摘要
在低渗透率储层注水开发中,准确预测压裂裂缝高度可控制缝高、防止连通水层、改善压裂效果、确保油藏的高产和稳产。分析了裂缝形态及影响因素,认为油层及隔层的最小水平主应力在剖面上的变化直接影响裂缝高度。利用偶极横波测井得到的纵、横波资料,可计算地层弹性参数,代入黄氏模型中,得到水平应力值;利用密度测井和自然伽马测井,可得到地层的孔隙度和泥质含量,由此计算出岩石强度因子和断裂韧度,从而确定裂缝高度。编制软件对×31井进行实际资料处理,并和斯伦贝谢处理结果进行了对比,可以明显看到裂缝延伸方向基本一致,验证了该方法的可行性及准确性。
Correctly forecasting fracture height in hydraulic fracturing exploitation of low permeability reservoir can control the fracture height, improve fracturing effect, ensure the high yield and yield stability of reservoir. After analyzing fracture shape and its influence factor, it is considered that the minimum horizontal main stress changes of oil layer and interlayer affect the fracture height directly. Stratum elasticity factors and horizontal stress can be calculated by compressional wave and shear wave data from dipole shear wave logging. Rock stress intensity factor and fracture toughness can be figured out by stratum porosity and shale content from density logging and nature GR logging. The fracture height is decided by all the factors above. A programmed software is used to process the practical logging data from well ×31, and the processed result is compared with that from Schlumberger company, showing that the fracture extending direction is consistent with Schlumberger result, which prove the feasibility and veracity of this method.
出处
《测井技术》
CAS
CSCD
2008年第5期446-450,共5页
Well Logging Technology
关键词
测井资料
水力压裂
裂缝高度
应力强度
断裂韧度
logging data, hydraulic fracturing, fracture height, stress intensity, fracture toughness
