Application of the mobile form indicators ingeochemical prospecting of hydrocarbons in Yubei area, Tarim Basin
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摘要: 塔里木盆地玉北地区地质条件复杂,地表为沙漠地貌,多流动沙丘,地震信号因沙漠地表吸收衰减严重,资料信噪比和分辨率低,勘探难度大。油气化探的活动态方法不受沙漠区影响,可以探测下伏的油气信息,具有直接、快速、经济的特点。选择游离气、顶空气、荧光光谱、微生物等活动态方法在塔里木盆地玉北地区进行勘探应用。应用结果表明:活动态方法中甲烷氧化菌、丁烷氧化菌等微生物指标异常区及综合指标(熵值)异常区可有效指示玉北1井区的油气范围;依据这些指标异常的空间组合及配置关系在研究区圈定了6个化探异常有利区,同时划分了它们的综合异常级别,其中玉北1号构造破裂带是本工区油气勘探最有利的目标区,玉北1号构造破裂带边缘区亦是本工区油气勘探较有利的目标区。上述结果为塔里木盆地玉北地区油气勘探部署提供了地球化学依据。Abstract: The Yubei area in Tarim Basin is characterized by complex geological conditions and desert land form with widely distributed mobile sand dunes. Seismic signals are severely attenuated in the area due to the absorption by desert surface, leading to a low signal-noise ratio and low resolution of data and thereby making hydrocarbon exploration difficult. The method using mobile forms for geochemical prospecting of hydrocarbons is not affected by the desert land form and can detect information of underlying hydrocarbons in adirect, rapid, and economic manner. The mobile form indicators of free hydrocarbon gas, headspace gas, fluorescence spectra, and microorganisms were selected for the geochemical prospecting of hydrocarbons in the Yubei area, Tarim Basin. The results are as follows. The anomaly zones of the methane,butane oxidizing bacteria and the integrated indicators (entropy) can effectively indicate the hydrocarbon-bearing scope of the area controlled by Well Yubei-1. Based on the spatial combination and configuration relationship of the anomaly zones of these indicators, six favorable zones of geochemical anomalieswere delineated, and their integrated anomalous levels were determined. Among these favorable zones, the tectonoclastic zone of Well Yebue-1 is the most favorable target area for hydrocarbon exploration, followed by the marginal regions of the tectonoclastic zone. These results provide a geochemical basis for further deployment of hydrocarbon exploration in the Yuebei area, Tarim Basin.
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