[1]赵宁,司马立强,刘志远,等.基于地层条件下力学试验的致密砂岩可压裂性评价[J].测井技术,2022,46(02):127-134.[doi:10.16489/j.issn.1004-1338.2022.02.001]
 ZHAO Ning,SIMA Liqiang,LIU Zhiyuan,et al.Fracturing Evaluation of Tight Sandstone Based on Rock Mechanical Experiment Under Formation Conditions[J].WELL LOGGING TECHNOLOGY,2022,46(02):127-134.[doi:10.16489/j.issn.1004-1338.2022.02.001]
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基于地层条件下力学试验的致密砂岩可压裂性评价()
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《测井技术》[ISSN:1004-1338/CN:61-1223/TE]

卷:
第46卷
期数:
2022年02期
页码:
127-134
栏目:
岩石物理
出版日期:
2022-05-01

文章信息/Info

Title:
Fracturing Evaluation of Tight Sandstone Based on Rock Mechanical Experiment Under Formation Conditions
文章编号:
1004-1338(2022)02-0127-08
作者:
赵宁12 司马立强1 刘志远3 耿辉4 郭宇豪1 马骏1
(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.埃因霍芬理工大学 机械工程学院, 荷兰 埃因霍芬 5612AZ; 3.中国石化石油勘探开发研究院, 北京 100083; 4.中国石油长庆油田分公司陇东天然气项目部, 甘肃 庆阳 745000)
Author(s):
ZHAO Ning12 SIMA Liqiang1 LIU Zhiyuan3 GENG Hui4 GUO Yuhao1 MA Jun1
(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 2. Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven, 5612AZ, Netherlands; 3. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China; 4. Longdong Natural Gas Project Department, Changqing Oilfield Company, PetroChina, Qingyang, Gansu 745000, China)
关键词:
测井评价 致密砂岩 可压裂性 下石盒子组 鄂尔多斯盆地
Keywords:
log evaluation tight sandstone fracrability Lower Shihezi formation Ordos basin
分类号:
P631.84
DOI:
10.16489/j.issn.1004-1338.2022.02.001
文献标志码:
A
摘要:
致密砂岩储层具有物性差、地层压力异常、隔夹层发育等工程地质特征,通常需通过压裂改造实现效益开采。以鄂尔多斯盆地杭锦旗地区下石盒子组致密砂岩可压裂性评价为目标,通过理论分析并结合现场实际,研究了岩石的力学强度特性、力学参数及地应力纵向分布规律,认为脆性指数、断裂韧性以及水平地应力差指数为储层可压裂性的关键控制因素,在此基础上利用层次分析法建立了可压裂性综合评价方法。研究结果表明:下石盒子组致密砂岩地层的岩石力学参数以及地应力分布差异明显,储层间存在高应力和高强度隔挡夹层,这种差异化的储层分布特征使其具备压裂改造形成复杂沟通缝网的地质力学潜力,在压裂作业中应重点考虑地层的可压裂性及可压层段的优选,避免受隔挡夹层的影响造成压裂缝网纵向沟通能力不足。基于脆性指数、断裂韧性和水平地应力差指数构建的可压裂性指数能够有效确定储层最佳压裂层段,当其大于0.25时,储层可压裂级别为Ⅰ级,在实际的施工作业中,需根据地层实际情况选用不同的工程力学参数。该研究成果能为下石盒子组致密砂岩压裂改造提供借鉴与思路。
Abstract:
Because of the characteristics of poor physical properties, abnormal formation pressure, development of high-strength interlayer, etc., effective exploitation requires reservoir fracturing. Thus, the fracability of the tight sandstone reservoir should be evaluated. To achieve this goal, the tight sandstone reservoir of the Lower Shihezi formation in the Hangjinqi area of the Ordos basin are selected as the research target, and the rock mechanics tests combined with theoretical analysis and field practice are carried out to study the mechanical strength characteristics, deformation and failure characteristics, mechanical parameters and longitudinal distribution of in-situ stress of reservoir. The brittleness index, fracture toughness, and horizontal in-situ stress difference index are regarded as the key control factors of the reservoir fracturing. On this basis, the AHP(Analytic Hierarchy Process)is used to establish a comprehensive evaluation method of the reservoir fracturing. The research results show that the reservoir has the geo-mechanical potential to form a complex fracture network through fracturing. There are obvious differences in the elasticity, strength parameters, and the in-situ distribution of the tight sandstone formation. The high-stress and strength interlayers between the reservoirs are well developed. Therefore, in the fracturing operation, the fracturing ability of the formation and the optimization of the compressible interval should be considered to avoid the insufficient vertical communication ability of the fracture network by the influence of the interlayer. Based on the brittleness index, fracture toughness index, and horizontal in-situ stress difference index, the fracturing index can effectively determine the best-fractured interval of the reservoir. When the fracturing index is greater than 0.25, the fracturing level of the reservoir is grade I. Therefore, different engineering mechanical parameters should be selected according to the actual conditions of the formation. This research results can provide references and ideas for gas fracturing reconstruction of tight sandstone in the Lower Shihezi Formation.

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备注/Memo

备注/Memo:
基金项目: 国家自然基金联合基金项目“热液作用下的深部含铀油蚀变砂岩地球物理响应及铀油兼探方法”(U2003102)
第一作者: 赵宁,男,1992年生,博士,从事岩石物理实验与复杂储集层测井评价研究。E-mail:zn126000_petrol@126.com
更新日期/Last Update: 1900-01-01