新场气田土壤中纳米黄铁矿的发现及讨论  

THE DISCOVERY OF NANO-SIZE PARTICLE SULFUR ORES IN THE GROUND SOIL IN XINCHANG GAS FIELD AND ITS SIGNIFICANCES

作　　者：王多义[1] 刘亚伟[1] 邓美洲[1] 

机构地区：[1]成都理工大学

出　　处：《天然气工业》2005年第11期14-16,24,共4页Natural Gas Industry

摘　　要：四川盆地西部新场气田地表土壤中发现了纳米微粒黄铁矿,利用单偏光显微镜、电子显微镜和能普仪等对其进行观察分析,发现黄铁矿微粒直径为0.06～0.3μm,并聚集成椭球体,故称其为纳米微粒球状黄铁矿。利用中子活化法和原子力显微镜等对土壤中气体和天然气中非烃类元素的种类、含量和形态进行观察分析,发现井场附近土壤中烃类的含量高出该区土壤样品平均含量的数百倍。最终认为:①纳米微粒黄铁矿的产生与天然气泄漏和烃类渗漏作用密切相关;②今后该纳米微粒黄铁矿可以作为一种天然气藏存在的标志性矿物;③天然气泄漏使生态环境受到严重的影响。该发现为油气勘探地球化学法提供了新的依据。研究结果表明应当立即关注天然气泄漏对生态环境的负面影响。The nano-p sulfur ores are discovered in the ground soil in Xinchang gas field of the west part in Sichuan Basin. Through observing with nicol microscopy, electron microscopy and spectrum analyzer, it is found that the sizes of the sulfur ores are about 0.06-0.3 μm and gather into oval, so named nano-p spherical sulfur ores. The types, contents and shapes of the non-hydrocarbon elements in the soil of the field are analyzed by neutron activation method with atomic microscopy, it is discovered that the hydrocarbon content in the soil nearby the well site is more than several hundred times of the average one in the area. The conclusion is as follows: ① the generation of the ores is closely relating to the hydrocarbon leakage; ② the ores can be considered as a sign of natural gas existence; ③ the natural gas leakage seriously influences the ecological environment. This discovery provides a new basis for hydrocarbon exploration by geochemical methods and more attentions should be paid to the negative influence on ecological environment caused by natural gas leakage.

关 键 词：四川盆地 西 新场气田 纳米微粒 球状黄铁矿 烃类渗漏 环境保护 

分 类 号：P618.31[天文地球—矿床学]