摘要
陆相生油的基本依据仍是世界上通用的干酪根热降解学说。但是,济阳坳陷油气勘探中发现这个学说需要补充和发展,本文提出了两期油气生成的地球化学模式。早期油气生成的母源物质是湖盆中某些生物含有的低化学活性烃类聚合物。富含烃的葡萄藻类,活体经培植有40%以上的可溶烃,热模后(相当 R_o<0.30%)生成饱和烃系列。晚期分为干酪根热解聚和热降解两个阶段。热解聚生成低熟油气,热降解生成成熟及高熟油气。有利生油气的干酪根母质受生物富集层控制,形成主力生油层。其生油门限因块断湖盆地温场差异性大,又为小洼陷沉积单元所控制。
The basic data about continental oil generation is still the theory on thermal degrada-tion of kerogen commonly used in the world.But during the exploration of hydrocarbonin Jiyang Depression,it was found that the theory should be added and improved.A geo-chemical model of oil-gas generation in two stages—the early and .late stages—has beenproposed in this paper.The parent materials to generate oil and gas in the early stage washydrocarbon polymer parts with low chemical activity contained in some organisms livedin lacustrine basins such as hydrocarbon-rich Botryococcus braunii which containned morethan 40% soluble hydrocarbon when cultured living body and generated saturatehydrocarbon series after thermal simulation (R(?)<0.30%).Two stages of thermal depolymerization and thermal degradation were divided in the late stage.low-matured oiland gas were generated in thermal depolymerization,matured and high-matured oil andgas were generated in thermal degradation.The parent materials of kerogen,favourablefor hydrocarbon generation were controlled by biology-rich zones,which would generatethe major source beds.As there are much differences in geothermal fields,the sourcethreshold would be controlled by sedimentary units in minor sags.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1992年第4期359-370,共12页
Oil & Gas Geology
