摘要
赛汉塔拉凹陷是二连盆地富油气凹陷之一,为揭示其原油特征及成因,对典型探井原油进行了原油物性和地球化学分析。原油物性数据显示,赛汉塔拉凹陷原油含硫量低、黏度低,API为28°~39°,总体为低成熟—成熟原油;不同层位原油的生物标志化合物参数差异较小,说明其沉积环境相似,为同一烃源岩不同成熟阶段排出的原油。选取原油伽马蜡烷/C_(30)霍烷,C_(30)~*/C_(29)Ts,Pr/Ph,重排甾烷/规则甾烷及甾烷异构化等参数进行聚类分析,赛汉塔拉凹陷原油可划分为2个油族:油族1为烃源岩在成熟阶段排出的原油,以阿尔善组和腾一段原油为代表;油族2为烃源岩在成熟阶段早期排出的原油,以腾二段原油为代表。勘探层系应集中在阿尔善组和腾一段储层中。
The Saihantala Sag is the one of hydrocarbon rich sags in Erlian Basin. The physical properties and geochemisty data of oil samples were analyzed to identify the feature and generation of oil in Saihantala Sag. The physical property data ofoil show that the crude oil samples are in low-moderate maturity stage with low viscosity, low sulfur content and API in a range of 280-39~. New geochemical data have been gathered from crude oil sam- pies, and denote that the crude oil derived from source rocks with similar depositional environment and expelled hydrocarbon in different mature stages. Several variables including ratios of gammacerane/C30hopane, C30＊/ C29 Ts, Pr/Ph, diasteranes/regular steranes, and sterane isomerization parameters, were selected to carry out cluster analysis, and the crude oil in Sanhantala Sag can be divided into two oil families. Oil-family I mainly distributes in Lower Cretaceous K1 ba, K1 btl and expelled from source rocks in the late phase of oil window; Oil-family Ⅱ is mainly from K1 bt2 and derived from source rocks in the early phase of oil window. The data of crude oil suggest that the exploration zone should be aimed at the reservoirs of the K1 ba and K1 bt1.
出处
《岩性油气藏》
CSCD
北大核心
2017年第2期36-43,共8页
Lithologic Reservoirs
基金
中国石油天然气股份有限公司重大科技专项"华北油田上产稳产800万吨关键技术研究与应用"(编号:2014E-35-07)资助
