石油实验地质2018，Vol.40Issue(3)：381-388,8.DOI:10.11781/sysydz201803381
复合油藏形成中的蒸发分馏与生物降解联合控制作用——以渤海海域秦皇岛29-2油田为例
Evaporative fractionation and biodegradation impacts on a complex petroleum system:QHD29-2 oil field,Bohai Sea area
摘要
Abstract
By studying the tectonic background of QHD29-2 oil field and the geochemical characteristics of oil and gas and its source rocks,the dissimilarity of crude oil physical properties was discussed from the perspective of evaporative fractionation and biodegradation. Oil source comparison confirmed that the oils in Paleogene and Neogene had the same source. However, there were significant differences in light hydrocarbon composition, family composition and the chromatographic distribution of saturated hydrocarbons,indicating that they had expe-rienced a strong evaporative fractionation. Combined with the analyses of source rock thermal evolution,accumu-lation stage and fault activity history, it was believed that the intrusion of mantle-derived CO2gas had caused evaporative fractionation in the area. The evaporative fractionation and biodegradation jointly controlled crude oil physical properties in the reservoir. Evaporative fractionation and biodegradation were the main factors controlling the differences of crude oil physical properties in reservoirs,and the differences were mainly controlled by evapo-rative fractionation,whereas,the oil in shallow reservoirs was controlled by both evaporation and biodegradation. Extra-heavy,light,condensate and heavy oils distributed in sequence from deep to shallow reservoirs. The two mechanisms had an impact on the same reservoir simultaneously. The early reservoirs in deep formations were affected by evaporative fractionation. After the shallow reservoirs of the post-accumulation were biodegraded,they were continuously charged in the late stage of the pre-existing reservoir.关键词
蒸发分馏/生物降解/秦皇岛29-2油田/复合油藏/秦南凹陷/渤海海域Key words
evaporative fractionation/biodegradation/QHD29-2 oil field/multi-layer composite reservoir/Qinnan Sag/Bohai Sea分类
能源科技引用本文复制引用
牛成民,王飞龙,汤国民,燕歌,赵国祥..复合油藏形成中的蒸发分馏与生物降解联合控制作用——以渤海海域秦皇岛29-2油田为例[J].石油实验地质,2018,40(3):381-388,8.基金项目
国家科技重大专项(2016ZX05024-002-006)和国家自然科学基金项目(41602111)联合资助. （2016ZX05024-002-006）
