含气储层非均质性评价技术研究及其应用

Research on evaluation technology of gas-bearing reservoir anistropy and its application.

D气田为构造-岩性油气藏,主力气层为海相临滨砂坝和临滨滩砂,储集层非均质性严重,主要表现为平面上的冲沟和储层内部厚度较薄的隔夹层。在现有的地震资料分辨率条件下,利用常规的地球物理手段很难对冲沟和隔夹层的分布进行精确描述。为此,首先对D气田的地质构造进行了分析,并在此基础上探讨了现有储层预测技术系列存在的弊端;然后提出了一套针对冲沟和隔夹层的地球物理评价体系,包括岩石物理学、提高地震分辨率处理、有色反演、时频三原色和属性投影等方法技术。实际应用效果表明,该套评价体系适合于非均质性较强地区的储层预测,储层预测结果与钻井结果一致。

D gas field is a structural-lithological reservoir.The main gas formation is marine shoreface sandstone dam and shoreface beach sand.The reservoir has serious anisotropy.This mainly shows the coombe on the surface and the thin interlayer in reservoir.The res- olution of the present seismic data cannot precisely describe the dis- tribution of the coombe and the interlayer with conventional geo- physical methods.Firstly,the geologic structure of the whole gas field was analyzed.On the basis,the abuse of existing reservoir prediction technology was probed.Then,a geophysical evaluation system aiming at coombe and interlayer was proposed,including petrophysics,resolution enhancement processing,colored inver- sion,time-frequency three primary colors,attributes projecting, etc.The practical application shows that the system is suitable to the area with strong anisotropy. The predicting result coincides with the drilling result.