An intensive magnetic anomaly within the limits of West Siberia Danilov graben-rift indicates magnetic rocks while numerous wells encountered only weakly magnetized Triassic basalts and liparites in the basement cover...An intensive magnetic anomaly within the limits of West Siberia Danilov graben-rift indicates magnetic rocks while numerous wells encountered only weakly magnetized Triassic basalts and liparites in the basement covered by thick loose Jurassic and younger sediments. The wells penetrated only the first tens meters of the basement and could not tell us about the liparites structure at depth where supposedly they may form a big single body and magnetic rocks may be situated deeper. Geological ideas on a graben-rift structure may be proved (or rejected) by a computer modeling of its magnetic properties. For the anomalous geomagnetic field interpretation, a method of volume integral equations taking into account demagnetization effect was employed. To fit a model a trial-and-error procedure was utilized. The results show that 1) at the depth some rocks are magnetized in opposite direction to the present field;2) highly magnetized rocks (magnetic susceptibility 0.06 - 0.1SI) coming up continuously from the bottom of the model and situated under the graben;3) the studied structure is not a graben but the rift because the continental light crust is absent.展开更多
A considerable effort has been made in the literature for quality assurance (QA) and quality checking (QC) of the petrophysical log data for computation of reservoir rock property parameters. Well log data plays an in...A considerable effort has been made in the literature for quality assurance (QA) and quality checking (QC) of the petrophysical log data for computation of reservoir rock property parameters. Well log data plays an integral role in building a rock physics model for quantitative interpretation (QI) work. A poor-quality rock physics model may lead to significant financial and HSSE implications by drilling wells in undesired locations. Historically, a variety of techniques have been used including histograms and cross plots for reviewing the feasibility of petrophysical logs for QI work. However, no attempt has ever been made to introduce a simplified workflow. This paper serves two-fold. It provides a simplified step by step approach for building a petrophysics/rock physics model. A case study has been presented to compare the synthetic seismogram generated from the simplified workflow with the actual seismic trace at well locations. Secondly, the paper shows how a few key cross plots and rock property parameters provide adequate information to validate petrophysical data, distinguish overburden and reservoir sections, and to help identify fluids and saturation trends within the reservoir sands. In the mentioned case study, the robustness of the simplified rock physics model has helped seismic data to successfully distinguish hydrocarbon bearing reservoir sands from non-reservoir shales.展开更多
地质勘察是水利水电工程建设中的基础性工作。传统的地质勘察依赖于纸质材料记录地质信息,导致二维图件的直观性较差且极易丢失空间特征,现场分析过程大量依赖主观经验,内外业工作脱节难以保证编录效率及数据的可靠性。本文基于三维实...地质勘察是水利水电工程建设中的基础性工作。传统的地质勘察依赖于纸质材料记录地质信息,导致二维图件的直观性较差且极易丢失空间特征,现场分析过程大量依赖主观经验,内外业工作脱节难以保证编录效率及数据的可靠性。本文基于三维实景技术、地理信息系统(Geographic Information System,GIS)、机器学习算法、地质建模等技术方法,提出了以多源数据融合、多平台协同与二三维联动、地质智能编录及快速空间解译为核心的水工地质数字化编录与内外业一体化分析方法,并研发了适用于桌面端和移动端的软件平台,包括三个主要模块:①底图模块:基于多源数据而构建融合的三维实景,实现数据的多平台协同及二三维联动,为内外业工作提供参考场景。②编录模块:基于多平台协同和智能识别方法,实现地质点、地质界线和勘探对象的编录。③分析模块:基于空间解译方法,实现空间产状面的推求和三维空间交线推断等。在具体功能上,移动端侧重外业采集,桌面端侧重内业分析,二者相互配合实现内外业工作的无缝衔接。该系统平台已应用于我国西部一座水利水电工程的地质勘察工作中,与传统工作模式进行对比,大幅提高了地质勘察编录与分析的效率和质量,可为其他类似系统提供可借鉴的方法和模式。展开更多
文摘An intensive magnetic anomaly within the limits of West Siberia Danilov graben-rift indicates magnetic rocks while numerous wells encountered only weakly magnetized Triassic basalts and liparites in the basement covered by thick loose Jurassic and younger sediments. The wells penetrated only the first tens meters of the basement and could not tell us about the liparites structure at depth where supposedly they may form a big single body and magnetic rocks may be situated deeper. Geological ideas on a graben-rift structure may be proved (or rejected) by a computer modeling of its magnetic properties. For the anomalous geomagnetic field interpretation, a method of volume integral equations taking into account demagnetization effect was employed. To fit a model a trial-and-error procedure was utilized. The results show that 1) at the depth some rocks are magnetized in opposite direction to the present field;2) highly magnetized rocks (magnetic susceptibility 0.06 - 0.1SI) coming up continuously from the bottom of the model and situated under the graben;3) the studied structure is not a graben but the rift because the continental light crust is absent.
文摘A considerable effort has been made in the literature for quality assurance (QA) and quality checking (QC) of the petrophysical log data for computation of reservoir rock property parameters. Well log data plays an integral role in building a rock physics model for quantitative interpretation (QI) work. A poor-quality rock physics model may lead to significant financial and HSSE implications by drilling wells in undesired locations. Historically, a variety of techniques have been used including histograms and cross plots for reviewing the feasibility of petrophysical logs for QI work. However, no attempt has ever been made to introduce a simplified workflow. This paper serves two-fold. It provides a simplified step by step approach for building a petrophysics/rock physics model. A case study has been presented to compare the synthetic seismogram generated from the simplified workflow with the actual seismic trace at well locations. Secondly, the paper shows how a few key cross plots and rock property parameters provide adequate information to validate petrophysical data, distinguish overburden and reservoir sections, and to help identify fluids and saturation trends within the reservoir sands. In the mentioned case study, the robustness of the simplified rock physics model has helped seismic data to successfully distinguish hydrocarbon bearing reservoir sands from non-reservoir shales.
文摘地质勘察是水利水电工程建设中的基础性工作。传统的地质勘察依赖于纸质材料记录地质信息,导致二维图件的直观性较差且极易丢失空间特征,现场分析过程大量依赖主观经验,内外业工作脱节难以保证编录效率及数据的可靠性。本文基于三维实景技术、地理信息系统(Geographic Information System,GIS)、机器学习算法、地质建模等技术方法,提出了以多源数据融合、多平台协同与二三维联动、地质智能编录及快速空间解译为核心的水工地质数字化编录与内外业一体化分析方法,并研发了适用于桌面端和移动端的软件平台,包括三个主要模块:①底图模块:基于多源数据而构建融合的三维实景,实现数据的多平台协同及二三维联动,为内外业工作提供参考场景。②编录模块:基于多平台协同和智能识别方法,实现地质点、地质界线和勘探对象的编录。③分析模块:基于空间解译方法,实现空间产状面的推求和三维空间交线推断等。在具体功能上,移动端侧重外业采集,桌面端侧重内业分析,二者相互配合实现内外业工作的无缝衔接。该系统平台已应用于我国西部一座水利水电工程的地质勘察工作中,与传统工作模式进行对比,大幅提高了地质勘察编录与分析的效率和质量,可为其他类似系统提供可借鉴的方法和模式。
