摘要
由于致密砂岩储层低孔低渗,裂缝发育程度是影响其产能的重要因素,评价裂缝对其开发具有重要意义。塔里木克深地区为防止钻井液的污染,大多采用油基钻井液进行钻井,大大增加了对致密砂岩储层中裂缝评价的难度。针对这一问题,从全波列横波信息探讨了声波测井在致密砂岩储层中裂缝评价的方法及应用。考虑岩性、物性的影响,通过阵列声波数据提取出横波衰减系数,然后根据实验得到的衰减系数与裂缝宽度的关系,反演出裂缝宽度,进而反演出裂缝渗透率。同时根据成像资料,得到的裂缝等级与根据孔隙度得到的储层等级建立了与产能的关系。利用该方法得到的裂缝渗透率与成像解释成果图对应良好,并且最终的产能等级整体与试油结论相吻合,表明利用横波信息在致密砂岩裂缝评价中的效果好。
For tight sandstone reservoirs,the degree of crack development is an important factor affecting their productivity due to their low porosity and low permeability.In order to prevent the pollution of drilling fluids in Tarim Keshen area,oil base drilling fluid is always used during drilling,which greatly increases the difficulty of evaluating cracks in tight sandstone reservoirs.Aiming at this problem,the method of acoustic wave logging in the evaluation of fractures in tight sandstone reservoirs was developed from the aspect of full-wavelength shear wave information in sonic data.Considering the influence of lithology and physical properties,the shear wave attenuation coefficient was extracted from the array acoustic data,and then the crack width was inversed according to the relationship between the attenuation coefficient and the crack width obtained by the experiment,and then the crack permeability was inverted.According to the imaging data,the crack grade obtained from the crack parameters and the reservoir grade obtained from the porosity were used to establish an evaluation method that can be well correlated with the productivity.The fracture permeability obtained by this method was in good agreement with the imaging interpretation result map,and the final productivity grade was consistent with the test oil conclusion,showing that the shear wave information was good effect in the evaluation of tight sandstone cracks.
作者
周月明
章成广
蔡明
韩闯
蔡德洋
ZHOU Yue-ming;ZHANG Cheng-guang;CAI Ming;HAN Chuang;CAI De-yang(Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education,Yangtze University,Hubei Wuhan 430100,China;Research Institute of Exploration and Development,PetroChina Tarim Oilfield Company,Xinjiang Korla 841000,China)
出处
《当代化工》
CAS
2019年第12期2844-2847,共4页
Contemporary Chemical Industry
基金
国家自然科学基金,项目号:41774116.
关键词
裂缝评价
阵列声波
横波渗透率
克深地区
Crack evaluation
Array sound wave
Transverse wave permeability
Keshen area
