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低渗透储层原位条件下应力敏感性评价
引用本文:盛英帅,胡清雄,高辉,师永民,党永潮,邵飞,杜书恒,方媛媛.低渗透储层原位条件下应力敏感性评价[J].北京大学学报(自然科学版),2016,52(6):1025-1033.
作者姓名:盛英帅  胡清雄  高辉  师永民  党永潮  邵飞  杜书恒  方媛媛
作者单位:1. 北京大学地球与空间科学学院, 北京 100871 2. 中国石油天然气股份有限公司新疆油田分公司采气一厂, 克拉玛依 834000 3. 中国石油天然气股份有限公司长庆油田分公司第一采油厂, 延安 727501
基金项目:国家科技重大专项(2016zx05013-005)
摘    要:为探讨围压和孔隙压力对岩石渗透率的影响及岩石渗透率敏感性评价的新方法, 选取松辽盆地3块低渗透储层岩样, 采用岩石伺服三轴实验系统, 分别做常规条件和原位条件下的应力敏感性评价, 得到三方面结果。1) 3块样品的渗透率随围压增大而降低, 随着孔隙压力的增大而增大。2) 原位条件下, 物性越差的样品储层应力敏感性越强。借助扫描电子显微镜和恒速压汞实验, 解释了低渗透储层敏感性差异存在的机理。储层岩石喉道的大小和形态、黏土含量和类型、矿物胶结程度是决定渗透率敏感性差异的原因。3) 塑性矿物含量和类型是决定渗透率敏感性差异的主要因素, 即云母、黏土等塑性矿物含量越高, 致密岩石储层渗透率应力敏感性越强。在实际工作中, 评价岩石渗透率敏感性时一般只考虑围压单因素的影响, 会对评价结果带来较大的人为误差, 而岩样地层所处的孔隙压力等条件对渗透率影响不容忽视。为准确地认识低渗透储层的应力敏感特征, 制定更合理的生产压差, 建议进行岩样渗透率敏感性评价时, 恢复地下原位条件。

关 键 词:原位条件  渗透率  应力敏感  微观结构  
收稿时间:2015-06-09

Evaluation on Stress Sensibility of Low Reservoir in Situ Conditions
SHENG Yingshuai,HU Qingxiong,GAO Hui,SHI Yongmin,DANG Yongchao,SHAO Fei,DU Shuheng,FANG Yuanyuan.Evaluation on Stress Sensibility of Low Reservoir in Situ Conditions[J].Acta Scientiarum Naturalium Universitatis Pekinensis,2016,52(6):1025-1033.
Authors:SHENG Yingshuai  HU Qingxiong  GAO Hui  SHI Yongmin  DANG Yongchao  SHAO Fei  DU Shuheng  FANG Yuanyuan
Institution:1. School of Earth and Space Sciences, Peking University, Beijing 100871
2. The First Gas Production Plant, Xinjiang Oilfield Company, PetroChina, Kelamayi 834000
3. The First Oil Production Plant, Changqing Oilfield Company, PetroChina, Yan’an 727501
Abstract:In order to study the effect of confining press and pore press on permeability, the new method of evaluation on stress sensibility is proposed. Three pieces of low permeable reservoir rock samples in SongliaoBasin are selected. A servo-controlled triaxial rock mechanics test system is employed to investigate the permeability of sandstone samples under conventional conditions and in situ conditions. The results show that: 1) The permeability of three pieces of samples reduce with confining press increasing and pore press reducing. 2) The denser the rock is, the stronger stress sensitivity is, in situ conditions, which explains the mechanism of low permeability reservoir sensitivity differences by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), constant speed mercury injection experiment. What’s more, throat size and shape, plastic mineral content and type contribute to the differences of permeability sensitivity. 3) Mineral content and type of plastic are the major factor of the sensitivity of permeability differences. The stress sensitivity of tight reservoir permeability rock becomes strong with the increasement of mica, clay and other plastic mineral content. In the practical work, evaluation on stress sensitivity of permeability, the effect of confining pressure single factor is mostly considered, butthe effect pore presss would be ignored, which is bound to bring larger human error. So evaluation on stress sensibility in situ conditions is essential, which is significant for further understanding of stress sensitivity of low permeability reservoir characteristics and development.
Keywords:in situ conditions  permeability  stress sensitivity  microscopic structure
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