深层碳酸盐岩储层溶洞围岩应力分布研究

周汉国; 郭建春; 李静; 彭成乐; 王昌; 高帅; 郑金凯

doi:10.12090/j.issn.1006-6616.2018.24.01.004

深层碳酸盐岩储层溶洞围岩应力分布研究

doi: 10.12090/j.issn.1006-6616.2018.24.01.004

周汉国^{1, 2,},
郭建春¹,
李静³,
彭成乐⁴,
王昌³,
高帅³,
郑金凯³

1.
西南石油大学油气藏地质及开发工程国家重点实验室, 四川成都 610500
2.
中国石化胜利油田分公司油气勘探管理中心, 山东东营 257000
3.
中国石油大学(华东)地质力学与工程研究所, 山东青岛 266580
4.
河北康保广恒新能源有限公司, 河北张家口 075000

基金项目:

国家自然科学基金项目 41272141

国家科技重大专项 2016ZX05002-002

详细信息

作者简介:
周汉国(1969-), 男, 博士生, 高级工程师, 主要从事油气勘探开发技术研究及管理工作。E-mail:zhouhanguoupc@163.com

中图分类号: P554
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- 被引次数: 0
出版历程
- 收稿日期: 2017-06-12
- 修回日期: 2017-11-15
- 刊出日期: 2018-02-01

DISTRIBUTION OF SURROUNDING ROCK STRESS IN DEEP CARBONATE RESERVOIR KARST CAVE

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China
2.
Manage Center of Oil and Gas Exploration of SINOPEC Shengli Oilfield Company, Dongying 257000, Shandong, China
3.
Research Institute of Geological Mechanics and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
4.
Hebei Kangbao Guangheng New Energy Co., Ltd., Zhangjiakou 075000, Hebei, China

摘要

摘要: 以冀中凹陷任北奥陶系碳酸盐岩储层为例，基于油田测井资料及岩石力学实验确定了研究区岩石力学参数，对目标储层典型的长椭圆形孤立落水溶洞围岩应力进行了数值模拟，并根据第三强度理论研究了围岩破坏情况。研究结果表明，（1）溶洞在上覆岩层压力和侧向压力的共同作用下，长椭圆形溶洞围岩的应力集中效应带为9倍的半径范围；（2）长椭圆形溶洞围岩应力以压应力为主，主要集中分布在洞顶和洞底；（3）溶洞填充性对其围岩主应力差及破坏范围影响很大。当填充压力小于0.1 MPa时，溶洞围岩主应力差及破坏区域范围随填充压力的增大而增大；而当填充压力大于0.1 MPa时，溶洞围岩主应力差及破坏区域范围随填充压力的增大均呈减小的趋势。
- 碳酸盐岩 /
- 溶洞 /
- 围岩应力 /
- 数值模拟
Abstract: The Ordovician carbonate oil pool in northern Renqiu of the Jizhong depression is taken as an example in this article. The rock mechanical parameters in the study area were calculated based on the log data of the oil field, and the typical isolated water long elliptic karst cave of the target reservoir was selected, with its surrounding rock stress and its damage zone calculated by numerical simulation and third strength theory. The results show that:1) Under the combined action of overburden pressure and lateral pressure, the stress concentration effect zone of the long elliptic karst cave surrounding rock is 9 times of the radius. 2) The surrounding rock stress of long elliptic karst cave is mainly compressive stress, mainly concentrating in the top and the bottom. 3) The filling property of karst cave has great influence on the principal stress difference and damage range of surrounding rock. For the long-elliptic karst cave, the principal stress difference and shear damage of the surrounding rock increase with the increase of filling pressure when the filling pressure is less than 0.1 MPa; while the principal stress difference and the shear damage range of the surrounding rock gradually decrease with the increase of filling pressure when the filling pressure is more than 0.1 MPa.
- carbonate rocks /
- karst cave /
- surrounding rock stress /
- numerical simulation

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图 1 长椭圆形溶洞几何模型及约束加载图

Figure 1. Schematic diagram of the geometric model and the constraint loading in the long ellipse karst cave

下载: 全尺寸图片幻灯片

图 2 长椭圆形溶洞围岩最大主应力沿径向变化图

Figure 2. Diagram of the radial variation of maximum principal stress of the surrounding rock in long ellipse karst cave

下载: 全尺寸图片幻灯片

图 3 长椭圆形溶洞围岩最小主应力沿径向变化图

Figure 3. Diagram of the radial variation of minimum principalstress of the surrounding rock in long ellipse karst cave

下载: 全尺寸图片幻灯片

图 4 长椭圆形溶洞围岩主应力差分布图(负为压)

Figure 4. Distribution of principal stress difference of the surrounding rock in long ellipse karst cave (Pressure is negative)

下载: 全尺寸图片幻灯片

图 5 长椭圆形溶洞围岩破坏区域分布图

Figure 5. Distribution of failure zone of the surroundingrock in long ellipse karst cave

下载: 全尺寸图片幻灯片

图 6 长椭圆形溶洞应力随填充压力的变化曲线

Figure 6. Curves of the change of stress with the filling pressure in long ellipse karst cave

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图 7 长椭圆形溶洞围岩在填充压力作用下的剪切破坏图

Figure 7. Shear failure of the surrounding rock in long ellipse karst cave under the filling pressure

下载: 全尺寸图片幻灯片

表 1 任76井岩石力学特性

Table 1. Rock mechanics parameters of Ren 76 well

岩层深度/m	纵波时差μs/m	横波时差μs/m	动态弹性模量/10⁴ MPa	动态泊松比	静态弹性模量/10⁴ MPa	静态泊松比	抗压强度/MPa	剪切强度/MPa	抗张强度/MPa	内摩擦角/(°)	垂直应力/MPa	最大水平主应力/MPa	最小水平主应力/MPa
3119.7	212.27	411.73	5.7945	0.445	4.1365	0.2381	177.02	17.91	14.75	19.23	105.47	108.35	97.44
3126.7	219.49	418.41	6.1218	0.483	4.3687	0.2476	168.21	16.46	14.02	19.29	105.69	107.93	97.31
3130.5	204.98	409.76	5.9362	0.458	4.2370	0.2413	177.76	18.62	14.81	19.20	105.79	109.57	98.33
3166.0	222.8	420.34	6.0547	0.452	4.3211	0.2398	166.63	16.09	13.89	19.30	106.56	108.88	98.03
3171.6	214.63	412.31	6.1642	0.453	4.3988	0.2401	177.27	17.76	14.77	19.24	106.73	109.50	98.55
3180.6	221.32	419.26	6.1818	0.480	4.4113	0.2468	167.78	16.30	13.98	19.30	106.87	109.36	98.42
3185.5	223.88	421.57	6.3947	0.505	4.5623	0.2531	164.86	15.85	13.74	19.31	107.02	109.29	98.45
3193.4	215.45	412.4	6.0991	0.491	4.3526	0.2496	177.64	16.74	14.80	19.24	107.22	109.95	98.97
3204.4	223.29	423.37	6.1386	0.495	4.3806	0.2507	160.62	15.45	13.38	19.33	107.47	109.89	99.03

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表 2 研究区岩石力学特性

Table 2. Rock mechanics parameters of the study area

岩石类型	静态弹性模量/10⁴ MPa	静态泊松比	剪切强度/MPa	抗张强度/MPa	抗拉强度/MPa	内摩擦角/(°)	垂向应力/MPa	最大水平主应力/MPa	最小水平主应力/MPa
石灰岩	4.3521	0.2452	16.79	14.24	170.34	19.28	106.50	109.20	98.28

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