摘要
针对鄂尔多斯盆地靖边气田上古生界地层特点，建立了一套全新的适合该地层的孔隙压力评价技术。孔隙压力流体评价方法所涉及到的孔覆比和裂缝延伸梯度等参数均为首次定义。该方法数据来源于常规测井的三孔隙度测井及相关测井曲线，利用重点井的地层孔隙压力实验测试结果，结合阵列声波测井，推出了利用地层孔隙压力参数评价储层的新方法。综合应用孔覆比、裂缝延伸梯度和地层孑L隙压力梯度等3个重要的孑L隙压力参数进行地层评价，可明显提高测井解释的符合率。在识别储层含流体性质和确定非储层岩性方面给出了孔隙压力参数具体判识数值。储层含可动流体时，孔覆比变化范围0．40～0．43，裂缝延伸梯度0．027～0．034，地层孔隙压力梯度0．09～0．110。在结合其它解释方法的基础上，孔隙压力参数的流体分析解释方法应用效果更佳。选取了靖边气田18口井的上古生界地层进行了实例效果评价，解释结果与地质实际吻合良好，使其解释符合率大幅度上升，该方法可推广到其他类似低孔隙度低渗透率地层。
This paper describes a set of new effective techniques for pore hydro-pressure evaluation according to the reservoir＇s characteristics in Upper Palaeozoic group of Sulica Gas Field in Ordos Basin. The parameters mentioned are defined for the first time, such as the ratio of pore pressure and upper formation pressure, the fracture extension grads, etc. The data in this method are acquired from the three-porosity-logging and some correlative log data. According to the experimental results of pore pressure of several key wells and combined with cross mutipole array acoustic logging, introduced is a new reservoir evaluation technology using the pore pressure parameters. With these parameters, the log interpretation agreement rate may be improved obviously. The actual pore pressure parameters are worked out for identifying the reservoir with movable fluids and determining non-reservoir lithology. When the reservoir has movable fluids, the ratio of pore pressure and upper formation pressure changes within 0.40 to 0.43; the fracture extension grad is within 0. 027 to 0. 034; and the formation pore pressure grad is within 0.09 to 0. 110. This new technique is used to evaluate and interpret the Upper Palaeozoic groups in 18 wells in Sulica gas-field, the interpreted result from which is in agreement with the geological conclusion, therefore, greatly improving the interpretation precision. This technique can be used in other similar reservoirs with low porosity and low permeability.
出处
《测井技术》
CAS
CSCD
2006年第4期334-337,共4页
Well Logging Technology
关键词
测井解释
孔隙压力
流体性质
流体评价
孔覆比
裂缝延伸梯度
孔隙压力梯度
log interpretation
pore hydro-pressure
fluid property
fluid identification
ratio of pore pressure and upper formation pressure
fracture extension grad
pore pressure grads
