塔河油田9区下油组块状叠置厚油层渗流屏障研究

刘学利; 郑小杰; 屈兴勃; 张小军; 蔡玥

doi:10.12401/j.nwg.2022049

塔河油田9区下油组块状叠置厚油层渗流屏障研究

1.
中国石化西北油田分公司，新疆乌鲁木齐　830011

2.
长庆油田第七采油厂，甘肃庆阳　745000

3.
长庆油田第一采油厂，陕西延安　710064

4.
西安科技大学地质与环境学院，陕西西安　710054

基金项目: 中国石化科技攻关项目“塔河油田底水砂岩油藏提高采收率技术研究”（P19026-1），国家重点基础研究发展计划（“973”计划）项目（2012CB214804）和西安科技大学博士研究启动项目（2020QDJ012）联合资助。

详细信息

作者简介: 刘学利（1974−），男，博士，正高级工程师，主要从事油气藏开发理论研究。E–mail：lucas2000_swpi@126.com

通讯作者: 蔡玥（1987−），女，博士，讲师，现主要从事油气田开发地质方面的研究。E–mail：caiyue110687@126.com

中图分类号: P618.13；TE122.1

收稿日期: 2020-02-21

修回日期: 2022-11-05

录用日期: 2023-01-10

刊出日期: 2023-04-20

Research on Seepage Barriers of Massive and Superimposed Thick Oil Layers in the Low Oil Formation of No. 9 Block in Tahe Oilfield

1.
Sinopec Northwest Oilfield Company, Urumqi 830011, Xinjiang, China

2.
Seventh Oil Production Plant, Changqing Oilfield, Qingyang 745000, Gansu, China

3.
First Oil Production Plant, Changqing Oilfield, Yanan 710064, Shaanxi, China

4.
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China

More Information

Corresponding author: CAI Yue, caiyue110687@126.com

Received Date: 21 February 2020

Revised Date: 05 November 2022

Accepted Date: 10 January 2023

Publish Date: 20 April 2023

摘要

摘要:
塔河油田9区三叠系阿克库勒组下油组储层为典型的块状叠置辫状河三角洲储层，夹层分布及连通性极其复杂，封闭断层和泥质屏障、钙质胶结帯等不同级次渗流屏障控制着油藏内部油水运动。为深化储层空间非均质表征，在储层构型分析基础上，笔者采用层次分析方法，动静态相结合，对渗流屏障类型及其级次进行划分，分析泥质屏障、钙质胶结帯形成机理及其受控因素，建立块状厚油层渗流屏障分布地质模型。研究表明：塔河油田9区下油组主要渗流屏障为封闭断层屏障和层间、层内发育的泥质及钙质隔夹层；依据渗流阻挡作用分为4个级次，东北向封闭性断层及复合河道顶部6级界面是1级渗流屏障，3～5级构型界面控制了2～4级泥质、钙质渗流屏障的发育，建立完全不遮挡型、部分遮挡型及完全遮挡型等3种渗流屏障模式。通过分级次定量表征渗流屏障的空间分布，深化储层空间非均质性研究，为基于流动单元的精细地质建模奠定基础。
- 储层构型 /
- 渗流屏障 /
- 辫状河三角洲 /
- 库勒组下油组 /
- 塔河油田
Abstract:
The low oil formation reservoir of No. 9 block in the Tahe Oilfield is a superimposedmassive braided river delta reservoir, moreover, distribution and connectivity of the interlayers as well as complexity produced the sealing faults, argillaceous barriers, calcareous cemented zones and other different–level seepage barriers to control the movement of oil and water within the reservoir is to deepen the heterogeneity of the reservoir space; and the analytic hierarchy process is adopted based on the analysis of the reservoir configuration, and combined with dynamic and static, to clarify the seepage barrier types and levels;the formation mechanism of calcareous cement zone and its controlling factors is analyzed by researcher, so that establishes a geological model for the distribution of seepage barriers in massive thick oil layers; Researches show that the main seepage barriers of the low oil formation in No. 9 Block of Tahe Oilfield are sealing faults barriers, mud barriers, and calcium cemented zones, what is more, it can be divided into four levels according to the seepage blocking effect, and northeast sealing faults and the 6–level interface at the top of the composite channel are the first–level seepage barrier, the 3～5 level configuration interface controls the 2～4 level mud and calcareous seepage barriers; to establish three types of seepage barrier modes composed by completely uncover, partial cover, and completely cover. The spatial distribution of seepage barriers is characterized by hierarchical and sub–quantitative methods, which deepening the study of reservoir spatial heterogeneity, and laying the foundation for fine geological modeling based on flow units.
- reservoir architecture /
- seepage barrier /
- braided river delta /
- low oil formation of Kuhle Group /
- Tahe oilfield

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图 1 研究区构造位置图

Figure 1.

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图 2 塔河油田9区下油组沉积柱状剖面图

Figure 2.

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图 3 塔河油田9区S100井下油组构型单元及界面单井柱状图

Figure 3.

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图 4 塔河油田9区三叠系下油组三角洲前缘储层构型模式图（据徐丽强等，2016修改）

Figure 4.

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图 5 塔河9区封闭性断层分布

Figure 5.

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图 6 塔河油田9区三叠系下油组各类型夹层岩电特征

Figure 6.

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图 7 塔河油田9区三叠系下油组1-1单层二级渗流屏障平面分布图

Figure 7.

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图 8 塔河油田9区三叠系下油组三级渗流屏障遮挡剖面图

Figure 8.

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图 9 塔河油田9区三叠系下油组1-1单层四级渗流屏障平面分布图

Figure 9.

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图 10 基于构型控制的块状厚油层渗流屏障分布地质模型

Figure 10.

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图 11 塔河油田9区三叠系下油组1-1单层渗流屏障分布图

Figure 11.

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表 1 渗流屏障级次及特征

Table 1. Seepage barrier grades and characteristics

渗流屏障级别	定义	对应构型界面级别	通体级别
一级	封闭性断层及垂向不同期次沉积体系间的非渗透性边界	6级（区域稳定沉积的泥岩隔层、不整合）	连通体
二级	同期水道与心滩坝沉积组合之间非渗透性边界	5级（沉积体系组合之间的泥岩或者泛滥平原沉积）	连通单元
三级	同期水道与心滩项之间的界面	4级（泥质河道、泥质半充填河道和洪水漫流细粒沉积）	连通单元
四级	心滩坝内部的非渗透性沉积	3级（心滩坝内部落淤层，坝上沟道	渗流单元

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表 2 不同构型单元非均质性参数统计表

Table 2. Statistical table of heterogeneity parameters of different configuration units

层号	辫状河道				心滩				水下/水上分流河道				水下/水上河道侧缘
层号	平均值	变异系数	突进系数	级差	平均值	变异系数	突进系数	级差	平均值	变异系数	突进系数	级差	平均值	变异系数	突进系数	级差
T2a1-1	—	—	—	—	—	—	—	—	103	0.6	4	49.3	93.7	0.7	6.7	563.5
T2a1-2	68.3	0.42	1.7	3.6	—	—	—	—	120.3	0.52	4	69.4	140.9	0.62	3	14.9
T2a1-3	221.9	0.55	2.5	11.5	136.1	0.4	1.9	7.4	150.6	0.5	3	34.3	106.5	0.52	2.9	10.7
T2a1-4	207.6	0.58	3.6	32	160.4	0.56	3.5	51.3	—	—	—	—	—	—	—	—
平均	165.9	0.52	2.6	15.7	148.3	0.48	2.7	29.3	125.4	0.54	3.7	51	113.7	0.61	4.2	196.4

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