A DISCUSSION ON WELL LOGGING INTERPRETATION METHOD: A CASE FROM PALEOGENE WENGCHANG AND ENPING FORMATIONS IN THE HUIZHOU DEPRESSION
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摘要:
惠州凹陷古近系文昌组、恩平组暗色泥岩既为生油岩也为盖层，其气测组分齐全且含量高，异常幅度常明显高于相邻储层段，对油气水识别造成很大的困扰，常规解释方法适用性较差，无法准确区分储层流体性质。计算全烃-流体类型图版是在总结不同流体类型实时流体录井(Fluid Logging & Analysis In Real time，简称FLAIR)组分特征的基础上，结合取样、测试结论进行数理统计分析，建立起的区域性解释图版。考虑到该图版对油层与含油水层的区分具有一定的局限性，通过统计凹陷内7口探井93个样品的地化岩石热解气相色谱图，归纳总结出油层、含油水层及水干层岩石热解气相色谱图特征差异。两种不同载体录井资料解释方法相结合，能够准确的对储层流体性质做出评价，现场实际应用效果较好，录井综合解释符合率达到88.5%。
Abstract:The Paleogene dark mudstone in the Wengchang and Enping Formations is not only a source rock, but also a cover layer for oil accumulation. It usually shows complete gas logging composition of higher content comparing to adjacent reservoirs, and always brings great trouble to the fluid evaluation. Conventional interpretation methods are not effective enough to distinguish the fluid properties. In this study, a regional interpretation chart for calculating total hydrocarbon-fluid types is built upon the characteristics of the FLAIR components for different fluid types, combined with sampling and testing data. There is certain limitation to distinguish oil from oil-bearing water. According to the gas chromatogram data for geochemical rock pyrolysis analysis for 93 samples from 7 wells in the depression, the characteristics are summarized in this paper for oil layers, oil-bearing water layers, water layers and dry layers respectively. To integrate the two logging interpretation methods based on different data carriers, reservoir fluid properties of the Paleogene can be accurately evaluated. The consistency of comprehensive logging interpretation method may reach 88.5%.
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表 1 惠州凹陷古近系已钻井泥岩与显示层FLAIR参数对比表
Table 1. Comparison of FLAIR parameters between mudstone and hydrocarbon display layer in Huizhou Depression
井名 井段/m 岩性 FLAIR流体组分/10-6 三角图版 皮克斯勒图版 完井解释结论 C1 C2 C3 iC4 nC4 iC5 nC5 nC6 nC7 nC8 C6H6 C7H8 C7H14 A1 3 902~3 906 泥岩 4 509 1 381 1 664 208 695 254 315 104 64 40 9 30 101 油层 油层 - A1 3 908~3 912 细砂岩 6 075 1 818 2 120 221 913 340 379 134 87 53 10 41 151 油层 油层 油层 A2 3 990~3 998 泥岩 4 878 1 523 2 157 221 849 287 291 118 71 30 6 15 97 油层 油层 - A2 3 998~4 003 细砂岩 6 918 2 462 2 079 147 780 250 323 136 71 32 8 27 115 油层 油层 油层 A3 3 935~3 940 泥岩 2 397 491 690 95 315 139 249 64 43 35 8 6 59 油层 油层 - A3 3 940~3 943 细砂岩 3 066 728 927 159 450 173 207 60 38 49 7 11 57 油层 油层 含油水层 A4 4 200~4 123 泥岩 4 599 1 107 1 400 117 557 201 235 109 61 18 4 10 75 油层 油层 - A4 4 213~4 218 细砂岩 3 744 1 335 1 677 139 638 209 260 125 69 37 12 21 112 油层 油层 水层 
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表 2 各井段FLAIR流体组分特征
Table 2. The characteristics of FLAIR fluid components in each well intervel
层号 FLAIR流体组分/10-6 计算全烃 流体类型 解释结论 C1 C2 C3 iC4 nC4 iC5 nC5 nC6 nC7 nC8 C6H6 C7H8 C7H14 ① 1 307 482.9 368.7 108.3 135.2 46.9 49.8 28.59 13.78 5.88 7.54 7.26 5.38 5 246 1.42 油层 ② 1 426 511.4 406.1 113.3 150.9 51 55.2 33.24 16.96 7.45 8.48 7.86 11.03 5 765 1.56 油层 ③ 1 323 478.5 369.1 95.7 137 44.5 48.3 28.18 16.43 9.35 8.48 7.27 10.8 5 265 1.66 油层 ④ 256 41.9 63.1 16.2 29.7 9 9.5 3.96 1.99 2.45 0.15 7.1 10.07 959.5 1.3 含油水层 ⑤ 449.2 62.8 105.9 15 38.5 10.7 12.2 10.82 4 2.05 0.45 7.63 10.86 1 436 2.21 含油水层 ⑥ 82.12 0 0 1 1 1 1 3.003 0.17 1.354 0.01 5.92 1.351 171 11.31 水层
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