摘要
福山凹陷是北部湾盆地重要的含油气凹陷,目前已发现的油气田主要分布在环白莲洼陷和皇桐洼陷周缘地区。分析表明,福山凹陷原油具有高API、低密度、低黏度、低含硫量、中—低含蜡量和高饱和烃含量的特征,以轻质油和凝析油为主,为烃源岩在成熟阶段排出的烃类。该凹陷原油饱和烃色谱主要以单峰态前峰型为主,少量为双峰态后峰型,奇偶优势不明显,具有较强的姥鲛烷优势;C27、C28、C29规则甾烷丰度呈"V"字型分布,普遍具有较高的奥利烷含量和较低的伽马蜡烷含量,因此具有相似的来源,母质为藻类与高等植物双重贡献,沉积环境为偏淡水氧化的湖沼环境。根据原油的成熟度和空间分布,可将该凹陷原油划分为2个组群,其中油族Ⅰ主要以东部花场、白莲、花东、红光地区流三段原油为主,具有相对较高的成熟度和奥利烷指数;油族Ⅱ主要以东部花场、白莲、花东地区流一二段和西部博厚-朝阳、美台等地区流三段原油为主,具有相对较低的成熟度。
Fushan sag is an important petroliferous sag in Beibuwan basin,the oil and gas fields discovered are mainly distributed in the peripheral areas of Bailian and Huangtong sub-sags.The analysis shows that the crude oil in Fushan sag,with the characteristics of high API,low density,low viscosity,low sulfur content,medium-low wax content and high saturated hydrocarbon content,and dominated by light oil and condensate oil,are the hydrocarbon discharged from the source rock in the mature stage.Saturated hydrocarbon chromatograms of crude oil in this sag mainly show a leading peak unimodal distribution,and some have post peak bimodal distribution,with inapparent odd-even preference and a strong pristane predominance.Sterane C27,C28 and C29 are distributed in"V"shape.They generally have relatively high oleanane content and low gammacerane content.Therefore,these oil have the same origin,and derive from algae and higher plants,which deposited in fresh water lacustrine bog environment with oxidized condition.According the maturity and distributions,crude oil in the sag can be divided into two oil families.Oil family Ⅰ mainly composed of the crude oil from the third member of the Liushagang Formation in the Huachang,Bailian,Huadong and Hongguang areas in the eastern part of the sag,with relatively high maturity and oleanane index;Oil family Ⅱ mainly consists of the crude oil from the first and second members of Liushagang Formation in the Huachang,Bailian,Huadong and Hongguang areas in the eastern part of the sag,and the crude oil from the third member of Liushagang Formation in the Bohou-Chaoyang,Meitai areas in the western part of the sag,with relatively low maturity.
作者
时阳
郭浩
廖飞燕
程刚
李晓寒
SHI Yang;GUO Hao;LIAO Feiyan;CHENG Gang;LI Xiaohan(Exploration and Development Research Center of PetroChina South Petroleum Exploration and Development Co.,Ltd.,Haikou,Hainan 570216,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2020年第6期31-42,共12页
China Offshore Oil and Gas
关键词
北部湾盆地
福山凹陷
原油
物理性质
地球化学特征
沉积环境
组群划分
Beibuwan basin
Fushan sag
crude oil
physical property
geochemical characteristic
depositional environment
group division
作者简介
第一作者:时阳,男,硕士,工程师,2011年毕业于中国石油大学(北京),现主要从事石油地质综合研究及油气勘探方面的工作。地址:海南省海口市龙华区金濂路16号212室(邮编:570216)。E-mail:shiy02@cnpc.com.cn。
