基于裂缝精细评价和力学活动性分析的储层改造方案优选及其在博孜区块的应用

doi:10.3969/j.issn.1672-7703.2017.06.006

摘要/Abstract

摘要： 库车前陆盆地裂缝性致密砂岩储层具有超深超高压的特点，通过适当的改造策略，尽可能地激发天然裂缝的潜能是获得经济效益产能的关键。提出在精细储层裂缝评价和测井解释的基础上，进行天然裂缝的力学活动性研究，优选储层改造工艺。通过数值模拟和理论推导，指出除裂缝的倾角倾向以外，天然裂缝的有效性对其在改造中的力学活动性有明显的影响，并给出裂缝的剪切激活压力的计算方法；从钻井液漏失事件、成像测井参数定量分析、岩心分析、R/S变尺度分析等方面进行裂缝有效性的综合评价，提出了适合此类储层裂缝分类标准；根据天然裂缝力学活动性的分析结果，提出了有针对性的改造策略，即对3种不同裂缝发育特征的储层，可以分别优先采用体积酸压、缝网压裂和大规模加砂压裂等不同压裂改造策略。以此方法改良的储层改造方案，在库车西部博孜区块的实际井施工获得了理想效果，改造后产量较邻井提升显著，为该地区近千亿立方米储量的有效动用提供了理论依据和技术支持。

关键词: 一体化方法, 裂缝有效性, 裂缝力学活动性, 压裂策略, 博孜区块

Abstract: The fractured tight sandstone reservoir in the Kuqa foreland basin is ultra-deep with ultra-high pressure. To obtain economic productivity from the reservoir, it is essential to stimulate the potential of natural fractures with appropriate strategy. Based on the fine fracture evaluation and logging interpretation, the mechanical activity of natural fractures is studied, and accordingly the reservoir stimulation treatment is optimized. Through numerical simulation and theoretical analysis, it is found that the effectiveness of natural fractures, in addition to the dip angle and dip direction, has a significant effect on the mechanical activity of fractures during the treatment, and the calculation method of the shear activation pressure of the fracture is given. The effectiveness of fractures is evaluated comprehensively in respect of mud loss events, quantitative analysis of imaging logging parameters, core analysis, R/S scale-variable analysis and so on, and the classification criteria for such reservoir fractures is put forward. According to the analysis on mechanical activity of natural fractures, the customized stimulation strategies are proposed. To be specific, different fracturing strategies, such as volumetric acid fracturing, fracture network fracturing and large-scale sand fracturing, can be employed for three types of reservoirs with different fracture development features. In this way, the reservoir stimulation scheme is improved. The improved scheme has been satisfactorily applied in the Bozi block in the western Kuqa basin. As a result, the actual production is significantly higher compared with adjacent wells. This scheme facilitates theoretically and technically the effective production of nearly 100 billion cubic meters of reserves in the block.

Key words: integration method, fracture effectiveness, mechanical activity, fracturing strategy, Bozhi block

中图分类号:

TE357.1

张杨, 王振兰, 范文同, 郑子君, 李伟, 于银华, 滕起. 基于裂缝精细评价和力学活动性分析的储层改造方案优选及其在博孜区块的应用[J]. 中国石油勘探, 2017, 22(6): 47-58.

Zhang Yang, Wang Zhenlan, Fan Wentong, Zheng Zijun, Li Wei, Yu Yinhua, Teng Qi. Optimization of reservoir stimulation scheme based on fine fracture evaluation and mechanical activity analysis and its application in Bozi block[J]. China Petroleum Exploration, 2017, 22(6): 47-58.

