韩城区块西北部三维地应力场反演分析

赵海峰; 杨昌增; 冯堃; 甄怀宾

doi:10.13347/j.cnki.mkaq.2023.10.003

韩城区块西北部三维地应力场反演分析

赵海峰^1,,
杨昌增²,
冯堃^{3, 4},
甄怀宾^{3, 4}

1.
中国石油大学（北京）石油工程学院，北京 102249
2.
中国石油塔里木油田分公司，新疆库尔勒 841901
3.
中石油煤层气有限责任公司，北京 100028
4.
中联煤层气国家工程研究中心有限责任公司，北京 100095

基金项目: 国家自然科学基金资助项目（11672333）

详细信息

作者简介:
赵海峰（1980—），男，安徽舒城人，教授，博士，从事石油工程力学方面的教学与研究工作。E-mail：zhaohf@cup.edu.cn

中图分类号: TD712
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- 文章访问数: 68
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出版历程
- 收稿日期: 2022-12-29
- 网络出版日期: 2023-10-17
- 刊出日期: 2023-10-17

Inversion analysis of three-dimensional geostress field in northwest Hancheng Block

1.
School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
2.
Petrochina Tarim Oilfield Company, Korla 841901
3.
PetroChina Coalbed Methane Company Litmted, Beijing 100028, China
4.
China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China

摘要

摘要:
为改善当前地应力场研究对经验公式的依赖现状，以韩城区块地质条件为背景，提出了通过有限元反演回归计算地应力的方法，根据韩城区块的地质概况建立起较为精确的三维地质模型，以现场水压致裂法所测得的地应力实测资料为基础，采用三维有限元回归分析法拟合实测数据，得到研究区的地应力场分布规律。研究结果表明：煤层三向应力从大到小依次为垂向应力、水平最大主应力、水平最小主应力；煤层的整体应力差处于2～4 MPa之间，在北西部存在较大应力差；煤层整体的应力方向趋势呈北偏东45°；误差大小不超过20%，能够满足工程实际的要求。
- 地应力场 /
- 水压致裂法 /
- 多元线性回归 /
- 韩城区块 /
- 煤层气
Abstract:
In order to improve the current situation of relying on empirical formulas in the current research on goestress fields, a finite element inversion and regression calculation method of goestresss is proposed based on the geological conditions of Hancheng Block. First, a more accurate three-dimensional geological model is established according to the geological situation of Hancheng Block; the three-dimensional finite element regression analysis method is used to fit the measured data, and finally the distribution law of the goestress field in the study area is obtained. The research results show that the three-dimensional goestress of the coal seam is in descending order: vertical stress, horizontal maximum principal stress, and horizontal minimum principal stress; the overall stress difference of the coal seam is between 2 MPa and 4 MPa, and there is a larger stress in the northwest; the overall stress direction trend of the coal seam is 45 degrees north to east; the error size does not exceed 20%, which meets the actual requirements of the project.
- goestress field /
- hydraulic fracturing method /
- multiple linear regression /
- Hancheng Block /
- coalbed methane

HTML全文

图 1 研究区块构造纲要图

Figure 1. Outline diagram of research block structure

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图 2 测点布置图

Figure 2. Measuring points layout

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图 3 建模思路图

Figure 3. Modeling idea diagram

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图 4 三维有限元计算模型

Figure 4. 3D finite element calculation model

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图 5 煤层顶面水平最大主应力大小云图

Figure 5. Cloud diagram of horizontal maximum principal stress on top surface of coal seam

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图 6 煤层顶面水平应力差云图

Figure 6. Cloud diagram of horizontal stress difference on top surface of coal seam

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图 7 煤层顶面水平最大主应力方向

Figure 7. Direction of maximum horizontal principal stress on top surface of coal seam

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表 1 钻孔水压致裂法地应力测量结果

Table 1 Measurement results of in-situ stress by drilling hydraulic fracturing method

测点	测深/m	应力/MPa			破裂方位/(°)
测点	测深/m	最大主应力	最小主应力	垂向应力	破裂方位/(°)
1	754	17.65	11.40	18.10
2	918	18.09	13.10	22.03
3	804	18.46	16.50	19.30
4	836	19.74	17.00	20.06	N42°E
5	798	21.19	11.90	19.15
6	1002	23.02	12.50	24.05	N43°E

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表 2 坐标系下实测地应力分量值

Table 2 Measured geostress component values in the coordinate system MPa

$ {\sigma }_{1} $	$ {\sigma }_{2} $	$ {\sigma }_{3} $	$ {\sigma }_{x} $	$ {\sigma }_{y} $	$ {\sigma }_{z} $	$ {\tau }_{yz} $	$ {\tau }_{xz} $	$ {\tau }_{xy} $
18.10	17.65	11.40	20.54	4.42	18.10	0.00	0.00	−3.13
19.15	18.09	11.90	21.20	4.38	19.15	0.00	0.00	−3.10
19.30	18.46	12.50	23.39	4.21	19.30	0.00	0.00	−2.98
20.06	19.74	12.70	23.86	4.98	20.06	0.00	0.00	−3.52
22.03	21.19	13.20	24.31	5.65	22.03	0.00	0.00	−4.00
24.05	23.02	14.10	26.24	6.31	24.05	0.00	0.00	−4.46

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表 3 实测数据与回归计算值对比

Table 3 Comparison of measured data and regression calculated values

测点编号	测深/m	最大水平主应力/MPa			最小水平主应力/MPa			垂向应力/MPa
测点编号	测深/m	实测值	计算值	误差	实测值	计算值	误差	实测值	计算值	误差
1	752	17.7	20.3	2.7	11.4	13.3	1.9	18.1	18.6	0.5
2	916	21.1	25.8	4.7	13.1	15.3	2.2	22.0	23.5	1.4
3	803	27.5	30.4	2.9	16.5	20.1	3.6	19.3	20.1	0.8
4	835	27.6	29.4	1.8	17.0	21.6	4.6	20.1	21.0	1.0
5	796	18.1	20.3	2.2	11.9	13.4	1.5	19.2	20.6	1.4
6	1000	23.5	25.7	2.2	12.5	14.3	1.8	24.0	25.0	0.9

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