The objective is to empower the reader and scientific community with the knowledge and specific applicable equations to then reproduce the critical rock and fluid attributes in the Powder River Basin. To then continue...The objective is to empower the reader and scientific community with the knowledge and specific applicable equations to then reproduce the critical rock and fluid attributes in the Powder River Basin. To then continue to unravel the basin and its potential (both conventionally and unconventionally). The overall goal is to ensure the transfer of knowledge and </span><span style="font-family:Verdana;">communication of a petrophysical workflow that can then also influence application to </span><span style="font-family:Verdana;">other basins worldwide. </span><span style="font-family:Verdana;">The Powder River Basin is in southeast Montana and northeast Wyoming and is a prolific oil and gas (hydrocarbon-prone) sedimentary basin related to the greater </span><span style="font-family:Verdana;">Rockies chain/series of hydrocarbon-bearing basins (ex. Big Horn, Greater Green River, </span><span style="font-family:Verdana;">Denver-Jules). In this study, we briefly set-up the geological background of the Powder River Basin and the importance/ relevance to then tackling subsurface petrophysical evaluation on a regional scale. Approximately, 200 wells were evaluated petrophysically by a combined deterministic and inversion-based workflow representing an effort to share best practices, ap</span><span style="font-family:Verdana;">proaches, and the relative trends to apply in the basin to unravel the stratigraphic hydrocarbon potential in place. An extensive workflow involving basic petrophysical approaches such as raw log applicable cutoffs and volume of clay determination are shared as well as extending </span><span style="font-family:Verdana;">knowledge and application into advanced petrophysics through geochemical property derivation and impact of those derived properties as well as bound versus free water and hydrocar</span><span style="font-family:Verdana;">bon understanding. Results of the petrophysical analysis highlight the varying properties in conventional and unconventional formations (example Niobrara). The results of how and why the petrophysical approach was calibrated and then applied are the primary efforts ac</span><span style="font-family:Verdana;">complished.展开更多
One of the most common subsurface data sets that is easily accessible and often underutilized is the acquired measuring while drilling (MWD) gamma ray (GR-GAPI) log. Data is acquired from a given gamma ray tool positi...One of the most common subsurface data sets that is easily accessible and often underutilized is the acquired measuring while drilling (MWD) gamma ray (GR-GAPI) log. Data is acquired from a given gamma ray tool positioned within the drill string and pulsed up to the surface through the mud column in the wellbore. Typical use of the data is for subsurface geologists, drillers and others to correlate the data to known stratigraphic signatures and steer wells through horizontal target zones. Through that correlation, an association to the geologic stratigraphic column can be made and the team of subsurface scientists adjusts where, how fast, and why they choose to continue drilling. The technique of correlation applies to both the conventional and unconventional application. In the unconventional ap</span><span style="font-family:Tahoma;font-size:12px;">plication, the data is also typically acquired along the length of the horizontal wellbore. From</span><span style="font-family:Tahoma;font-size:12px;"> a petrophysical standpoint, just acquiring a gamma ray can limit the amount of information </span><span style="font-family:Tahoma;font-size:12px;">and ability to fully evaluate the properties along the length of the well. In this study, we share</span><span style="font-family:Tahoma;font-size:12px;"> and demonstrate how to utilize the MWD GR for petrophysical evaluation beyond just a volume of shale or volume of clay interpretation. The workflow will allow full integration of a comprehensive petrophysical evaluation that can then be utilized to support all subsurface understandings and modelling efforts.展开更多
文摘The objective is to empower the reader and scientific community with the knowledge and specific applicable equations to then reproduce the critical rock and fluid attributes in the Powder River Basin. To then continue to unravel the basin and its potential (both conventionally and unconventionally). The overall goal is to ensure the transfer of knowledge and </span><span style="font-family:Verdana;">communication of a petrophysical workflow that can then also influence application to </span><span style="font-family:Verdana;">other basins worldwide. </span><span style="font-family:Verdana;">The Powder River Basin is in southeast Montana and northeast Wyoming and is a prolific oil and gas (hydrocarbon-prone) sedimentary basin related to the greater </span><span style="font-family:Verdana;">Rockies chain/series of hydrocarbon-bearing basins (ex. Big Horn, Greater Green River, </span><span style="font-family:Verdana;">Denver-Jules). In this study, we briefly set-up the geological background of the Powder River Basin and the importance/ relevance to then tackling subsurface petrophysical evaluation on a regional scale. Approximately, 200 wells were evaluated petrophysically by a combined deterministic and inversion-based workflow representing an effort to share best practices, ap</span><span style="font-family:Verdana;">proaches, and the relative trends to apply in the basin to unravel the stratigraphic hydrocarbon potential in place. An extensive workflow involving basic petrophysical approaches such as raw log applicable cutoffs and volume of clay determination are shared as well as extending </span><span style="font-family:Verdana;">knowledge and application into advanced petrophysics through geochemical property derivation and impact of those derived properties as well as bound versus free water and hydrocar</span><span style="font-family:Verdana;">bon understanding. Results of the petrophysical analysis highlight the varying properties in conventional and unconventional formations (example Niobrara). The results of how and why the petrophysical approach was calibrated and then applied are the primary efforts ac</span><span style="font-family:Verdana;">complished.
文摘One of the most common subsurface data sets that is easily accessible and often underutilized is the acquired measuring while drilling (MWD) gamma ray (GR-GAPI) log. Data is acquired from a given gamma ray tool positioned within the drill string and pulsed up to the surface through the mud column in the wellbore. Typical use of the data is for subsurface geologists, drillers and others to correlate the data to known stratigraphic signatures and steer wells through horizontal target zones. Through that correlation, an association to the geologic stratigraphic column can be made and the team of subsurface scientists adjusts where, how fast, and why they choose to continue drilling. The technique of correlation applies to both the conventional and unconventional application. In the unconventional ap</span><span style="font-family:Tahoma;font-size:12px;">plication, the data is also typically acquired along the length of the horizontal wellbore. From</span><span style="font-family:Tahoma;font-size:12px;"> a petrophysical standpoint, just acquiring a gamma ray can limit the amount of information </span><span style="font-family:Tahoma;font-size:12px;">and ability to fully evaluate the properties along the length of the well. In this study, we share</span><span style="font-family:Tahoma;font-size:12px;"> and demonstrate how to utilize the MWD GR for petrophysical evaluation beyond just a volume of shale or volume of clay interpretation. The workflow will allow full integration of a comprehensive petrophysical evaluation that can then be utilized to support all subsurface understandings and modelling efforts.