参考文献

[1] 王招明,李勇,谢会文,能源. 库车前陆盆地超深层大油气田形成的地质认识[J]. 中国石油勘探,2016,21(1):37-43. Wang Zhaoming, Li Yong, Xie Huiwen, Neng Yuan. Geological understanding on the formation of large-scale ultradeep oil-gas field in Kuqa foreland basin[J]. China Petroleum Exploration, 2016,21(1):37-43.
[2] 梁顺军, 梁霄, 杨晓, 程绪太, 卢波, 吴育林,等. 地震勘探技术发展在库车前陆盆地潜伏背斜气田群发现中的实践与意义[J]. 中国石油勘探,2016,21(6):98-109. Liang Shunjun, Liang Xiao, Yang Xiao, Cheng Xutai, Lu Bo, Wu Yulin, et al. Development of seismic exploration technologies and its significance for the discovery of gas field clusters in the buried anticlines, Kuqa foreland basin[J]. China Petroleum Exploration, 2016,21(6):98-109.
[3] 田东江,郜国喜,牛新年,刘永林,李英君. 库车坳陷克深地区低孔裂缝性气藏储层改造产能评价研究[J]. 油气藏评价与开发, 2013,3(2):57-61. Tian Dongjiang, Gao Guoxi, Niu Xinnian, Liu Yonglin, Li Yingjun. Productivity evaluation research of reservoir reconstruction for fractured gas reservoirs in Keshen area of Kuqa sag[J]. Reservoir Evaluation & Development, 2013, 3(2):57-61.
[4] 杨向同,郑子君,张杨,于银华,冯觉勇,王振兰,等. 地质工程一体化在应力敏感型致密储层产能预测中的应用——以库车西部某区块为例[J]. 中国石油勘探,2017,22(1):61-74. Yang Xiangtong, Zheng Zijun, Zhang Yang, Yu Yinhua, Feng Jueyong, Wang Zhenlan, et al. Application of geologyengineering integration in productivity prediction for stresssensitive tight reservoir:a case study of×block in western Kuqa[J]. China Petroleum Exploration, 2017,22(1):61-74.
[5] 邓少贵,李志强. 裂缝性储层裂缝的阵列侧向测井响应数值模拟[J]. 地球科学,2009,34(5):841-847. Deng Shaogui, Li Zhiqiang. The fracture's numerical simulation of array lateral well logging response of fractured reservoir[J]. Earth Science, 2009,34(5):841-847.
[6] 李建良,葛祥,张筠. 成像测井新技术在川西须二段储层评价中的应用[J]. 天然气工业,2006,26(7):49-51. Li Jianliang, Ge Xiang, Zhang Jun. Application of new imaging logging technique in evaluation of Xu two section reservoir in western Sichuan[J]. Natural Gas Industry, 2006,26(7):49-51.
[7] Bounoua N, Dozier G C, Montaggioni P J, Etchecopar A. Applied natural fracture characterization using combination of imagery and transient information:case studies from CambroOrdovician tight sandstones of Algeria[C]//SPE North Africa Technical Conference & Exhibition. Society of Petroleum Engineers, 2008.
[8] 张惠良,张荣虎,杨海军,寿建峰,王俊鹏,刘春,等. 超深层裂缝-孔隙型致密砂岩储集层表征与评价——以库车前陆盆地克拉苏构造带白垩系巴什基奇克组为例[J]. 石油勘探与开发,2014,41(2):158-167. Zhang Huiliang, Zhang Ronghu, Yang Haijun, Shou Jianfeng, Wang Junpeng, Liu Chun, et al. Characterization and evaluation of ultra deep fractured pore tight sandstone reservoirs:a case study of Bashijiqike Formation in Cretaceous, Kelasu structural belt, Kuche foreland Basin[J]. Petroleum Exploration and Development, 2014,41(2):158-167.
[9] 任康绪,肖中尧,曹少芳,袁文芳,张荣虎,马志远. 库车坳陷致密裂缝孔隙型砂岩储层评价的物性界限探讨[J]. 地球科学前沿, 2012,2(4):187-192. Ren Kangxu, Xiao Zhongyao, Cao Shaofang, Yuan Wenfang, Zhang Ronghu, Ma Zhiyuan. Discussion on evaluation scheme of physical property boundary for tight fractured porous sandstone reservoirs in Kuqa depression[J]. Frontiers of Earth Science, 2012,2(4):187-192.
[10] 李佳阳,夏宁,秦启荣. 成像测井评价致密碎屑岩储层的裂缝与含气性[J]. 测井技术,2007,31(1):17-20. Li Jiayang, Xia Ning, Qin Qirong. Evaluation of fracture and gas bearing in tight clastic reservoirs by imaging logging[J]. Well Logging Technology, 2007,31(1):17-20.
[11] 刘金华,杨少春. 油气储层裂缝形成、分布及有效性研究[D]. 青岛:中国石油大学(华东),2009. Liu Jinhua, Yang Shaochun. Formation, distribution and validity of fractures in oil and gas reservoirs[D]. Qingdao:China University of Petroleum (East China), 2009.
