樊庄北部3号煤层现今应力场分布数值模拟

doi:10.11885/j.issn.16745086.2015.06.02.02

西南石油大学学报(自然科学版) ›› 2017, Vol. 39 ›› Issue (4): 81-89.DOI: 10.11885/j.issn.16745086.2015.06.02.02

樊庄北部3号煤层现今应力场分布数值模拟

尹帅¹, 丁文龙², 高敏东³, 周广照⁴

1. 西安石油大学地球科学与工程学院, 陕西西安 710065;
2. 中国地质大学(北京)能源学院, 北京海淀 100083;
3. 山东新汶矿业集团有限责任公司, 山东新汶 271219;
4. 西南石油大学地球科学与技术学院, 四川成都 610500

收稿日期:2015-06-02 出版日期:2017-08-01 发布日期:2017-08-01
通讯作者: 丁文龙,E-mail:dingwenlong2006@126.com
作者简介:尹帅,1989年生,男,汉族,山东新泰人,博士,主要从事石油构造分析及裂缝评价等方面的研究工作。E-mail:583018776@qq.com;丁文龙,1965年生,男,汉族,河南南阳人,教授,博士生导师,主要从事石油构造分析与控油作用、非常规油气构造和裂缝及其与含气量关系等方面的教学与科研工作。E-mail:dingwenlong2006@126.com;高敏东,1973年生,男,汉族,山东新泰人,高级工程师,主要从事顶板运动规律与控制、顶板支护技术、采矿技术与工艺等方面的研究工作。E-mail:Jscgmd@163.com;周广照,1990年生,男,汉族,山东阳谷人,硕士研究生,主要从事储层评价与测井解释、石油地质软件编程嵌入式二次开发等方面的研究工作。E-mail:790505814@qq.com
基金资助:
国家自然科学基金（41572130，41372139，41072098）；国家科技重大专项（2011ZX05018001，2011ZX05009002，2011ZX05033）

The In-situ Stress Field Distribution Numerical Simulation of No.3 Coal Seam in the North of Fanzhuang CBM Well Blocks

YIN Shuai¹, DING Wenlong², GAO Mindong³, ZHOU Guangzhao⁴

1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an, Shannxi 710065, China;
2. School of Energy Resources, China University of Geosciences(Beijing), Haidian, Beijing 100083, China;
3. Shandong Xinwen Mining Group Co. Ltd., Xintai, Shandong 271219, China;
4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2015-06-02 Online:2017-08-01 Published:2017-08-01

摘要/Abstract

摘要： 为了制定针对樊庄区块北部煤层气井区3号煤层的有效缝网改造措施，利用工区二维地震资料对石炭系二叠系的构造样式及断层特征进行解释，在此基础上，利用压裂法、成像测井及有限元数值模拟方法对山西组3号煤层现今应力场特征进行研究。结果表明，3号煤层主应力满足σ_H > σ_v > σ_h，各主应力随深度的增加而增加，σ_v、σ_H及σ_h的应力梯度分别为0.025 MPa/m、0.018 MPa/m及0.013 MPa/m。3号煤层的σ_H及σ_h均略高于其顶底板砂泥岩地层1.0~2.5 MPa，这种应力特征易造成压裂穿层，缝高难于控制；3号煤层σ_H-σ_h为2.0~6.0 MPa，且随深度增加而增加，这是造成工区埋深相对较浅的煤层压裂效果较好、产气量相对较高的重要原因。研究区现今地应力方向在SN及NNE之间，与喜马拉雅中晚期构造挤压运动相关。有限元模拟显示，煤储层应力场平面分布特征受控于埋深、岩性、褶皱及断层等因素。3号煤层σ_H为15.6~21.0 MPa；σ_h为12.5~16.0 MPa，预测结果与实测值相符。

关键词: 樊庄区块, 煤层气, 山西组, 应力, 有限元数值模拟

Abstract: To develop effective measures for improving the fracture net of the No. 3 coal seam in the northern Fanzhuang wellblocks, we analyzed Permo-Carboniferous strata tectonic patterns and fault characteristics of the CBM well blocks using 2-D seismic data. Accordingly, the stress field characteristics of the No. 3 coal seam in the Shanxi Formation were analyzed using multiple approaches, including the fracturing method, image logging, and finite element simulation. The results show that values of the three principal stresses follow the order σ_H > σ_v > σ_h; they all increase with depth. σ_v shows the largest stress gradient of about 0.025 MPa/m, followed by σ_H, at about 0.018 MPa/m, and σ_h at about 0.013 MPa/m. The values of σ_H and σ_h of the No. 3 coal seam are slightly higher than those in the sand/shale formation of the roof and floor by about 1.0-2.5 MPa, leading to the formation of a fracturing wear layer and making fracture height control difficult. The values of σ_H-σ_h are mainly distributed in the range of 2.0-6.0 MPa. This is also the main cause for the high fracturing effect and gas production of the relatively shallow No. 3 coal seam. The imaging logging induced fracture analysis shows that the in-situ stress direction in the study area is located between SN and NNE, which is associated with the Himalayan middle-late tectonic compression movement. The complex local structure characteristics and the existence of faults can result in a change in this direction. Results from finite element simulation of the study area show that the stress plane distribution characteristics are dominated by multiple factors such as buried depth, lithology, folds, and faults. The values of σ_H and σ_h of the No. 3 coal seam from simulation are distributed between 15.6-21.0 MPa and 12.5-16.0 MPa, respectively, and are consistent with the measured results.

Key words: Fanzhuang wellblock, CBM, Shanxi Formation, No.3 coal seam, stress, finite element, numerical simulation

中图分类号:

TE132

尹帅, 丁文龙, 高敏东, 周广照. 樊庄北部3号煤层现今应力场分布数值模拟[J]. 西南石油大学学报(自然科学版), 2017, 39(4): 81-89.

YIN Shuai, DING Wenlong, GAO Mindong, ZHOU Guangzhao. The In-situ Stress Field Distribution Numerical Simulation of No.3 Coal Seam in the North of Fanzhuang CBM Well Blocks[J]. 西南石油大学学报(自然科学版), 2017, 39(4): 81-89.

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樊庄北部3号煤层现今应力场分布数值模拟

The In-situ Stress Field Distribution Numerical Simulation of No.3 Coal Seam in the North of Fanzhuang CBM Well Blocks

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