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    Hydrocarbon saturation from total organic carbon logs derived from inelastic and capture nuclear spectroscopy
    2.
    发明授权
    Hydrocarbon saturation from total organic carbon logs derived from inelastic and capture nuclear spectroscopy 有权

    公开(公告)号：US09851468B2

    公开(公告)日：2017-12-26

    申请号：US14433366

    申请日：2013-10-04

    Applicant: Schlumberger Technology Corporation

    Inventor： Michael M. Herron ,  Susan Herron ,  James A. Grau ,  John P. Horkowitz ,  Paul R. Craddock ,  Robert Badry

    IPC: G01V11/00 ,  G01N33/24 ,  E21B49/00 ,  G01V5/10

    CPC classification number: G01V11/00 ,  E21B49/00 ,  G01N33/246 ,  G01V5/101

    Abstract: The accurate determination of formation hydrocarbon or water saturation is a useful step in the petrophysical evaluation of petroleum reservoirs. This disclosure presents a new method for estimating hydrocarbon saturation directly from a porosity log and a total organic carbon (TOC) log. The method is enabled by the recent development of a geochemical spectroscopy logging tool that combines inelastic and capture gamma ray measurements to provide a robust and accurate TOC log. The method differs from the prior approach of using carbon-to-oxygen ratios that is most often applied in cased hole evaluation. The main advantages of this method are that it does not use knowledge of formation water resistivity, it does not rely on a resistivity model, it does not use an extensive calibration database, and it is largely independent of clay or other lithology effects. Here, the principles of the method and the main challenges are described, and calculations that explore uncertainties in the saturation estimates arising from uncertainties in the log inputs are presented. The statistical uncertainty in the estimate of hydrocarbon saturation is as good as 10 saturation units (s.u.) in conventional reservoirs with porosities of 15 porosity units (p.u.) or greater. The method has been applied to the determination of hydrocarbon saturation in a variety of formations, including bitumen-filled dolomite, heavy oil sand, and shaly-sands with both open hole and cased hole wells. The method works equally well in formations drilled and logged with either oil- and water-based mud. The saturation estimates have been benchmarked against a combination of conventional and new logging approaches (e.g., resistivity, magnetic resonance and dielectric logs) and core measurements, with generally excellent agreement among independent determinations. Hydrocarbon saturations can be determined accurately using the method in a number of formation types where conventional methods and models for estimating fluid saturation commonly fail, such as freshwater and unknown water salinity in formations under enhanced oil recovery. The case studies included herein demonstrate that a TOC log derived from geochemical spectroscopy logs can be used to obtain reliable estimates of hydrocarbon saturation in a wide range of environmental conditions and formations.

    Correction to Determined Formation Sulfur to Account for Sulfur in the Wellbore
    5.
    发明申请
    Correction to Determined Formation Sulfur to Account for Sulfur in the Wellbore 审中-公开
    修正确定的硫磺在井筒中考虑硫

    公开(公告)号：US20160047938A1

    公开(公告)日：2016-02-18

    申请号：US14920359

    申请日：2015-10-22

    Applicant: Schlumberger Technology Corporation

    Inventor： James A. Grau ,  David Alan Rose ,  John P. Horkowitz

    IPC: G01V5/10 ,  G01V99/00

    CPC classification number: G01V5/101 ,  G01V99/00

    Abstract: A method for correcting determined sulfur content in formations penetrated by a wellbore for sulfur in the wellbore includes determining an amount of sulfur from spectral analysis of gamma rays detected by a well logging instrument disposed in the wellbore. The gamma rays result from imparting neutrons into the formations. The method includes determining if strontium is present in fluid disposed in the wellbore. An amount of strontium is determined from the spectral analysis. A corrected sulfur content of the formation is determined based on the determined amount of strontium.

    Abstract translation: 用于校正在井筒中用于硫的孔眼穿透的地层中确定的硫含量的方法包括通过由设置在井筒中的测井仪器检测的γ射线的光谱分析来确定硫的量。 伽马射线是由中子赋予地层造成的。 该方法包括确定在井眼中布置的流体中是否存在锶。 从光谱分析中确定一定量的锶。 基于确定的锶量确定地层的校正硫含量。

    Hydrocarbon Saturation From Total Organic Carbon Logs Derived From Inelastic And Capture Nuclear Spectroscopy
    6.
    发明申请
    Hydrocarbon Saturation From Total Organic Carbon Logs Derived From Inelastic And Capture Nuclear Spectroscopy 有权

    公开(公告)号：US20150285944A1

    公开(公告)日：2015-10-08

    申请号：US14433366

    申请日：2013-10-04

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Michael M. Herron ,  Susan Herron ,  James A. Grau ,  John P. Horkowitz ,  Paul R. Craddock ,  Robert Badry

    IPC: G01V11/00 ,  E21B49/00 ,  G01V5/10

    CPC classification number: G01V11/00 ,  E21B49/00 ,  G01N33/246 ,  G01V5/101

    Abstract: The accurate determination of formation hydrocarbon or water saturation is a useful step in the petrophysical evaluation of petroleum reservoirs. This disclosure presents a new method for estimating hydrocarbon saturation directly from a porosity log and a total organic carbon (TOC) log. The method is enabled by the recent development of a geochemical spectroscopy logging tool that combines inelastic and capture gamma ray measurements to provide a robust and accurate TOC log. The method differs from the prior approach of using carbon-to-oxygen ratios that is most often applied in cased hole evaluation. The main advantages of this method are that it does not use knowledge of formation water resistivity, it does not rely on a resistivity model, it does not use an extensive calibration database, and it is largely independent of clay or other lithology effects. Here, the principles of the method and the main challenges are described, and calculations that explore uncertainties in the saturation estimates arising from uncertainties in the log inputs are presented. The statistical uncertainty in the estimate of hydrocarbon saturation is as good as 10 saturation units (s.u.) in conventional reservoirs with porosities of 15 porosity units (p.u.) or greater. The method has been applied to the determination of hydrocarbon saturation in a variety of formations, including bitumen-filled dolomite, heavy oil sand, and shaly-sands with both open hole and cased hole wells. The method works equally well in formations drilled and logged with either oil- and water-based mud. The saturation estimates have been benchmarked against a combination of conventional and new logging approaches (e.g., resistivity, magnetic resonance and dielectric logs) and core measurements, with generally excellent agreement among independentdeterminations. Hydrocarbon saturations can be determined accurately using the method in a number of formation types where conventional methods and models for estimating fluid saturation commonly fail, such as freshwater and unknown water salinity in formations under enhanced oil recovery. The case studies included herein demonstrate that a TOC log derived from geochemical spectroscopy logs can be used to obtain reliable estimates of hydrocarbon saturation in a wide range of environmental conditions and formations.

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