A
西北大学学报(自然科学版)
孟晶
2011
年
12
月,第
41
卷第
6
期,
Dec.
,
2011
,
Vo
l.
41
,
No.
6
r/
Journal
of
Northwest
University
(Natural
Science
Editio
叫
,
JNWU
鄂尔多斯盆地延长组超低渗透岩性油藏
成藏流体动力系统特征及其意义
邓秀芹
ljk
泾利胡喜锋
2
李士祥刘
鑫
l
(1.长庆油田公司勘探开发研究院/低渗透油气回勘探开发国家工程实验室,陕西西安
710018
;
2.
长庆油田公司勘探部,陕西西安
710018)
摘要:目的
研究鄂尔多斯盆地延长组长
6
一长
8
发育大型特低渗、超低渗岩性油藏的成藏流体动
力特征,揭示低渗透油藏的成藏规律。方法
通过测井声波时差曲线,分析最大埋深阶段的泥岩欠
压实作用及过剩压力分布特征,结合岩性和物性特征划分成藏动力系统。结果
延长组长
6
一长
8
油层组为超压成藏流体动力系统,通过成藏流体动力分布特征分析,可以进一步划分为西南成藏流
体子系统和东北成藏流体子系统。西南子系统由于构造上倾方向储层变得更加致密,油气以纵向
运移为主,东北子系统内油气既可以纵向远移,又可以沿着层状输导体横向远移。结论
西南子系
统内,过剩压力差低值区或高压差区内相对低值区为油气成藏的有利地区;东北子系统内,平面上
过剩压力低值区为油气运聚的有利地区。
关
键词:过剩压力;超低渗岩性油藏;成藏流体动力系统;油气运移;鄂尔多斯盆地
中图分类号
:TE122.1
文献标识码
:A
文章编号
:1000-274X
(2011
)06-1044
-0
7
Characteristics
and
geological significance
of
hydrodynamic system on
u1
tra-low permeability reservoir
of
Yanchang formation in Ordos Basin
DENG
Xiu-qin
1
,
YAO
Jing-li
1
,
HU
Xi-feng
2
,
LI
Shi-xiang
1
,
LIU
Xin
1
(1.
Exploration
and
Development
Research
Institutio
n/
National
Engineering
Lab
oratory
for
Exploration
and
Development
of
Lo
w-Permeability
Oil
&
Gas
Fields
,
Changqing
Oilfield
Company
,
Xi'
an
710018
, China;
2.
Exploration
Department
,
Changqing
Oilfield
Company
,
Xi'
an
710018
,
China)
Abstract:
Aim The large-scale oil pools , with the feature of extra-low permeability and ultra-low permeability,
are deveolped in Yanchang formation in Ordos Basin. The research on the hydrodynamic system will
be
of
service
to
the future accumulation study and exploration.
Methods
First, through the study of acoustic travel time
of
logging,
the low compaction
of
mudstone at the stage of maximum burial depth is
acquired;
then , the
ove
甲
Iressure
is calcu-
lated. Last
, according to lithology , physical property and pressure distribution , the hydrodynamic system is ana-
lyzed.
Resultsηle
Ch6-Ch8 reservoir group is a superpressure hydrodynamic system under the action
of
unstable
compaction of mudstone at the major pool forming period. It
can
be divided into such
two
types as southwest and
northeast hydrodynamic subsystems. As to the southwest hydrodynamic subsystem
, the higher the altitude , the more
seriously compacted the reservoir is. Vertical migeration of hydrocarbon played a dominant role in the process of oil
pool forming. As to the northeast hydrodynamic subsystem, oil migerated not only vertically
but
also transversely
through the layered carrier bed.
Conclusion
币
le
areas with low overpressure-difference or the areas with relative
low overpressure-difference in high overpressure-difference region are the preferential places for oil migeration in the
southwest subsystem.
Th
e areas
wi
由
low
overpressure are the faverable places for oil accumulation in the northeast
收稿日期
:2010
-09 -27
基金项目:国家科技重大专项基金资助项目(
2011ZX05
创
4;2011ZX05
∞
1
)
作者简介:邓秀芹,女,四川阁中人,西北大学博士生,从事沉积相、石油地质综合研究。