芳烃地质色层效应的模拟实验

陈中红,等,石油实验地质，2007，29（6）：612-616

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3 160 m 处泥岩及梁斜61 井沙四上段2 432 m 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。

关键词:生物标志化合物;芳烃;地质色层效应;排烃;初次运移;模拟实验

中图分类号: TE122. 1 　　　　　　　　　　文献标识码:A

SIMULATION EXPERIMENT OF THE GEOCHROMATOGRAPHIC EFFECT OF AROMATIC HYDROCARBONS DURING HYDROCARBON EXPULSION

Chen Zhonghong , et al，Petroleum Geology and Experiment, 2007，29（6）：612-616

( Col lege of Earth Resource and Information , China Universi t y of Pe roleum , Dong y ing , Shandong 257061 , China)

Abstract : A simulation experiment has been conducted at a low temperat ure (150 ℃) and pressurized condition in order to study t he geochromatographic effect of t he aromatic compounds in the course of the hydrocarbon expulsion from t he black mudstone strata and t he calcilutyte strata. The samples used in the experiment are source rock samples wit h or without oil mixed , which were collected respectively

from t he mudstone strata at 3 160 m in t he lower part of t he 3rd Member of Shahejie Formation , Well Tuo - 73 and t he calcilutyte strata at 2 432 m in t he upper part of t he 4t h Member of Shahejie Formation , Well Liangxie - 61 in the Dongying Sag , t he Bohai Bay Basin. The organic carbon content of the two samples are 3.08 % and 4. 0 % , and t he vit rinite reflectance ( Ro ) are 0. 42 % and 0.45 % respectively. The result s show t hat the geochromatographic effect is directly related to the molecular weight , since the high-weight molecular hydrocarbon is more difficult to migrate and t he geochromatographic effect is thus more insignificant . The hydrocarbon expulion causes t he ion flow content of the light2weight hydrocarbon series , such as naphthalene , increase and t he ion flow content of t he high2weight hydrocarbon series, such as triaromtic sterane , decrease in t he whole. While within the hydrocarbon series , the rearranged 1 ,3 ,6 - TMN ( trimethyl naphthalene) can migrate more easily t han the 1 ,2 ,5 - TMN , whereas the dethylphenanthrene migrates more difficultly than the mot her phenenthrene; t he relative content s of the compounds in dibenzofurans , dibenzot hiophenes , and biphenyl series change greatly compared with the other series , and t he related ratios of the compounds within t he above hydrocarbon series are regarded as potential indicator s of hydrocarbon migration.

Key words : biomarker ; aromatic hydrocarbon ; geochromatograp hic effect ; hydrocarbon expulsion ; primary migration ; simulation experiment

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