苏北盆地高邮凹陷阜宁组二段深层页岩储层地应力方向及主控因素

严泽宇; 梁兵; 孙雅雄; 段宏亮; 邱旭明

doi:10.11781/sysydz2024061187

苏北盆地高邮凹陷阜宁组二段深层页岩储层地应力方向及主控因素

doi: 10.11781/sysydz2024061187

严泽宇^1,,
梁兵²,
孙雅雄^{2, 3, ,},
段宏亮²,
邱旭明²

1.
中国石化石油物探技术研究院有限公司, 南京 211103
2.
中国石化江苏油田分公司, 江苏扬州 225009
3.
东北石油大学地球科学学院, 黑龙江大庆 163008

基金项目:

国家自然科学基金面上项目 42072155

中国石化科技开发部项目 P23189

中国石化科技开发部项目 P24207

中国石化江苏油田分公司科研课题 JS24038

详细信息

作者简介:
严泽宇(1998—), 男, 硕士, 助理工程师, 从事油气勘探开发工作。E-mail: yanzy.swty@sinopec.com

通讯作者:
孙雅雄(1993—), 男, 博士, 副研究员, 从事非常规油气地质理论与评价研究。E-mail: sunyaxiong2015@163.com

中图分类号: TE122.23
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- 文章访问数: 54
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- 被引次数: 0
出版历程
- 收稿日期: 2024-02-29
- 修回日期: 2024-10-09
- 刊出日期: 2024-11-28

In-situ stress orientation and main controlling factors of deep shale reservoirs in the second member of Paleogene Funing Formation in Gaoyou Sag, Subei Basin

1.
SINOPEC Geophysical Research Institute Co., Ltd., Nanjing, Jiangsu 211103, China
2.
SINOPEC Jiangsu Oilfield Company, Yangzhou, Jiangsu 225009, China
3.
School of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang 163008, China

摘要

摘要: 苏北盆地高邮凹陷阜宁组二段页岩油资源量超7亿吨，但该区构造、应力双复杂的地质条件对页岩油勘探开发造成较大影响，尤其是现今地应力方向的认识不清，制约了水平井井组方案的部署和压裂方案的设计与优化。基于区域震源机制解、特殊测井和水平井压裂微地震监测等资料，结合波速各向异性、古地磁等实验测试分析资料，开展了各类地应力方向解释方法在深层页岩储层中的适用性研究，查明了花庄地区现今地应力的分布特征，并对其影响因素进行了分析。高邮凹陷阜二段现今水平最大主应力方向主要分布在40°—55°，平均方位角为45°，即现今水平最大主应力方向为NE向。平面上，研究区地应力方向与大区域上应力方向具有较小的应力偏转，主要受构造格局的影响；此外，断层附近存在应力扰动带，扰动带内应力偏转较为明显，扰动带的宽度与断层的断距和延伸长度成正相关。通过对比分析，认为微地震监测、诱导裂缝/井壁崩落、岩心实测、阵列声波各向异性的适用性逐级降低，阵列声波测井中的波速各向异性受平面上岩相相变的影响较大。结合地应力方向解释结果、天然裂缝优势走向，建议该区水平井的部署方位为SE155°—SSE170°。
- 页岩储层 /
- 地应力方向 /
- 阜宁组 /
- 古近系 /
- 高邮凹陷 /
- 苏北盆地
Abstract: The shale oil resources in the second member of the Paleogene Funing Formation in the Gaoyou Sag, Subei Basin exceed 700 million tons. However, the complex geological conditions of both its structure and stress significantly impact the shale oil exploration and development in this area. In particular, the lack of clarity regarding the present-day in-situ stress orientations constrains the deployment of horizontal well groups and the design and optimization of fracturing projects. In this study, the applicability of various methods for interpreting in-situ stress orientations in deep shale reservoirs was investigated based on data from regional focal mechanism solutions, specialized logging, and microseismic monitoring of horizontal well fracturing, as well as the experimental analysis such as velocity anisotropy and paleomagnetic tests. The distribution characteristics of the present-day in-situ stress in the Huazhuang area were identified, and their influencing factors were analyzed. The results indicated that the present-day maximum horizontal principal stress direction in the second member of the Funing Formation mainly ranged from 40° to 55°, with an average azimuth of 45°, indicating a northeastward orientation. In the planar view, the in-situ stress orientation in the study area exhibited minor stress deviations on a larger regional scale, mainly influenced by the structural patterns. Furthermore, stress perturbation zones were found near faults, where stress deviations were more pronounced, and the width of these perturbation zones was positively correlated with fault displacement and extension length. Comparative analysis suggested a decreasing applicability of microseismic monitoring, induced fractures/wellbore collapses, core measurements, and array acoustic anisotropy. Specifically, the velocity anisotropy in array acoustic logging was significantly influenced by lithological phase transitions on a planar scale. Based on the interpretation of stress orientations and the dominant trends of natural fractures, the recommended horizontal well deployment azimuth for this area is SE155° to SSE170°.
- shale reservoir /
- in-situ stress orientation /
- Funing Formation /
- Paleogene /
- Gaoyou Sag /
- Subei Basin
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

所有作者均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 manuscript was drafted and revised by all authors. All authors have read the last version of the paper and consented to its submission.

