利用测井资料计算碳酸盐岩三个地层压力

CALCULATING THREE FORMATION PRES SURE OF CARBONATE ROCK USING LOGGING DA TA

针对碳酸盐岩的三个地层压力预测相对较难问题,充分考虑到碳酸盐岩剖面的地层特性,提出了一 套利用测井资料计算碳酸盐岩三个地层压力的方法,并讨论了模型中各个参数的测井求取方法。将该整套方法应 用到川东地区LJZ构造LJ9井等多口井的测井资料精细解释处理中,计算出该井不同井深与不同层位的地层压力, 并与实测地层压力对比,结果表明,该套方法从测井信息中提取碳酸盐岩地层压力是可靠的,且精度较高、实用性 强,其结果能够用于碳酸盐岩地层三个地层压力剖面的建立和钻井液密度的设计。

It is vital to accurately determine three - formation pressure for designing drilling mud density, stabilizing borehole and drilling safely. Presently, the logging data are widely used to calculate three - formation pressure in mud -sand profile. However, the technique is insufficiently perfect . Aiming at the problem that estimating three - formation pore pressure is difficult in carbonate profile, and considering different formation characteristics of carbonate formation, proposed a suit of methods to predict three - formation pressure of the carbonate by using logging data, and discussed the calculating method of every parameters. The methods are applied to LJ9 well etc. that belongs to LJZ structure in East of Sichuan, the formation pressure are calculated in different well depth and horizon. It is compared with actual formation pressure, results show that calculating three - formation pressure of the carbonate is reliable based on these methods. The calculated result can be used for establishing three - formation pressure profile and designing the mud density of carbonate formation.