芳香族分子示踪在海洋油气勘探中的开发和应用

苯 (benzene)、甲苯 (toluene)、乙苯 (ethylbenzene)和二甲苯 (xylene) (缩写为BTEX)等单环芳烃化合物是原油的主要成分。地层水中苯的痕量分布作为油气藏分子示踪的研究 ,得到国外石油地球化学家们的广泛重视。Burtell等人利用测试海洋石油钻井附近地层水中苯系化合物的含量确定新井位 ,在海洋油气资源勘探方面获得了巨大成功。文中主要介绍了国内在海洋石油勘探的随钻检测和面积化探中应用该类指标的效果和相关方法。通过渤中凹陷试验区取得的地球化学成果 ,验证并揭示了芳香族化合物中分子量级的BTEX指标与油气藏的关系。BTEX指标异常与油气藏直接相关 ,与烷烃类指标相比具有高分辨、高精度特点 ,是有价值的海洋油气地球化学勘探指标。BETX指标应用的关键是高精度测试出样品中芳香族化合物的分子级含量 ,激光单原子高技术为该技术的应用提供了技术保证。在油气资源勘探中 ,利用此指标 ,结合测井、地震等地球物理方法综合分析研究可以减小多解性 ,获得较好的预测效果。

Study and application of BTEX molecular tracer for the oil and gas resources prospecting in oceans

Monocyclic aromatic compounds such as, benzene, toluene, ethylbenzene, and xylene, abbreviated as BTEX, are main components of oil and gas reservoir. Geochemists paid more attention to the study of reservoir molecule tracing with the trace amount distribution of BTEX in formation water. In this paper, the BTEX indicator was applied to marine oil and gas resource exploration, which was measured from cuttings samples of returned slush in well and area samples of marine bottom sediment. On the basis of the measuring results in Bozhong depression study region, authors revealed the relationship between BTEX and reservoir. The BTEX anomaly is directly related to reservoir and gives higher resolution and accuracy than paraffin indicators, which is a valuable geochemistry indicator for marine oil and gas resource exploration. The key problem for the application of BTEX indicator is to measure the content of aromatic series compound on molecular level. Laser single atom-molecule technology guarantees its application. In oil and gas resource exploration, the BETX indicator, combined with comprehensive analysis from well logging data and seismic data, will reduce the number of solutions so as to provide better prediction results.