|本期目录/Table of Contents|

[1]朱俊章 施 洋 熊万林 史玉玲 杨兴业 黄玉平.开平凹陷古近系稠油和砂岩储层沥青质成因分析[J].中国海上油气,2020,32(02):34-43.[doi:10.11935/j.issn.1673-1506.2020.02.005]
 ZHU Junzhang SHI Yang XIONG Wanlin SHI Yuling YANG Xingye HUANG Yuping.Genesis analysis of Paleogene heavy oil and asphaltene in sandstone reservoir in Kaiping sag[J].China Offshore Oil and Gas,2020,32(02):34-43.[doi:10.11935/j.issn.1673-1506.2020.02.005]
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开平凹陷古近系稠油和砂岩储层沥青质成因分析()

《中国海上油气》[ISSN:1673-1506/CN:11-5339/TE]

卷:
第32卷
期数:
2020年02期
页码:
34-43
栏目:
油气勘探
出版日期:
2020-03-25

文章信息/Info

Title:
Genesis analysis of Paleogene heavy oil and asphaltene in sandstone reservoir in Kaiping sag
文章编号:
1673-1506(2020)02-0044-10
作者:
朱俊章 施 洋 熊万林 史玉玲 杨兴业 黄玉平
(中海石油(中国)有限公司深圳分公司 广东深圳 518054)
Author(s):
ZHU Junzhang SHI Yang XIONG Wanlin SHI Yuling YANG Xingye HUANG Yuping
(CNOOC China Limited, Shenzhen Branch, Shenzhen, Guangdong 518054, China)
关键词:
珠江口盆地 开平凹陷 古近系 砂岩储层 稠油 沥青质 形成机制
Keywords:
Pearl River Mouth Basin Kaiping sag Paleogene sandstone reservoir heavy oil asphalt formation mechanism
分类号:
TE122
DOI:
10.11935/j.issn.1673-1506.2020.02.005
文献标志码:
A
摘要:
通常情况下埋深大于2 000 m的油藏中原油受次生改造作用影响较小,但珠江口盆地首次在开平凹陷埋深大于2 000 m的古近系发现了稠油油藏和大量沥青质砂岩层。为揭示该凹陷区稠油和砂岩储层沥青质的形成机制,开展了原油和岩石样品系统取样和地球化学测试分析,结合凹陷埋藏-热演化史、油藏地质特征等分析,对典型稠油油藏和沥青质砂岩层进行了深入解剖。研究表明,10 Ma左右开平主洼文昌组淡水中深湖相烃源岩生成的油气自深部向浅部依次充注到恩平组、珠海组圈闭中聚集成藏,成藏后遭受生物降解、水洗和汽油馏分烃散失等次生改造作用,使得原生成因的中质油藏原油变重变稠,从而形成了现今次生成因的稠油油藏和大量沥青质砂岩层。开平凹陷不具备生成原生成因稠油的石油地质条件,开平主洼文昌组淡水中深湖相烃源岩主要生成原生中质油和轻质油,因此洼陷内深部构造-地层圈闭具有中质原油和轻质原油的勘探潜力。
Abstract:
Usually crude oil is less prone to secondary reconstruction in oil reservoir at buried depth below 2 000 m. However, heavy crude oil accumulations and numerous asphalt sandstone layers were discovered for the first time at a buried depth below 2 000 m in paleogene in Kaiping sag in Pearl River Mouth Basin. In order to uncover the formation mechanism of heavy oil and asphaltene in sandstone reservoir in this sag, systemically collection and geochemical test and analysis of oil samples and rock samples were carried out. In combination of the analysis on buried-thermal evolution history and reservoir geologic characteristic, typical heavy oil reservoir and asphalt sandstone layers were studied in depth. Studies show that hydrocarbon generated from source rocks of middle and deep lacustrine facies in fresh water of the Wenchang formation in Kaiping sag at about 10 Ma flowed into Enping and Zhuhai formations from down to up to form accumulation. The original medium oils in the accumulations were secondarily altered by biodegradation, water-washing and gasoline fraction dissipation, forming current heavy oil reservoirs and numerous asphalt sandstone layers of secondary origin. The Kaiping sag does not have the geological conditions required for forming primary heavy oil, while source rocks of middle and deep lacustrine facies in fresh water of the Wenchang formation in Kaiping sag mainly generate primary light-medium oil. Therefore, deep structures and stratigraphic traps in Kaiping sag have the exploration potential of light-medium oil.

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备注/Memo

备注/Memo:
*“十三五”国家科技重大专项“南海东部海域勘探新领域及关键技术(编号:2016ZX05024-004)”部分研究成果。 第一作者简介: 朱俊章,男,教授级高级工程师,从事石油地质、油气地球化学及成藏研究工作。地址:广东省深圳市南山区后海滨路(深圳湾段)3168号中海油大厦A座(邮编:518054)。E-mail:zhujzh@cnooc.com.cn。收稿日期:2019-09-19 改回日期:2019-12-20 (编辑:崔护社 冯 娜)
更新日期/Last Update: 2020-03-30