溱潼凹陷红庄构造凝析油气地化特征研究  

GEOCHEMICAL BEHAVIORS OF CONDENSATES IN HONGZHUANG STRUCTURE IN QINTONG SAG

作　　者：张枝焕[1] 王瑶 吴聿元[3] 陆黄生[3] 张振英[4] 

机构地区：[1]中国石油大学教育部"石油天然气成藏机理"重点实验室 [2]重庆宏伟建筑设计咨询有限责任公司 [3]中国石化股份有限公司华东分公司 [4]北京市经济管理干部学院

出　　处：《天然气工业》2006年第9期8-11,共4页Natural Gas Industry

基　　金：国家自然科学基金"高蜡凝析油组成特征及成因机理"(编号:40172056)

摘　　要：通过凝析油与正常原油及烃源岩的饱和烃、芳烃生物标志物及稳定碳同位素组成特征的对比分析,推测红庄构造古近系CO2气层中的凝析油气不是来源于古近系烃源岩中的有机质高成熟阶段生成的产物,而是来源于深部上古生界烃源岩。深部CO2气体向上运移过程中,经过上古生界烃源岩或储层时,对烃源岩中的沥青或原先存在于储层中原油发生气洗(超临界萃取)作用,导致原油或储层沥青中低分子量烃类选择性地溶解在CO2中,并随CO2气体向上运移进入古近系储层。当溶解在CO2中的烃类化合物向上部运移过程中,由于温度、压力的降低而从CO2中析出,形成了凝析油气。Based on comparative analysis of condensate, normal crude oil and source rock in respects of saturated hydrocarbons, aromatic hydrocarbon biomarkers and component of stable carbon isotope, it is supposed that the condensates in Paleogene CO_2 reservoir in Hongzhuang structure were not generated by Paleogene source rocks in high maturity stage, but were sourced from the deep Upper Paleozoic source rocks. When the deep CO_2 migrated upward through the Upper Paleozoic source rocks or reservoirs, the light hydrocarbons of the bitumen in the source rocks or that of the crude oil in the reservoirs were selectively dissolved in CO_2 by gas washing, i.e. supercritical extraction, and migrated upward along with CO_2 into the Paleogene reservoirs. Condensates were formed when light hydrocarbons dissolved in CO_2 dropped out due to decreasing of the temperature and pressure in the process of upward migration.

关 键 词：苏北盆地 溱潼凹陷 红庄构造 凝析油气 地球化学 成因机理 

分 类 号：P618.13[天文地球—矿床学]