砂泥岩地层地应力纵向分布特征与规律

张东涛; 童亨茂; 赵海涛; 吕雪; 张昊

砂泥岩地层地应力纵向分布特征与规律

张东涛^{1, 2},
童亨茂^2, ,,
赵海涛³,
吕雪¹,
张昊¹

1.
中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249
2.
中国石油天然气股份有限公司浙江油田分公司, 杭州 310023
3.
天津城建大学地质与测绘学院, 天津 300384

基金项目:

国家自然科学基金项目 41272160

国家自然科学基金项目 40772086

国家油气重大专项 2011ZX05006-006-02-01

国家油气重大专项 2011ZX05023-004-012

详细信息

作者简介:
张东涛, 男, 硕士生, 中石油浙江油田分公司助理工程师

通讯作者:
童亨茂, E-mail:tonghm@cup.edu.cn, tong-hm@163.com

中图分类号: P553
计量
- 文章访问数: 252
- HTML全文浏览量: 91
- PDF下载量: 42
- 被引次数: 0
出版历程
- 收稿日期: 2014-07-04
- 刊出日期: 2014-12-01

CHARACTERISTICS AND REGULARITY OF LONGITUDINAL GEOSTRESS DISTRIBUTION IN SAND-MUDSTONE STRATA

1.
State Key laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
2.
Zhejiang Branch of China National Petroleum Corporation, Hangzhou 310023, China
3.
School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, China

摘要

摘要: 以实际沉积地层中抽象出来的砂泥岩地层概念模型为研究对象, 在盆地构造力学、岩石力学性质分析的基础上, 采用应力场数值模拟法研究分析砂泥岩地层中的纵向地应力分布特征和规律。研究结果表明, 水平主应力在砂泥岩的分界面发生突变, 变化程度主要与两侧岩石的力学性质差异相关, 也与区域构造应力有一定关联; 杨氏模量对最大水平主应力影响程度大于对最小水平主应力的影响, 泊松比对地层最小水平主应力影响程度大于对最大水平主应力的影响。杨氏模量和泊松比对最大水平主应力的影响, 在伸展应力状态下前者影响相对较小, 走滑应力状态下, 影响程度基本相同, 挤压应力状态下, 前者影响程度相对较大; 而对于最小水平主应力的影响, 在三种应力状态下, 泊松比的影响均大于杨氏模量。地层的岩性变化方式(渐变或突变)对地层最小水平应力差产生显著影响, 厚度变化对地层最小水平应力差大小无影响。上述认识可以指导砂泥岩地层的压裂和储层改造, 改善压裂效果。
- 地应力分布 /
- 数值模拟 /
- 泊松比 /
- 杨氏模量 /
- 砂泥岩
Abstract: Based on the analysis of basin geomechanics and mechanical properties of rocks, the characteristics and regularity of geostress distribution in the sand-mudstone strata are studied with numerical modeling by using the conceptual model of sand-mudstone strata abstracted from actual sedimentary strata. The results showed that horizontal principal stress mutates at the interface of sand-mudstone strata, and the change degree is mainly related to the difference of mechanical property of rock on both sides, then the regional tectonic stress. The effect of Young Modulus on the horizontal maximum principal stress is greater than that on the horizontal minimum principal stress; while the effect of Poisson Ratio on the horizontal minimum principal stress is higher than that on the horizontal maximum principal stress. The effect of Young Modulus and Possion Ratio on the horizontal maximum principal stress is different in different stress state. In extensional strike-slip and compressional stress state, Possion Ratio has greater roughly equivalent and samller effect on the horizontal maximum principal stress respectively. While, the effect of Possion Ratio on the horizontal minimum principal stress is always greater than that of Young Modulus in different stress state. The way of lithology changes in strata (mutations or gradient) has remarkable influence on the stress difference of horizontal principal stress, while the thicknesses no effect. The above understanding is valuable for effective reservoir hydraulic fracturing and reformation.
- geostress distribution /
- numerical simulation /
- Poisson Ratio /
- Young Modulus /
- sand-mudstone

