千米桥潜山碳酸盐岩凝析气藏储层评价方法

千米桥潜山凝析气藏的发现是20世纪末在渤海湾盆地的重大发现。千米桥潜山凝析气藏储层岩性为碳酸盐岩。由于储集空间类型既有基质孔隙型又有裂缝和溶蚀孔隙型,储层的定量评价难度很大。随着成像测井技术(尤其是微电阻率成像测井FMI技术)的研制成功,已经可以对近井壁地质现象进行直观、定量的评价;但受探测深度的限制,该技术不能对距离井壁较远储层的储集类型和储集性能的变化做出有效预测。以对千米桥潜山储层的成功评价为实例,介绍了在系统取心刻度测井的基础上采用将3700常规测井资料与成像测井资料相结合的对岩性进行识别的方法,和将有效孔隙分为(与宏观岩心观察和微观分析化验资料相吻合的)基质孔隙、裂缝孔隙和溶洞孔隙的对储集类型和储集性能进行定量评价的方法。同时还介绍了应用CMR核磁共振测井技术定性判别流体性质的方法。

RESERVOIR EVALUATION MEASURE FOR CONDENSATED GAS RESERVOIR OF CARBONATE ROCKS IN QIANMIQIAO BURIED HILL

Qianmiqiao buried hill condensated gas reservoir is an important discovery at the end of 20th century in Bohai Bay basin. Because the reservoir lithology is carbonate rocks, the pore type includes matrix pore, fractured pore and vug pore, it is hard to make quantitative reservoir evalu- ation. With the development of the imaginery logging technology (particularly the micro-resistance imagery logging FMI), the geological phenomena near well walls can be evaluated quantitatively and directly. Limited by the detection depth it is impossible to make an effective prediction to reserve type and property variety. Taking the successful reservoir evaluation of Qianmiqiao buried hill as a practical example, this paper introduces how to make an accurate lithology recognization and divide the effective pores into matrix ones and fractured and vug ones corresponding to macroscopic core observation and microcosmic laboratory assay data applying 3700 routine logging data integrated with imaginary logging data based on the systematic coring graduation logging. Upon this carry out the quantitative evaluation on reserve type and its capability, at the same time apply NMR logging to judge the fluid quality.