东营凹陷南斜坡沙四段混源油地球化学与成藏特征  

Geochemistry and Accumulation Characteristics of Es_4 Mixed Oils in the South Slope of Dongying Sag

作　　者：常象春[1,2] 韩作振 鄢程鹏[2] 

机构地区：[1]山东省沉积成矿作用与沉积矿产重点实验室,山东青岛266510 [2]山东科技大学地质科学与工程学院,山东青岛266510

出　　处：《吉林大学学报（地球科学版）》2012年第3期672-680,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40502013);山东省高校科研计划项目(J09LE08);山东科技大学科研创新团队计划项目(2010KYTD103)

摘　　要：东营凹陷南斜坡是具有较大勘探潜力的地区。研究表明:沙四段原油具有典型的混源油特征,母源输入存在低等水生生物和高等植物的双重贡献,原油成熟演化存在低成熟—成熟的变化,沉积成烃环境主体以还原性为主但还原程度不同,个别样品表现出生物降解前后两期原油混合充注的特点。南斜坡东部原油来自牛庄洼陷,乐安、王家岗油田以沙四型原油为主,混有少量沙三型原油;南斜坡中部原油来自牛庄和利津洼陷,梁家楼油田以沙三型原油为主,混有少量沙四型原油,纯化油田则与之相反;南斜坡西部原油来自博兴洼陷,正理庄、高青油田以沙四型原油为主,混有少量沙三型原油,金家油田则以沙三型为主。洼陷中心沙四—沙三段生成的成熟油气和斜坡带沙四段生成的低熟油气通过断层和不整合面向斜坡高部位运移,以混源油的形式聚集成藏。The south slope of Dongying sag is a favorable petroleum exploration target. The research results indicate that Es4 oils show typical characteristics of mixed oils. The source inputs contain dual contributions of aquatic lives and high plants, thermal maturities are varied from low mature to mature, sedimentary environments are mainly reduction with different intensities, and part samples show characteristics of mixed oil charging before and after biodegraded. According to the geochemical correlation, for the east part of south slope with Niuzhuang sag as source kitchen, Le＇an and Wangjiagang oil fields are Es4-sourced oils mixed with few Esa-sourced. For the middle part with Niuzhuang and Lijin sag as source kitchens, Liangjialou oilfield is Esa-sourced oils mixed with few Es4- sourced, while Chunhua oilfield is reversed. For the west part with Boxing sag as source kitchen, Zhenglizhuang and Gaoqing oilfields are Es4-sourced oils mixed with few Esa-sourced, while Jinjia oilfield is Esa-sourced. Mature oils generated from Es4 - Es3 in the subsag center are mixed by the low mature oils generated from Es4 in the slope, migrated along faults and unconformities, and accumulated on thehigh parts of the south slope.

关 键 词：混源油 油源对比 贡献率 地球化学 生物标志物 东营凹陷南斜坡 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]