渝东南南川地区五峰组—龙马溪组页岩气层地应力数值模拟及有利区预测

刘明; 杨瑞青; 杨风丽; 刘昊娟; 张志萍; 王玮; 户盼盼

doi:10.11781/sysydz2023061178

渝东南南川地区五峰组—龙马溪组页岩气层地应力数值模拟及有利区预测

doi: 10.11781/sysydz2023061178

1.
中国石化华东油气分公司勘探开发研究院, 南京 210000
2.
同济大学海洋与地球科学学院, 上海 200092

基金项目:

国家自然科学基金重大研究计划重点项目 92158207

中国石化华东油气分公司科研项目 34600020-22-ZC0607-0001

详细信息

作者简介:
刘明(1982—)，男，高级工程师，从事油气勘探研究。E-mail: lium.hdsj@sinopec.com

通讯作者:
杨瑞青(1993—)，女，博士研究生，从事盆地分析与石油地质研究。E-mail: 2010875@tongji.edu.cn

中图分类号: TE122
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出版历程
- 收稿日期: 2023-03-29
- 修回日期: 2023-10-07
- 刊出日期: 2023-11-28

Numerical modeling of in-situ stress and prediction of favorable area of shale gas layer in Wufeng to Longmaxi formations, Nanchuan region, southeastern Chongqing

1.
Research Institute of Exploration and Development, SINOPEC East China Oil & Gas Company, Nanjing, Jiangsu 210000, China
2.
School of Ocean and Earth Science, Tongji University, Shanghai 200092, China

摘要

摘要: 南川地区上奥陶统五峰组—下志留统龙马溪组作为重要的页岩气产能层，具有页岩层厚度大，埋藏较深，地应力复杂、方位变化快的特点，地应力场研究对于该区页岩气的有效开发具有重要作用。为明确研究区地应力场特征及展布，通过采用SHELLS有限元应力场模拟方法，以研究区断裂、地形、热流值、岩石物性参数和边界条件为约束，开展了南川地区五峰—龙马溪组的应力场有限元数值模拟研究。结果表明，南川地区最大水平主应力性质以挤压性质为主，总体上存在NW-SE、NE-SW、近EW和近SN四个主应力方向和区域；应变率整体以压应变为主，存在低应变率(数量级别≤-18)、中应变率(数量级别介于-18~-17.6)和高应变率(数量级别≥-17.6)三类区域及相应的NE-SW、NW-SE、SN和EW展布方向；断裂滑移速率性质总体以逆断层性质为主，速率介于0~0.001 2 mm/a之间。将本次模拟的最大水平主应力方向、块体应变率和断裂滑移速率结果分别与实测的钻井最大主应力方向、黔渝地区应变率性质和数量级别、区域断裂发育等数据进行对比，展现出模拟结果与实测结果较高的数据吻合度，说明了模拟结果的准确性。最后，基于模拟结果揭示出的裂缝开启性、裂缝发育情况的信息，对南川地区裂缝储层有利发育区进行了评价，预测了Ⅰ、Ⅱ两类进一步勘探和开发的页岩气裂缝储层有利发育区块。
- SHELLS有限元数值模拟 /
- 现今应力场 /
- 页岩气 /
- 五峰组—龙马溪组 /
- 南川地区
Abstract: Upper Ordovician Wufeng to Lower Silurian Longmaxi formations in Nanchuan region, as an important shale gas productive layer, is characterized by large shale thickness, deep burial depth, and complex in-situ stress with rapid direction changes. Therefore, the study of in-situ stress field is of significance for effective deve-lopment of shale gas in the study area. In order to clarify the characteristics and distribution of the in-situ stress field, the SHELLS finite element stress field modeling method, with faults, topography, heat flow, petrophysical parameters and boundary conditions as constraints, was used in the study of the stress field in the Wufeng-Longmaxi formations in the Nanchuan region.The results indicate that the maximum compressive horizontal principal stress is in thrust regime and that there are four principal stress directions and regions in general: NW-SE, NE-SW, near EW and near SN. The strain rate is in thrust regime, with three regions of low strain rate (magnitude ≤ -18), medium strain rate (magnitude between -18 and -17.6) and high strain rate (magnitude ≥ -17.6) and their corresponding NE-SW, NW-SE, SN and EW spreading directions. The fault slip rate regime is in thrust, the fault slip rates range from 0 to 0.001 2 mm/a. The modeled results of the maximum compressive horizontal principal stress, the strain rate and fault slip rate were compared with the measured data respectively, including the maximum compressive horizontal principal stress directions measured in drilled wells, the regime and magnitude of strain rate in Guizhou and Chongqing, and the properties of regional faults. The modeled results showed high agreement with the measured data, indicating the accuracy of the predicted results. Finally, based on fracture openness and fracture development revealed by modeled results, favorable fractured reservoir development zones for shale gas was evaluated, and class Ⅰ and Ⅱ zones for further exploration and development were predicted.
- numerical modeling of SHELLS finite element /
- present stress field /
- shale gas /
- Wufeng- Longmaxi formations /
- Nanchuan region
注释:

利益冲突声明/Conflict of Interests

所有作者声明不存在利益冲突。

All authors disclose no relevant conflict of interests.

作者贡献/Authors’Contributions

刘明、刘昊娟和张志萍提供资料数据；刘明、杨瑞青、杨风丽，户盼盼和王玮共同参与论文写作和修改；所有作者均阅读并同意最终稿件的提交。

The profile and data were provided by LIU Ming, LIU Haojuan and ZHANG Zhiping. The manuscript was drafted and revised by LIU Ming, YANG Ruiqing, YANG Fengli, HU Panpan and WANG Wei. All the authors have read the last version of paper and consented for submission.

