渭河盆地氦气成藏条件分析及资源量预测  

The analysis of helium accumulation conditions and prediction of helium resource in Weihe Basin

作　　者：张文[1,2] 李玉宏[2] 王利[3] 赵峰华[1] 韩伟[2] 宋昌贵 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国地质调查局西安地质调查中心,陕西西安710054 [3]中国地质调查局资源评价部,北京100037

出　　处：《天然气地球科学》2018年第2期236-244,共9页Natural Gas Geoscience

基　　金：国家自然科学基金面上项目(编号:41572131);中国地质调查局矿产资源调查评价项目(编号:121201011000150014;12120113040300)

摘　　要：渭河盆地氦气资源量在计算原理和参数选取上存在较大争议。据此,统计了渭河盆地101件油气井和地热井样品的气体成分和氦同位素数据,分析了该盆地的氦气成藏条件,并在综合选取和评估各项参数的基础上,估算了渭河盆地氦气资源量。结果表明,钻孔样品氦气体积分数平均为1.50%,最高达9.23%;氦源岩、地下水系统、载体气和断裂是氦气生成、运移和成藏的控制条件,其中盆地南缘花岗岩体和盆地内部隐伏磁性体是盆地最主要的氦源岩;根据盆地内地热流体储量、气水比、氦气体积分数估算出盆地内氦气资源量为21.30×10~8 m^3;根据氦源岩有效面积、水循环深度、岩体密度、铀钍含量估算得出自花岗岩体形成、盆地断陷和储层形成后的生氦量分别为185.21×10~8 m^3、37.58×10~8 m^3和4.16×10~8 m^3。综合认为渭河盆地的氦气资源勘探前景良好。There are dispute on the calculation principle and parameters selection of helium resource prediction in Weihe Basin.Here gas compositions and helium isotopes data of 101 oil gas wells and geothermal wells in Weihe Basin were collected;helium accumulation conditions analyzed;the helium resources calculated on the basis of comprehensive selection and evaluation of various parameters.The results showed that the volume fraction of helium is 1.50%in average and 9.23%to maximum.Helium source rocks,groundwater systems,carrier gases and fractures are the control conditions of helium production,migration and accumulation,in which the granite body in southern margin of the basin and concealed magnetic body interior basin are most likely the helium source rocks.Evaluation of helium resources in Weihe Basin are as follows：（1）the helium resource is calculated to be 21.30×10^8m^3 on the basis of the geothermal fluid reserves,the gas-water ratio,the volume fraction of helium gas;（2）according to the effective area of the helium source rocks,water cycle depth,rock density,uranium and thorium concentrations,the helium quantities produced since the formation of granite rocks,depression of the basin and formation of reservoir are 185.21×10^8m^3,37.58×10^8m^3 and 4.16×10^8m^3 respectively,showing the good helium resource prospect in Weihe Basin.

关 键 词：渭河盆地 氦气 成藏条件 资源量 

分 类 号：TE132[石油与天然气工程—油气勘探]