Determination of BTEX Compounds in Core Samples by GC/MS

Benzene, toluene, ethylbenzene, xylene (BTEX) compounds in core samples which were at different depth and at the same well (QK-17-9-3) were determined by gas chromatography/mass spectrometry. The core samples were processed using Chinese oil and gas trade standard SY/T 5118-1995 and SY/T 5119-1995, and the components of aromatic hydrocarbons were obtained. The qualitative and quantitative determination methods for standard samples were developed using selected ion scanning module. The detection limits for all benzene homologues determined were 0.5 mg/L and the recovery of standard addition was in the range of 93.6% ～109.5%. The results show that the content of benzene and toluene was at the range of 1.4～ 111.7 ng/g. However, ethylbenzene and xylene were not detected. The results are important for marine oil chemical exploration.