HTML全文

图 1 苏北盆地高邮凹陷阜宁组二段断裂特征

据方志雄等^[21]修改。
a.苏北盆地构造单元划分；b.高邮凹陷阜二段断裂体；c.高邮凹陷NNW—SSE向剖面；d.高邮凹陷地层综合柱状图。

Figure 1. Fault characteristics of the second member of Funing Formation in Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 2 郯庐断裂带南段及其邻区水平最大主应力轴分布

据宋尚武等^[12]修改。

Figure 2. Distribution of maximum horizontal principal stress axes in southern section of Tanlu Fault and surrounding areas

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图 3 苏北盆地高邮凹陷HY7井阜宁组二段岩心波速各向异性实验曲线

Figure 3. Experimental curve of velocity anisotropy in core samples from the second member of Funing Formation in well HY7, Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 4 苏北盆地高邮凹陷花庄地区阜宁组二段页岩油井分布

Figure 4. Distribution of shale oil wells in the second member of Funing Formation in Huazhuang area, Gaoyou Sag, Subei Basin

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图 5 苏北盆地高邮凹陷阵列声波测井地层各向异性解释成果(HY7井)

Figure 5. Formation anisotropy interpretation results from array acoustic logging in well HY7, Gaoyou Sag, Subei Basin

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图 6 苏北盆地高邮凹陷阜宁组二段成像测井诱导裂缝图像

Figure 6. Images of drilling-induced fractures from imaging logging of the second member of Funing Formation in Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 7 苏北盆地高邮凹陷阜宁组二段微地震事件及解释地应力方向

a.微地震事件俯视图(底图为阜二段中部埋深等值线图，单位m)；b.H2CHF井微地震解释地应力方向统计直方图；c.HY5HF井微地震解释地应力方向统计直方图。

Figure 7. Microseismic events and interpreted in-situ stress orientations in the second member of Funing Formation in Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 8 苏北盆地高邮凹陷阜宁组二段地应力方向分布

Figure 8. Distribution of in-situ stress orientations in the second member of Funing Formation in Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 9 苏北盆地高邮凹陷花庄地区阜宁组二段断层附近应力扰动带宽度变化规律

底图据翁剑桥等^[31]修改。

Figure 9. Width variations in stress perturbation zones near faults in the second member of Funing Formation, Huazhuang area, Gaoyou Sag, Subei Basin

下载: 全尺寸图片幻灯片

图 10 结合天然裂缝走向和地应力方向的测试结果建议水平井的部署方位

Figure 10. Recommended horizontal well deployment orientation based on test results of natural fracture and in-situ stress orientations

下载: 全尺寸图片幻灯片

表 1 苏北盆地高邮凹陷阜宁组二段岩心实测地应力方向统计

Table 1. Statistics of measured in-situ stress orientations in core samples from the second member of Funing Formation in Gaoyou Sag, Subei Basin

井号	层位	深度/m	标志线古地磁定向方向	水平最大主应力与标志线夹角	测试方法	水平最大主应力方向
HY1井	阜二段页Ⅴ亚段	3 586.02	212.3°	191.5°	波速各向异性	NE43.8°
HY7井	阜二段页Ⅳ亚段	4 080.40	122.0°	135.0°	波速各向异性	NEE77.0°

下载: 导出CSV

表 2 苏北盆地高邮凹陷不同方法分析水平最大主应力方向结果对比分析

Table 2. Comparative analysis of maximum horizontal principal stress orientations interpreted by different methods in Gaoyou Sag, Subei Basin

分析方法	水平最大主应力方向
分析方法	HY1井	H2C井	HY3井	HY7井
岩心实测	43.6°			77.0°
测井波速各向异性	65°—75°(*)		90°—100°(*)	65°—75°
成像测井诱导裂缝	35°—50°	70°—80°	65°—75°	70°—80°
成像测井井壁崩落			65°—75°	70°—80°
与区域应力方向一致性	是	否	否	否
注：“*”表示判定为不准确。

下载: 导出CSV

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