SIMULATION EXPERIMENT OF THE GEOCHROMATOGRAPHIC EFFECT OF AROMATIC HYDROCARBONS DURING HYDROCARBON EXPULSION
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摘要: 为考察芳烃系列地质色层效应,利用未混油或混油源岩样品在低温、加压条件下对块状暗色泥岩及灰质泥岩样品进行排烃模拟实验,实验样品来源于渤海湾盆地东营凹陷坨73井沙三下段3160m处泥岩及梁斜61井沙四上段2432m处灰质泥岩,两块样品有机碳含量分别为3.08%和4.0%,成熟度指标Ro分别为0.42%和0.45%。实验结果显示,芳烃系列地质色层效应强弱与芳烃化合物分子量大小呈正相关关系,分子量越大,运移能力越弱,地质色层效应越不明显;排烃过程造成萘等低分子量系列离子流含量整体升高,而三芳甾烷等高分子量系列离子流含量整体下降;在系列内部,重排后的1,3,6-TMN(三甲基萘)较1,2,5-TMN容易运移,甲基取代菲比其对应的无取代基的母体菲难以运移,氧芴、硫芴及联苯系列内部各化合物相对含量变化较大,该系列化合物有关比值具有作为油气运移指标的潜力。Abstract: A simulation experiment has been conducted at a low temperature(150℃) and pressurized condition in order to study the geochromatographic effect of the aromatic compounds in the course of the hydrocarbon expulsion from the black mudstone strata and the calcilutyte strata.The samples used in the experiment are source rock samples with or without oil mixed,which were collected respectively from the mudstone strata at 3 160 m in the lower part of the 3rd Member of Shahejie Formation,Well Tuo-73 and the calcilutyte strata at 2 432 m in the upper part of the 4th Member of Shahejie Formation,Well Liangxie-61 in the Dongying Sag,the Bohai Bay Basin.The organic carbon content of the two samples are 3.08% and 4.0%,and the vitrinite reflectance(Ro) are 0.42% and 0.45% respectively.The results show that the geochromatographic effect is directly related to the molecular weight,since the high-weight molecular hydrocarbon is more difficult to migrate and the geochromatographic effect is thus more insignificant.The hydrocarbon expulsion causes the ion flow content of the light-weight hydrocarbon series,such as naphthalene,increase and the ion flow content of the high-weight hydrocarbon series,such as triaromtic sterane,decrease in the whole.While within the hydrocarbon series,the rearranged 1,3,6-TMN(trimethylnaphthalene) can migrate more easily than the 1,2,5-TMN,whereas the dethylphenanthrene migrates more difficultly than the mother phenenthrene;the relative contents of the compounds in dibenzofurans,dibenzothiophenes,and biphenyl series change greatly compared with the other series,and the related ratios of the compounds within the above hydrocarbon series are regarded as potential indicators of hydrocarbon migration.
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