[12] 屈海洲,张福祥,王振宇,杨向同,刘洪涛,巴旦,等,基于岩心-电成像测井的裂缝定量表征方法——以库车坳陷KS2区块白垩系巴什基奇克组砂岩为例[J]. 石油勘探与开发,2016,43(3):425-432. Qu Haizhou, Zhang Fuxiang, Wang Zhenyu, Yang Xiangtong, Liu Hongtao, Ba Dan, et al. The fracture quantitative characterization method based on the core-electric imaging logging in Kuche depression KS2 block of Cretaceous Bashijiqike sandstone as an example[J]. Petroleum Exploration and Development, 2016,43(3):425-432.
[13] 信毅,杨帆,陈伟中,章成广. 利用声电成像评价致密砂岩储层裂缝的有效性[J]. 工程地球物理学报,2012,9(3):253-257. Xin Yi, Yang Fan, Chen Weizhong, Zhang Chengguang. Evaluation of fractures in tight sandstone reservoirs by using acoustic electric imaging[J]. Chinese Journal of Engineering Geophysics, 2012,9(3):253-257.
[14] 孙加华,肖洪伟,幺忠文. 声电成像测井技术在储层裂缝识别中的应用[J]. 大庆石油地质与开发,2006,25(3):100-102. Sun Jiahua, Xiao Hongwei, Yao Zhongwen. Application of acoustic-electric imaging logging technique in fracture identification[J]. Petroleum Geology & Oilfield Development in Daqing, 2006,25(3):100-102.
[15] 柳智利,秦启荣,王志萍. 川西DY构造须家河组致密砂岩储层裂缝有效性分析[J]. 重庆科技学院学报:自然科学版,2010,12(5):38-41. Liu Zhili, Qin Qirong, Wang Zhiping. Fracture effectiveness analysis of tight sandstone reservoirs in Xujiahe Formation, DY structure, western Sichuan[J]. Journal of Chongqing University of Science and Technology:Natural Science Edition, 2010,12(5):38-41.
[16] Cheng W, Jin Y, Chen M. Reactivation mechanism of natural fractures by hydraulic fracturing in naturally fractured shale reservoirs[J]. Journal of Natural Gas Science & Engineering, 2015,23(2):431-439.
[17] 金衍,张旭东,陈勉. 天然裂缝地层中垂直井水力裂缝起裂压力模型研究[J]. 石油学报,2005,26(6):113-114. Jin Yan, Zhang Xudong, Chen Mian. Study on hydraulic fracturing initiation pressure model of vertical wells in natural fractured formation[J]. Acta Petrolei Sinica, 2005,26(6):113-114.
[18] 赵金洲,杨海,李勇明,王刚,伍洲. 水力裂缝逼近时天然裂缝稳定性分析[J]. 天然气地球科学,2014,25(3):402-408. Zhao Jinzhou, Yang Hai, Li Yongming, Wang Gang, Wu Zhou. Stability analysis of natural fractures in hydraulic fracture approximation[J]. Natural Gas Geoscience, 2014, 25(3):402-408.
[19] Busetti S. Determination of hydraulically activated fractures and field stress tensors in the Barnett shale using microseismic events data[C]. AGU Fall Meeting Abstracts, 2012.
[20] 仲冠宇,王瑞和,周卫东, 杨焕强. 人工裂缝逼近条件下天然裂缝破坏特征分析[J]. 岩土力学,2016,37(1):247-255. Zhong Guanyu, Wang Ruihe, Zhou Weidong, Yang Huanqiang. Analysis of characteristics of natural fractures under artificial fracture approximation[J]. Rock and Soil Mechanics, 2016,37(1):247-255.
[21] Behnia M, Goshtasbi K, Marji M F, Golshani A. Numerical simulation of interaction between hydraulic and natural fractures in discontinuous media[J]. Acta Geotechnica, 2014, 10(4):533-546.
[22] Dyke C G, Bailin Wu, Milton-Tayler D. Advances in characterising natural fracture permeability from mud log data[J]. SPE Formation Evaluation, 1995,10(3):160-166.
[23] Luthi S M, Souhaite P. Fracture Apertures from electrical borehole scans[J]. Geophysics, 1990,55(7):821-833.
[24] Fuxiang Zhang, Yongjie Huang, Xiangtong Yang, Kaibin Qiu, Xuefang Yuan, Fang Luo, et al. Natural productivity analysis and well stimulation strategy optimization for the naturally fractured Keshen reservoir[C]. SPE Oil & Gas India Conference and Exhibition,2015.
[25] Barton N. Shear strength criteria for rock, rock joints, rock fill and rock masses:problems and some solutions[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2013,5(4):249-261.
[26] 逄仁德,崔莎莎,尹宝福,侯云翌. 鄂尔多斯盆地陆相页岩气缝网压裂技术应用分析[J]. 中国石油勘探,2015,20(6):66-71. Pang Rende, Cui Shasha, Yin Baofu,Hou Yunyi. Network fracturing and its application to continental shale gas in Ordos Basin[J]. China Petroleum Exploration, 2015,20(6):66-71.