东海盆地西湖凹陷轻质原油芳烃地球化学特征

发布时间：2018-06-07 01:49

本文选题：西湖凹陷 + 轻质原油　；参考：《沉积学报》2017年01期

【摘要】：采用GC-MS实验技术,对西湖凹陷8口井12个轻质原油样品的芳烃地球化学特征进行了系统研究。平湖斜坡带北部地区NB14-1井、NB14-2井和NB14-3井这3口井的轻质原油与平湖斜坡带中部地区的NB25-1井和NB25-2井、西次凹的HY1-1井以及黄岩构造带的HY2-1井和HY2-2井这5口井的轻质原油芳烃化合物的分布特征和相对含量存在明显差别。轻质原油芳烃馏分中以二环和三环的化合物为主,前者富含菲系列化合物,萘系列和联苯系列化合物含量相对较低,后者则相反,其富含萘系列和联苯系列化合物,菲系列化合物含量相对较低。轻质原油生源和沉积环境的研究表明,原油的母源都主要为陆源高等植物来源,成因环境都为氧化环境,但后者的1,2,5-TMN和1,2,5,6-TeMN相对含量更高,氧芴相对含量和Pr/Ph值更大,反映其母源的陆源高等植物输入程度更大,沉积环境的氧化性更强。烷基萘、烷基菲和烷基二苯并噻吩成熟度指标表明,轻质原油以达到成熟到高熟演化阶段,平湖斜坡带北部地区的NB14-1井、NB14-2井和NB14-3井这3口井的轻质原油热演化程度相对更高。
[Abstract]:The geochemical characteristics of aromatics in 12 light crude oil samples from 8 wells in Xihu sag were systematically studied by GC-MS technique. Light crude oil from the three wells of NB14-1 well NB14-2 and NB14-3 well in the northern area of Pinghu slope belt and NB25-1 well and NB25-2 well in the central area of Pinghu slope belt, The distribution characteristics and relative contents of light oil aromatics in the five wells of HY1-1 well in Xisub depression, HY2-1 well in Huang Yan structural belt and HY2-2 well are obviously different. The aromatic fractions of light crude oil are mainly composed of bicyclic and tricyclic compounds, the former is rich in phenanthrene series, naphthalene and biphenyl series are relatively low, while the latter are rich in naphthalene and biphenyls. The content of phenanthrene compounds is relatively low. The study on the biogenic and sedimentary environment of light crude oil shows that the main source of crude oil is terrestrial higher plant source, and the genetic environment is oxidation environment, but the relative contents of 1zao 2o 5-TMN and 1zao 5N 6-TeMN are higher, and the relative content of fluorene and Pr/Ph value are higher in the latter. The higher terrestrial plants which reflect their mother source have higher input degree and stronger oxidation in sedimentary environment. The maturity index of alkyl naphthalene, alkyl phenanthrene and alkyl dibenzothiophene indicates that light crude oil reaches the stage of mature to high maturity evolution, and the thermal evolution of light crude oil in NB14-1 well NB14-2 and NB14-3 well in the northern area of Pinghu slope belt is relatively higher.
【作者单位】：中国地质大学(北京)能源学院;中国地质大学(北京)能源学院海相储层演化与油气富集机理教育部重点实验室;中国海洋石油(中国)有限公司上海分公司;
【基金】：国家科技重大专项(2011ZX05023-001-010) 国家自然科学基金(41472108)~~
【分类号】：P618.13

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