基于流体声速的碳酸盐岩地层孔隙压力求取方法

发布时间：2018-03-27 23:37

本文选题：碳酸盐岩　切入点：孔隙压力　出处：《石油钻探技术》2017年03期

【摘要】：碳酸盐岩地层具有非均质性强、孔洞与裂缝发育和岩石骨架刚度较强的特点,以正常压实理论为基础建立的地层孔隙压力求取方法不适用于碳酸盐岩地层,为此,进行了碳酸盐岩地层孔隙压力求取方法的研究。碳酸盐岩岩样声速试验和理论分析发现,不同孔隙压力下的碳酸盐岩纵波速度变化主要是由孔隙流体纵波速度变化引起的。利用小波变换法提取和放大孔隙流体纵波速度小幅波动对岩石纵波速度的影响关系,确定碳酸盐岩地层的异常压力层,并与实测地层孔隙压力数据相结合,建立了碳酸盐岩地层孔隙压力预测模型,形成了基于流体声速的碳酸盐岩地层孔隙压力预测方法。应用实例表明,基于流体声速的碳酸盐岩地层孔隙压力预测方法可以预测碳酸盐岩地层的孔隙压力,误差小于15%,满足工程要求,为碳酸盐岩地层孔隙压力预测提供了一种新方法。
[Abstract]:Carbonate strata are characterized by strong heterogeneity, the development of pores and fractures and the rigidity of rock skeleton. The pore pressure calculation method established on the basis of normal compaction theory is not suitable for carbonate strata. The calculation method of pore pressure in carbonate strata is studied. The acoustic velocity test and theoretical analysis of carbonate rock samples show that, The variation of P-wave velocities in carbonate rocks under different pore pressures is mainly caused by the variation of P-wave velocities of pore fluids. Wavelet transform is used to extract and amplify the relationship between the small wave velocities of P-wave velocities of pore fluids and the P-wave velocities of rocks. The abnormal pressure layer of carbonate formation is determined and combined with the measured pore pressure data, the pore pressure prediction model of carbonate formation is established. The pore pressure prediction method of carbonate formation based on fluid sound velocity is formed. The application example shows that the pore pressure prediction method based on fluid sound velocity can predict pore pressure in carbonate formation. The error is less than 15, which meets the engineering requirements and provides a new method for the prediction of pore pressure in carbonate strata.
【作者单位】：中国石化石油工程技术研究院;宝山钢铁股份有限公司研究院(技术中心);
【基金】：国家科技重大专项“中东富油气区复杂地层井筒关键技术研究”(编号:2011ZX05031-004);“海上油气田关键工程技术”(编号:2016ZX05033-004) 中国石化科技攻关项目“伊朗雅达油田活跃沥青侵害防控钻井技术研究”(编号:P16014)联合资助
【分类号】：TE271

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