GEOGAS ANOMALY AND MECHANISM IN XUANHAN GAS FIELD
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摘要: 地气测量在反映金矿的深部盲矿方面, 取得了很好的试验效果.为扩大应用范围, 在已知气田进行试验, 其结果能够反映4 000 m深的环状断裂构造, 异常位置在构造的垂直上方.另外, 土壤中有2组微量元素异常, 间接指示了含气范围.此外, 进行了多种扫描探针显微术观测, 发现采样器上沉积的物质是以纳米微粒及其集合体形式存在的, 为地气异常形成机理研究提供了证据.Abstract: Geogas prospecting is an effective method for the location of the concealed gold deposit. In order to popularize this method, many experiments have been made in the known gas fields. The geogas prospecting has thus revealed the ring fracture structure 4 000 m deep and the location of the geogas anomaly above the ring fracture structure perpendicular to each other. In addition, two groupsof trace element anomalies in the soil, indirectly indicate the gas_bearing range. Finally, several kinds of high_resolution scanning-probe microscopes have been employed to observe the geogas anomaly. The results show that the substance deposited on the collectors occurs in the forms of nano-scale particles and their aggregate, providing us with the evidence for the research into the mechanism of the geogas anomaly.
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Key words:
- geogas prospecting /
- nanoscale particle /
- oil and gas field /
- geogas anomaly /
- trace element
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图 1 四川省宣汉五宝场地区构造简图
1.背斜、复背斜; 2.隐伏大断裂; 3.环形构造
Fig. 1. Structural sketch map in Wubaochang area, Xuanhan County, Sichuan Province
图 2 四川省宣汉气田1线地气异常综合剖面
Fig. 2. Geogas anomaly in the prospecting line 1, Xuanhan gas field, Sichuan Province
图 3 宣汉气田地气法及含气指示元素研究成果
1.钻井; 2.环形构造; 3.测线及测点; 4.地气异常范围; 5.含气范围
Fig. 3. Positive result of geogas prospecting and gas_bearing indicating elements, Xuanhan gas field
图 4 四川省宣汉气田1线土壤中与地气异常相应元素质量分数分布
Fig. 4. Distribution of mass fractions of trace elements in soil with geogas anomaly in the prospecting line 1, Xuanhan gas field, Sichuan Province
图 5 四川省宣汉气田1线土壤中微量元素异常剖面
Fig. 5. Trace elements anomaly of soil in the prospecting line 1, Xuanhan gas field, Sichuan Province
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