塔中地区中深1C井寒武系原油低聚硫代金刚烷含量分析

中深1井、中深1C井在塔里木盆地寒武系盐下获得油气突破，中寒武统阿瓦塔格组（∈₂a）和下寒武统肖尔布拉克组（∈₁x）原油在地球化学特征上存在较大差异。对中深1井 ∈₂a原油和中深1C井∈₁x原油进行银盐离子柱色层分离，获得含硫非烃，使用气相色谱—质谱方法在中深1C井原油含硫非烃检测出完整的低聚硫代金刚烷系列，包括硫代单金刚烷、硫代双金刚烷和硫代三金刚烷系列，分析了26个化合物的质谱特征，并与文献质谱特征进行对比。除了含有[M-SH]和[M-CH ₃+]特征离子外，硫代金刚烷具有较强的分子离子，分子离子为硫代双金刚烷和硫代三金刚烷的基峰。使用D₁₆-单金刚烷作为定量内标，中深1井、中深1C井寒武系原油中低聚硫代金刚烷含量分别为7.36μg/g、8 758.02μg/g，表明中深1C井肖尔布拉克组原油为强烈硫酸盐热化学还原作用(TSR)的残余油，而中深1井阿瓦塔格组原油基本未受TSR作用。中深1C井原油极高的金刚烷和二苯并噻吩系列化合物含量分别为83 872.20μg/g和57 212.5μg/g，而中深1井原油中金刚烷和二苯并噻吩系列化合物含量仅为2 180.27μg/g和421.3μg/g，进一步支持中深1C井寒武系原油经历了强烈的TSR作用。中深1C井肖尔布拉克组油气藏温度大于160℃，地层水中丰富的SO^2-₄、Mg²⁺为油气藏中的原油发生强烈TSR提供了条件。

Concentrations analysis of lower thiadiamondoids of Cambrian oil from Well Zhongshen 1C of Tazhong Uplift,Tarim Basin,NW China

A breakthrough of deep petroleum exploration was achieved in the Cambrian pre-salt intervals of Wells ZS1 and ZS1C.However,the ZS1 oil from Awatage Formation of Middle Cambrian and ZS1C oil from Xiaoerbulake Formation of Lower Cambrian show great differences in the geochemical characteristics.Using sliver nitrate-impregnated silica chromatographic column,the sulfur-bearing non-hydrocarbon fractions were separated from the oils of Wells ZS1 and ZS1C.The complete lower thiadiamondoids series,including thiaadamantanes,thiadiamantanes and thiatrimantanes,were detected in ZS1C oil.The mass spectrum of over 26 compounds were analyzed and compared with the literatures.Except having [M-SH] and [M-CH⁺₃] characterized ion,the lower thiadiamondoids have strong molecular ion,which is the base peak for the thiadiamantanes and thiatriamantanes.Using D₁₆^- adamantane as an internal standard,the lower thiadiamondoids concentrations of oils from Well ZS1 and ZS1C were 7.36μg/g,8 758.02μg/g respectively,suggesting that the ZS1C oil had suffered serious thermochemical sulfate reduction (TSR),whereas the degree of TSR of ZS1 oil is negligible.The concentrations of diamondoids and dibenzothiophene series (DBTs) of ZS1C oil were 83 872.20μg/g,57 212.5μg/g respectively,whereas the concentrations of diamondoids and DBTs of ZS1 oil from were only 2 180.27μg/g and 421.3μg/g,further support that the ZS1C oil is a residual oil of serious TSR alteration.The reservoir temperature of ZS1C from Xiaoerbulake Formation greater than 160℃,combined abundance concentration ions of SO^2-₄ and Mg^2+in the formation water,both provided advantage condition for the ZS1C oil in the reservoir suffered the severely TSR.