HTML全文

图 1 南川地区区域构造位置

Figure 1. Tectonic location of Nanchuan region

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图 2 南川地区上奥陶统五峰组—下志留统龙马溪组断裂分布

Figure 2. Distribution of faults of Upper Ordovician Wufeng-Lower Silurian Longmaxi formations in Nanchuan region

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图 3 南川地区SHELLS应力场模拟边界条件设置

Figure 3. Boundary condition setting for SHELLS stress field modeling in Nanchuan region

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图 4 南川地区最大水平主应力方向模拟结果与分区

Figure 4. Modeled results and zones of maximum compressive horizontal principal stress direction in Nanchuan region

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图 5 南川地区块体应变率模拟结果与分区

Figure 5. Modeled results and zones of strain rates in Nanchuan region

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图 6 南川地区断裂滑移速率模拟结果与分区

Figure 6. Modeled results and zones of fault slip rate in Nanchuan region

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图 7 南川地区上奥陶统五峰组—下志留统龙马溪组应力场页岩气有利区预测

Figure 7. Predicted favorable targets for shale gas stress field in Upper Ordovician Wufeng-Lower Silurian Longmaxi formations in Nanchuan region

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表 1 南川地区上奥陶统五峰组—下志留统龙马溪组主要断裂特征

Table 1. Characteristics of major faults of Upper Ordovician Wufeng-Lower Silurian Longmaxi formations in Nanchuan region

序号	断裂简称	断裂名称	断裂性质	走向	倾向
F1	DQF	大千断裂	逆断层	NE/SN	SE/E
F2	QLXF	青龙乡断裂	逆断层	NE	SE
F3	EPQF No.1	平桥东1号断裂	逆断层	NE	NW
F4	EPQF No.2	平桥东2号断裂	逆断层	NE	NW
F5	WPQF	平桥西断裂	逆断层	NE	SE
F6	YJGF	袁家沟断裂	逆断层	NE	SE
F7	LJQF	龙济桥断裂	逆断层	NE	SE
F8	YCGF	阳春沟断裂	逆断层	SN	E

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表 2 SHELLS应力场模拟的岩石物性参数

Table 2. Petrophysical parameters in SHELLS stress field modeling

参数	数值
断裂摩擦系数	0.10
连续介质摩擦系数	0.85
Biot有效应力系数	1.00
主要断裂强度减低系数^[18]	0.00
蠕变位错剪应力系数	2.3×10⁹(地壳)，9.5×10⁴(地幔)
Q/nR/K	4 000(地壳)，18 314(地幔)
最大剪应力	5.0×10⁸(地壳)，5.0×10⁸(地幔)
常数n	3
上地幔绝热温度/K和温度梯度/(K/m)	1 412，6.1×10^-4
岩石圈最大深度/m	1.2×10⁵
运动参考点(欧拉极)	EU (61.066~85.819)
底部最大牵引力/N	2.00×10⁷
俯冲剪切带最大剪应力/(N/m)	2.00×10¹²
孔隙水密度/(kg/m³)	1 032
平均岩石密度/(kg/m³)	2 836(地壳)，3 332(地幔)
软流圈密度/(kg/m³)	3 125
热膨胀系数	2.4×10^-5(地壳)，3.94×10^-5(地幔)
热导率/[w/(m·K)]	2.7(地壳)，3.0(地幔)
单位体积热辐射	2.4×10^-5(地壳)，3.94×10^-5(地幔)
地壳、地幔岩石圈最大温度/K	1 223(地壳)，1 673(地幔)
可接受速度误差/(m/s)	1.00×10^-14
注：据文献[14, 39-41]修改。

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表 3 南川地区SHELLS应力场模拟边界条件设置

Table 3. Boundary condition setting for SHELLS stress field modeling in Nanchuan region

边界	序号	方向/(°)	大小/(mm/a)
西边界	1~16	116	1.73×10^-3
南边界	17~23	75	6.3×10^-4
南边界	24~37	自由边界
东边界	38~49	296	6.3×10^-4
东边界	50~54	自由边界
北边界	55~58	自由边界
	59~63	255	6.3×10^-4
	63~74	自由边界

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表 4 南川地区SHELLS应力场模拟结果与钻井实测值对比

Table 4. Comparison of modeled results by SHELLS stress field modeling with measured values in drilled wells in Nanchuan region

钻井	实测值/(°)	模拟值/(°)	差值/(°)
JY194-3	89	89	0
JY10-10	135	135	0
SY1	60	60	0
JY8	113	111	2
JY10	115	120	5
SY3	60	51	9
SY5	65	75	10
NY1	55	44	11
JY11	85	73	12
JY201-1	105	120	15
SY13-3	75	57	18
SY9-1	135	114	21
SY2	60	95	35

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表 5 南川地区上奥陶统五峰组—下志留统龙马溪组页岩气有利区预测原则

Table 5. Principles for prediction of favorable shale gas targets in Upper Ordovician Wufeng-Lower Silurian Longmaxi formations in Nanchuan region

页岩气裂缝储层有利发育区	评价参数及判断标准
Ⅰ类区: 同时满足A和B Ⅱ类区：二者只满足一项	A.裂缝开启性有利区	1. 最大主应力方向与旁侧断裂夹角≤45°，或 2. 与主断层距离大于2 km
Ⅰ类区: 同时满足A和B Ⅱ类区：二者只满足一项	B.裂缝发育有利区	1. 应变率数量级别＜-17.6，或 2. 断裂滑移速率＜0.00036 mm/a

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