The anomalies of high-precision geochemical exploration in well AT2 area of Tahe Oil Field, Tarim Basin and its geological significance for production
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摘要: 为了评价塔里木盆地塔河油田AT2井区三叠系中、上油组多个圈闭的含油气性，采用基于烃类微渗漏的高精度化探技术在该井区进行了油气地球化学精查研究。选用的地球化学勘探指标均为活动态指标，包括游离烃、物理吸附烃以及顶空气。采用测网方式采集了近地表土壤样品，网度为0.25 km×0.25 km，在重点圈闭上方采用了0.1 km×0.1 km加密采样网格。以游离烃甲烷、物理吸附烃甲烷、顶空气甲烷为代表性指标，研究了AT2井区地球化学异常特征。在此基础上，确定了5个综合地球化学异常区（对应于5个圈闭）。通过化探—地质双因素评价方法，对上述5个化探异常区进行了排序，评价了圈闭的含油气性，为油田滚动开发提供了地球化学依据。Abstract: To evaluate the hydrocarbon potential of multiple traps in the middle and up oil groups of Triassic, an intensive oil and gas geochemical exploration has been carried out in the well AT2 area of the Tahe Oil Field of the Tarim Basin by the means of hydrocarbon microseepage-based high-precision geochemical exploration techniques.The geochemical indicators selected for this study were all active ones, including soil gas, physical adsorbed hydrocarbon gas and headspace gas.Near-surface soil samples were collected by means of a 0.25 km×0.25 km measuring grid, with a 0.1 km×0.1 km measuring grid over some key traps.Soil gas methane, physical adsorbed methane, and headspace methane were selected as the representative geochemical indicators, and their geochemical anomaly features over the well AT2 area were studied.Based on which, five integrated geochemical anomaly zones (consistent with five traps) were determined.The five integrated geochemical anomaly zones were ranked using a double-factor evaluation method combining geochemical and geological exploration evaluation parameters, and the hydrocarbon-bearing potential of these traps were evaluated, providing a geochemical basis for oil and gas rolling development of the well AT2 area.
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图 1 塔河油田AT2井区三叠系中油组构造及化探部署
Figure 1. Tectonic structure and geochemical exploration area of middle oil group in Triassic, well AT2 area, Tahe Oil Field
图 2 塔河油田AT2井区地表游离烃甲烷浓度异常与三叠系中油组构造叠合图测区
范围为图 1中的矩形框区。
Figure 2. Superposition of near-surface free methane anomaly zones and middle oil group structures in well AT2 area, Tahe Oil Field
图 3 叠合法确定的塔河油田AT2井区地表综合地球化学异常
测区范围为图 1中的矩形框区。
Figure 3. Distribution of integrated surface geochemical anomalies determined by superposition method in well AT2 area, Tahe Oil Field
图 4 塔河油田AT2井区1号异常区样品烃类组构特征
Figure 4. Hydrocarbon composition of samples collected from No. 1 anomaly zone in well AT2 area, Tahe Oil Field
图 5 塔河油田AT2井区三叠系中油组区域构造、断裂、振幅、化探异常叠合图
测区范围见图 1。
Figure 5. Superposition of regional structures, fractures, seismic amplitude of Triassic middle oil group and surface geochemical anomaly zones in well AT2 area, Tahe Oil Field
图 6 塔河油田AT2井区西南三叠系上油组平均绝对振幅属性叠合顶面构造
测区范围见图 1。
Figure 6. Superposition of average absolute amplitude attribute and top structure of Triassic upper oil group in southwestern part of well AT2 area, Tahe Oil Field
图 7 塔河油田AT2井区化探异常双因素评价结果
Figure 7. Double-factor evaluation results of geochemical anomaly zones in well AT2 area, Tahe Oil Field
表 1 塔河油田AT2井区地表地球化学综合异常化探参数评价概率及评价结果
Table 1. Geochemical evaluation probability and results of integrated surface geochemical anomaly zones in well AT2 area, Tahe Oil Field
化探参数 异常编号 1 2 3 4 5 总贡献率G/% 100 100 100 80 100 异常衬率C－/% 92.97 100 81.96 74.92 80.12 烃类热成因概率R/% 100 95.16 100 100 100 化探评价概率P/% 97.60 98.36 93.58 84.31 92.88 评价排序 Ⅱ Ⅰ Ⅲ Ⅴ Ⅳ 
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表 2 塔河油田AT2井区综合化探异常的地质评价概率及评价结果
Table 2. Geological evaluation probability and results of integrated surface geochemical anomaly zones in well AT2 area, Tahe Oil Field
地质评价参数 异常编号 1 2 3 4 5 圈闭落实S/% 75 75 75 75 75 断裂F/% 75 75 50 75 50 振幅r/% 75 50 50 75 25 地质评价概率Z/% 75 65.52 57.24 75 45.23 地质排序 Ⅰ Ⅱ Ⅲ Ⅰ Ⅳ
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