兰坪坳陷上三叠统原油地球化学及有机成矿意义  

GEOCHEMISTRY OF LATE TRIASSIC OILS IN THE LANPING DEPRESSION AND ITS IMPLICATIONS TO ORGANIC MINERALIZATION

作　　者：郭海花[1] 常象春[1] 张金亮[2] 

机构地区：[1]山东科技大学地球信息科学与工程学院,山东泰安271019 [2]中国海洋大学地球科学学院,山东青岛266003

出　　处：《长安大学学报（地球科学版）》2003年第4期1-5,共5页

基　　金：国家攀登计划地质流体项目(95-预-39-3)

摘　　要：　兰坪坳陷金顶矿区下含矿层产有多层稠油,储层主要为上三叠统三合洞组的灰岩和角砾状灰岩。原油地球化学特征表明有机母质是多源性的,并以低等水生藻类贡献为主,沉积水体介质以还原性占优势,具有较高盐度,有机质热演化处于成熟-高成熟阶段,生物降解改造较为强烈。铅锌金属与稠油的共生、金属硫化物的有机生物硫特征、有机质富集地区矿化强烈等均表明有机质参与了金属成矿。按照不同世代有机质与金属成矿作用机理,本区有机成矿主要以配合作用及吸附、还原作用为主。Heavy oil were recently discovered in brecciated limestone, micrite kimestone and dolomitized limestone associated with Jinding lead-zinc deposits. The geochemical characteristics indicate that sources were multiple and mainly came from lower aquatic algae. The sedimentary water medium was reducing with high salinity. Thermal evolution is in the stage of mature to high mature characterized by highly biodegradation. The symbiosis of heavy crude oils and lead-zinc ores, organic sulfur characteristic of metallic sulfides and strong mineralization in organic-rich zones suggest that oils participated into metal mineralizationdirectly. According to the mutual influencing mechanism between organic mattersgenerated in different stage and metal mineralization, organic mineralization in Lanping was characterized by matching, absorption and reducing.

关 键 词：地球化学 生物标志物 有机成矿 配合作用 吸附还原作用 原油 

分 类 号：P618.13[天文地球—矿床学] P59[天文地球—地质学]