临兴地区深部煤储层地应力场及其对压裂缝形态的控制
In-situ stress field of deep coal reservoir in Linxing area and its control on fracturing crack
-
摘要:
地应力是煤储层压裂改造的关键控制因素。基于电成像测井和水力压裂数据,结合Abaqus软件模拟,查明了研究区深部煤储层地应力空间展布规律,探讨了地应力对压裂裂缝延展的影响。结果表明,临兴地区最大水平主应力方向近似呈EW向。地应力的垂向分布具有明显分带性,存在1 200 m 和2 000 m两个临界转换深度。1 200 m以浅,地应力以垂直主应力为主;埋深介于1 200~2 000 m 时,水平主应力占据主导;当埋深超过2 000 m时,地应力再次转换为以垂直主应力为主。研究区深部煤储层地应力主要表现为最大水平主应力>垂直应力>最小水平主应(σhmax>σV>σhmin)。地应力的平面分布受埋深和构造2方面控制,埋深导致地应力整体呈南高北低、西高东低的特征;褶皱和断层使得研究区北部地应力呈条带状分布,背斜核部水平地应力较大,向斜核部及断层发育区水平地应力较小。研究区地应力组合特征决定了煤储层压裂裂缝以垂直裂缝为主,局部容易形成一些复杂缝。在天然裂隙存在的情况下,水平主应力差小于3 MPa时,压裂裂缝沿天然裂隙扩展;当水平主应力差超过6 MPa时,压裂裂缝沿最大水平主应力方向扩展;当水平主应力差超过10 MPa时,压裂裂缝基本为沿最大主应力方向的单缝。压裂实例分析表明,压裂裂缝的延伸方向和扩展特征受地应力控制明显。该研究成果以期为深部煤储层的压裂改造提供理论指导。
Abstract:In-situ stress is the key controlling factor for fracturing stimulation of coal reservoirs. Based on the data of electro imaging logging and hydraulic fracturing,combined with Abaqus software simulation,the spatial distribution characteristics of in-situ stress of deep coal reservoir in the study area was identified,and its effect on crack extension was discussed. The results indicate that the maximum horizontal principal stress direction is approximately EW in Linxing area. The vertical distribution of in-situ stress has obvious zonal distribution. There are two critical conversion depths of 1 200 m and 2 000 m,respectively. When the buried depth is less than 1 200 m,the in-situ stress is characterized by vertical principal stress;when the buried depth is between 1 200-2 000 m,the horizontal principal stress dominates;when the buried depth exceeds 2 000 m,the in-situ stress is characterized by vertical principal stress again. The in-situ stress of deep coal reservoir in study area is characterized by σhmax>σV>σhmin. The plane distribution of the in-situ stress is controlled by both the buried depth and the structure. The burial depth causes the in-situ stress to be high in the south and low in the north,and high in the west and low in the east. The horizontal in-situ stress in the part is relatively large,and the horizontal in-situ stress in the syncline core and the fault development area is relatively small. The characteristics of in-situ stress combination in the study area determine that the fracture is dominated by vertical cracks,and some complex cracks are easily formed locally. In the presence of natural fractures,when the horizontal principal stress difference is less than 3 MPa,the fracturing cracks expand along the natural fractures;when the horizontal principal stress difference exceeds 6 MPa,the fracturing cracks expand along the maximum horizontal principal stress direction;when the horizontal principal stress difference exceeds 10 MPa,the fracturing cracks is basically a single crack along the maximum principal stress direction. The analysis of fracturing examples shows that the extension direction and propagation characteristics of cracks are obviously controlled by in-situ stress. The research results provide theoretical guidance for fracturing transformation of deep coal reservoirs.
