微量元素方法在地表油气化探中的试验研究——以川西新场气田为例

EXPERIMENTAL STUDY ON TRACE ELEMENT METHOD IN SURFACE GEOCHEMICAL PROSPECTING FOR OIL AND GAS

王国建 程同锦 王多义

Wang Guojian Cheng Tongjin Wang Duoyi

中国石化, 石油勘探开发研究院, 无锡石油地质研究所, 江苏, 无锡, 214151 2. 成都理工大学, 能源学院, 成都, 610059

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China 2. College of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China

在证实四川盆地西部新场气田上方存在烃类微渗漏现象的基础上,于该区开展微量元素与有机地球化学测量,研究了土壤中微量元素指标与有机地球化学指标的相关性及其与油气微渗漏的关系。新老资料的对比研究反映了微量元素指标的稳定性和对油气的指示意义。根据多元统计,结合已知气田上方微量元素反映油气异常的效果,认为Cl、S、V、Ni、Cu、Zn、Sb、Cr、Co、Ba、Mo、Mn、Fe、Fe/Mn、V/Ni等微量元素指标与气田区存在着响应关系,为该区预测天然气的有效指标。同时对新场气田上方微量元素指标异常特征的地质意义进行了探讨。优选已知气田上方的微量元素有效指标组合对于今后在该区进行大面积的油气远景评价,具有指导和现实意义。

Based on confirming the existence of hydrocarbon microseepage over Xinchang gas field in west of Sichuan Basin,surface trace element survey and hydrocarbon geochemical exploration were conducted in this area.The relationship between trace elements and surface geochemical indicators with hydrocarbon microseepage were studied.Some trace elements were proved to have stability and indicative significance to oil and gas by comparing the new data with previous ones.According to multivariate statistics and combining with the effects of microseep anomaly reflected by trace elements in surface soil over the known gas field,it is thought that trace element indicators Cl,S,V,Ni,Cu,Zn,Sb,Cr,Co,Ba,Mo,Mn,Fe,Fe/Mn and V/Ni are effective for gas-prospect evaluation in this area because of the respondence to the gas field.Moreover,the geologic significance of the characteristics of trace elements anomaly was discussed.The effective indicators optimized in the known gas field are of certain directive significance and important immediate significance to perspective assessment of oil and gas in large area for the future.

国土资源大调查项目(1212010310302)

https://doi.org/10.11781/sysydz200505544