HTML全文

图 1 模型Ⅰ网格剖分加载

Figure 1. Numerical modelⅠwith boundary conditions

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图 2 模型Ⅱ网格剖分加载

Figure 2. Numerical modelⅡwith boundary conditions

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图 3 伸展应力状态下杨氏模量与水平主应力关系

Figure 3. Relationship between Young modulus and horizontal principal stress under extensional stress state

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图 4 伸展应力状态下泊松比与水平主应力关系

Figure 4. Relationship between Poisson ratio and horizontal principal stress under extensional stress state

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图 5 在伸展应力状态下，模型Ⅰa水平主应力等值线分布

Figure 5. Contour of horizontal principal stress for model Ⅰa under extensional stress state

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图 6 走滑应力状态下杨氏模量与水平主应力关系

Figure 6. Relationship between Young modulus and horizontal principal stress under strike-slip stress state

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图 7 走滑应力状态下泊松比与水平主应力关系

Figure 7. Relationship between Poisson ratio and horizontal principal stress under strike-slip stress state

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图 8 挤压应力状态下杨氏模量与水平主应力关系

Figure 8. Relationship between Young modulus and horizontal principal stress under compressive stress state

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图 9 挤压应力状态下泊松比与水平主应力的关系

Figure 9. Relationship between Poisson ratio and horizontal principal stress under compressive stress state

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图 10 模型Ⅱ最小水平主应力等值线分布

Figure 10. Contour of minimum horizontal principal stress for model Ⅱ

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表 1 模型Ⅰa、Ⅰb岩石力学参数分布

Table 1. Parameters of rock mechanics for modelⅠa andⅠb

Ⅰa层位	杨氏模量/ GPa	泊松比	Ⅰa层位	杨氏模量/ GPa	泊松比	Ⅰb层位	杨氏模量/ GPa	泊松比	Ⅰb层位	杨氏模量/ GPa	泊松比
1	15	0.3	7	33	0.3	1	30	0.15	7	30	0.33
2	18	0.3	8	36	0.3	2	30	0.18	8	30	0.36
3	21	0.3	9	39	0.3	3	30	0.21	9	30	0.39
4	24	0.3	10	42	0.3	4	30	0.24	10	30	0.42
5	27	0.3	11	45	0.3	5	30	0.27	11	30	0.45
6	30	0.3				6	30	0.30

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表 2 模型Ⅱ岩石力学参数分布

Table 2. Parameters of rock mechanics for model Ⅱ

模型Ⅱ编号	旋回号	层位号	层厚度/m	泊松比	杨氏模量/GPa
Ⅱa(旋回是由砂岩突变到泥岩构成)	3	1	12.5	0.20	20
	3	2	12.5	0.28	25
	2	3	12.5	0.2	20
	2	4	12.5	0.28	25
	1	5	12.5	0.20	20
	1	6	12.5	0.28	25
Ⅱb(旋回由砂岩渐变过渡到泥岩，其中过渡带地层是等厚的)	3	1	5	0.20	20
		2	5	0.22	22
		3	5	0.24	23
		4	5	0.26	24
		5	5	0.28	25
	2	6	5	0.20	20
		7	5	0.22	22
		8	5	0.24	23
		9	5	0.26	24
		10	5	0.28	25
	1	11	5	0.20	20
		12	5	0.22	22
		13	5	0.24	23
		14	5	0.26	24
		15	5	0.28	25
Ⅱc(旋回由砂岩渐变过渡到泥岩，其中过渡带地层不等厚)	3	1	8	0.20	20
		2	7	0.22	22
		3	5	0.24	23
		4	3	0.26	24
		5	2	0.28	25
	2	6	2	0.20	20
		7	3	0.22	22
		8	5	0.24	23
		9	7	0.26	24
		10	8	0.28	25
	1	11	10	0.20	20
		12	6	0.22	22
		13	4	0.24	23
		14	3	0.26	24
		15	2	0.28	25

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