-
-
期刊类型引用(19)
1. 刘尽贤,郭涛,周亚彤,李东阳,金晓波. 渝东南南川地区龙潭组煤储层可压性特征及改造效果分析. 石油实验地质. 2025(01): 77-88 . 百度学术
2. 范立勇,周国晓,杨兆彪,王怀厂,卢本举,张宝鑫,陈宇航,李存磊,王彦卿,顾俊雨. 鄂尔多斯盆地深部煤层气差异富集的地质控制. 煤炭科学技术. 2025(01): 203-215 . 本站查看
3. 赵毅鑫,赵良辰,杨东辉,边华,杨哲,宫智馨. 基于改进组合弹簧模型的矿井地应力场计算方法. 采矿与岩层控制工程学报. 2024(01): 103-116 . 百度学术
4. 熊先钺,甄怀宾,李曙光,王红娜,张雷,宋伟,林海,徐凤银,李忠百,朱卫平,王成旺,陈高杰. 大宁–吉县区块深部煤层气多轮次转向压裂技术及应用. 煤田地质与勘探. 2024(02): 147-160 . 百度学术
5. 于国栋,鞠玮,杨兆彪. 大宁—吉县地区5号煤层现今地应力预测及其对煤层气开发的影响. 科学技术与工程. 2024(13): 5286-5295 . 百度学术
6. 安琦,杨帆,杨睿月,黄中伟,李根生,公衍瑾,于伟. 鄂尔多斯盆地神府区块深部煤层气体积压裂实践与认识. 煤炭学报. 2024(05): 2376-2393 . 百度学术
7. 高德利,鲜保安,毕延森. 水平井尾管完井与钻井一体化设计控制技术. 石油勘探与开发. 2024(04): 878-888 . 百度学术
8. GAO Deli,XIAN Baoan,BI Yansen. Integrated design and control technology of liner completion and drilling for horizontal wells. Petroleum Exploration and Development. 2024(04): 1009-1021 . 必应学术
9. 韩文龙,李勇,王力,王延斌. 柿庄北煤层气区块煤层压裂裂缝扩展规律及影响因素. 煤炭科学技术. 2024(S1): 127-136 . 本站查看
10. 张健雅,于海成,张华. 地球化学元素分析在判别沉积环境中的应用——以开平向斜二叠系含煤地层为例. 中国煤炭地质. 2024(11): 15-20+25 . 百度学术
11. 李可心,张聪,李俊,刘春春,杨瑞强,张武昌,李邵楠,任智剑. 沁水盆地南部煤层气水平井射孔优化. 新疆石油地质. 2024(05): 581-589 . 百度学术
12. 皇甫展鸿,吕文雅,唐英航,曾联波,邓泽,吴雨蕙. 深层煤层气储层现今地应力测井计算方法:以大宁—吉县地区本溪组煤层为例. 地质科学. 2024(06): 1662-1674 . 百度学术
13. 孔祥伟,谢昕,王存武. 基于综合可压指数的煤层气水平井压裂分段参数优化. 油气藏评价与开发. 2024(06): 925-932+941 . 百度学术
14. 王舵,刘之的,王成旺,刘天定,陈高杰,郝晋美,孙博文. 鄂尔多斯盆地DJ区块深部煤储层地质-工程甜点测井评价技术. 石油与天然气地质. 2024(06): 1772-1788 . 百度学术
15. 牟朋威,李珮杰,姚艳斌,刘大锰,马立民,孙晓晓,邱勇凯. 鄂尔多斯盆地佳县地区深部煤层地应力特征及其对储层物性的控制. 石油与天然气地质. 2024(06): 1640-1652 . 百度学术
16. 李贵山,于振锋,杨晋东,宋新亚,郭琛. 沁水盆地郑庄区块煤层气水平井钻井体系优化. 煤炭科学技术. 2023(04): 118-126 . 本站查看
17. 马代兵,陈立超. 煤层气直井压裂效果及其对产能影响——以窑街矿区为例. 煤炭科学技术. 2023(06): 130-136 . 本站查看
18. 张兵,冯兴强,米洪刚,张海峰,史浩,苏羽,吴林. 鄂尔多斯盆地临兴地区致密砂岩储层岩石力学参数和地应力分析. 中国海上油气. 2023(06): 51-59 . 百度学术
19. 李倩,李童,蔡益栋,刘大锰,李凌菲,汝智星,殷婷婷. 煤层气储层水力裂缝扩展特征与控因研究进展. 煤炭学报. 2023(12): 4443-4460 . 百度学术
其他类型引用(5)
计量
- 文章访问数: 100
- HTML全文浏览量: 4
- PDF下载量: 473
- 被引次数: 24