.1 454 375 39.1 含油水层 27 3 915 砂岩 4.1 471 370 61.6 28 3 917.5 砂岩 11.5 447 376 50.9 
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表 2 黄河口凹陷BZ-A构造QGF-E判别含油性标准
Table 2. The QGF-E assessment criterion of detecting oil zones in the BZ-A Structure in Huanghekou Sag
QGF-E强度/pc 含油性 >70 油层 40~70 油水层、含油水层 < 40 水层/干层
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