琼东南盆地高压地层声波测井响应特征

Study of acoustic log responses to the overpressure formation in the southeast Qiong basin

Information Engineering College, Chengdu University of Technology, Chengdu 610059, China

以南海油田琼东南盆地ST36井的测井资料为依据, 对高压地层的声波时差测井响应特征进行深入研究。通过等效深度法计算出与测井曲线采样深度对应的地层压力梯度曲线。在此基础上, 对全井段不同岩性的测井曲线和地层压力梯度进行数据分析, 研究了声波时差与地层压力梯度之间的关系, 并结合ST36井的岩石结构研究结果和声波测井原理对取得的数据分析结论作出解释。通过测井资料综合解释, 高压地层声波时差与地层压力梯度之间关系的分析, 阐述了地层压力对储层解释参数的影响。

This paper studies in depth acoustic log responses to overpressure formation on logging data of well ST36 in the southeast Qiong basin, South China Sea oilfield. The formation pressure gradient curve in the same depth of logging is computed by equivalent depth method. On the above basis, data analysis was carried out on logging and formation pressure gradient data for different lithologies to infer the relationship between acoustic transit time and formation pressure gradient. The acquired data are then interpreted in light of principles of acoustic logging and the rock texture in well ST36. The effects of formation pressure on the calculated reservoir parameters are studied through the relations between acoustic transit time and formation pressure gradient.