成像测井裂缝拾取在直井与相应侧钻井中的应用

Application of Fracture Pickup by Imaging Well Logging Technology in Vertical Well and Corresponding Sidetracking Wells

在风化壳溶蚀缝洞发育的碳酸盐岩地层中,如果钻开直井目的层的裂缝段出水,则对该直井进行侧钻,侧钻井的裂缝段也可能出水,导致侧钻井失误。利用成像测井技术,以塔里木盆地北部奥陶系碳酸盐岩地层所钻直井LGXX井和侧钻井LGXXC井为例,在对直井和侧钻井成像测井资料裂缝拾取的基础上,分析了直井与侧钻井裂缝的产状。研究结果表明,侧钻井LGXXC井与直井LGXX井都钻遇到了同一期次的裂缝系统。该实例为今后在裂缝发育部位的碳酸盐岩储层侧钻井方案的设计提供了借鉴。

In the dissolved fracture-cave reservoirs of the weathered crust of carbonate formation,if water was produced in the target zones of drilled vertical wells,the sidetracking was performed in vertical wells and water was also produced in the fractures of sidetracked wells,it would induce erratic wells.By taking the vertical well LGXX and the sidetracking well LGXXC of the Ordovician carbonate formation in northern Tarim Basin for example,on the basis of fracture pickup of imaging well logging data,the fractured occurrence of the vertical and sidetracked wells was analyzed.The result shows that it encounters with the fracture system of the same period in LGXX and LGXXC drilling.The case provides a reference for the future sidetracking program design for carbonate reservoirs.