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纵横波叠后联合反演油气预测方法研究及应用
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摘要
储层地球物理以地震技术,岩石物理等为作为技术手段,对储层的物性、空间展布、流体分布规律等方面进行研究,从而定性或定量地对储层进行描述和评价。目前,以测井、地震联合反演方法技术为核心的地球物理研究手段是有效储层预测的主要途径。而现在的一些地震反演技术如叠前AVO联合反演虽然可以获得纵横波速度比等参数,但是它主要利用了纵波的AVO资料,通过Zeoppritz方程求解出横波信息,带有一定的近似和假设。常规叠后纵横波联合反演一般是先分别反演出纵、横波阻抗,再联系起来进行分析,忽略了他们之间的内在联系。
     事实上,纵波速度与横波速度之间存在线性联系,纵波速度与地质体的密度也存在密切联系。鉴于此,论文采用了纵横波叠后联合反演方法,将这3个重要的岩性参数联系起来,进行同时反演,从而提高了反演的精度和可靠性,使多波多分量资料在预测岩性、识别流体等优势的充分得到发挥。
     具体研究内容分以下几个方面:
     (1)研究了纵横波叠后联合反演的方法。根据Fatti等人的纵波地震记录表达式,以及Steward与Larson的横波地震记录表达式,利用反射系数、纵波阻抗、横波阻抗、密度之间的关系,推导出纵横波叠后联合反演的地震记录表达式。基于实际测井资料,利用共轭梯度法反演求解出纵波阻抗、横波阻抗和密度等重要的岩性参数,在此基础上进一步计算得到纵横波速度比、泊松比等参数。
     (2)研究了纵横波地震资料的匹配问题。PP波与PS波地震资料的匹配处理主要包括:时间匹配、能量匹配和波形匹配三个方面。PP波与PS波剖面的匹配质量是影响叠后纵横波联合反演结果可靠性的关键因素之一。
     (3)在以上研究的基础上,完成了新场地区须家河组须二段储层的纵横波叠后联合反演储层预测研究。综合利用了纵横波联合反演所获得的纵波速度、横波速度、纵波阻抗、横波阻抗、纵横波速度比、泊松比以及密度等重要的岩性、物性参数。研究这些参数的特征,提取相应的岩石物理信息和含油气信息,综合预测有利含气储层的分布。
     本论文的研究找到了实现纵横波叠后联合反演的有效方法,完成了对纵横波层位的井-震联合标定,实现了纵横波地震资料的匹配,同时完成了反演后储层物性参数的综合解释工作,初步形成了适合川西地区深层致密碎屑岩储层预测研究的纵横波叠后反演技术。该研究成果对其他地区类似的致密碎屑岩油气藏的研究具有重要的指导作用。
Reservoir geophysics can be applied to study the physics-characteristic,space disturber,fluid attribute of reservoir by making user of seismic technology, rock-physics ,and other methods. It helps us to identify and evaluate the reservoir qualitatively or quantitatively.At present, logging and seismic joint inversion of geophysical technology as the core of research methods is the main way to predict the effective reservoir. Now some of the seismic inversion techniques such as prestack AVO inversion although it gets the pp-ps wave velocity ratio and other parameters, but the main advantage of the longitudinal wave AVO data, solving the wave equation by Zeoppritz equation, with some approximation and assumptions. Aspect of conventional post-stack inversion is usually the first wave are inverted pp and ps wave impedance, and then linked to the analysis, ignoring the intrinsic connection between them.
     In fact, the P-wave velocity and S-wave velocity linear contact. P-wave velocity and density of the geological body is closely linked. In view of this, the paper will use the vertical and horizontal wave stack inversion method, the lithology of these three important parameters linked to simultaneous inversion,thus improving the accuracy and reliability of the inversion, the final impact of multiwave.Forecast lithology and fluid identification advantages into full playing.
     Specific study is divided into the following aspects:
     (1) Study the vertical and horizontal wave stack at the same time the joint inversion method. Fatti and others under the P-wave seismic record expressions, and Steward and Larson's wave seismic record expressions, using the reflection coefficient, wave impedance, shear impedance and density, the relationship between the vertical and horizontal wave stack is derived after the joint inversion of seismic records expression. Based on the actual logging data, using conjugate gradient method for solving the wave impedance inversion, shear impedance and density of rocks and other important parameters, a basis for further calculated shear wave velocity ratio, Poisson's ratio and other parameters.
     (2) Study the PP wave and PS wave seismic data matching. PP and PS seismic wave data matching processing include: time matching ,the energy matching and waveform matching. PP and PS wave wave profiles match the quality aspect is the impact of post-stack inversion results of the reliability of wave one of the keys.
     (3) On the basis of the above, the completion of a new market areas Xujiahe aspect of reservoir after the joint inversion of wave stack prediction. Utilization of the vertical and horizontal wave obtained by joint inversion of compressional wave velocity, shear wave speed, wave impedance, shear impedance and shear wave velocity ratio, Poisson's ratio and density important lithology, physical parameters. Study the characteristics of these parameters, extract the corresponding petrophysical information and oil and gas information, enabling comprehensive prediction of gas reservoir distribution.
     Finding of this research is to achieve vertical and horizontal wave of post-stack inversion of the effective ways to complete vertical and horizontal wave layer of the well - seismic calibration, vertical and horizontal seismic data to achieve a match, and after the completion of the reservoir property inversion parameters of the integrated interpretation, the initial formation of a deep western Sichuan tight clastic reservoir prediction of vertical and horizontal wave post-stack inversion. The research is similar to other regions of dense clastic reservoirs of important guiding role.
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