检索结果-南通市图书馆

Probabilistic Fisher discriminant analysis based on Gaussian mixture model for estimating shale oil sweet spots

Frontiers of Earth Science 2022年第3期16卷 557-567页

作者： Kun LUO Zhaoyun ZONG School of Geosciences China University of PetroleumQingdao 266555China

The delineation of shale oil sweet spots is a crucial step in the exploration of shale oil reservoirs.A single attribute such as total organic carbon(TOC)is conventionally used to evaluate the sweet spots of shale oil.This study proposes a probabilistic Fisher discriminant approach for estimating shale oil sweet spots,in which the probabilistic method and Gaussian mixture model are incorporated.Statistical features of shale oil facies are obtained based on the well log interpretation of the samples.Several key parameters of shale oil are projected to data sets with low dimensions in each shale oil facies.Furthermore,the posterior distribution of different shale oil facies is built based on the classification of each shale oil facies.Various key physical parameters of shale oil facies are inversed by the Bayesian method,and important elastic properties are extracted from the elastic impedance inversion(EVA-DSVD method).The method proposed in this paper has been successfully used to delineate the sweet spots of shale oil reservoirs with multiple attributes from the real pre-stack seismic data sets and is validated by the well log data.

关键词： probabilistic Fisher discriminant analysis sweet spots shale-oil facies Bayesian inversion

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Statistical distribution of geomechanical properties and‘sweet spots’identification in part of the upper Bakken

引用

Petroleum Research 2023年第3期8卷 301-308页

作者： Nelson R.K.Tatsipie James J.Sheng Texas Tech University United States

Completions and Reservoir Quality are two key attributes that are used to characterize nonconventional hydrocarbon assets.This is because,for optimum exploitation of these unconventional assets,horizontal wells need to be drilled in“sweet spots”(i.e.,regions where Completions and Reservoir Quality are both superior).One way to quantify these qualities is to use reservoir and geomechanical properties.These properties can be estimated on a location basis from well logs,and then mapped over terrain using geostatistical modeling.This study presents a‘sweet spots’identification workflow based on three performance indexes(Storage Potential Index,Brittleness Index,and Horizontal Stress Index)that can be used to quantify CQ and RQ.The performance indexes are computed from petrophysical property volumes(of Young's Modulus,Bulk Modulus,Shear Modulus,Poisson's Ratio,Minimum Horizontal Stress,Volume of Shale,Total Organic Carbon,Thickness,and Porosity)which are in turn computed from well logs and geostatistical simulation.In the end,the study offers a method to compare the predicted“sweet spots”against available production data via their correlation coefficient.The resulting reasonable formation property maps,the successful identification of‘sweet spots’,and a correlation coefficient of 0.88(between the predicted“sweet spots”and well production data)point to the potential of the proposed effort.

关键词： sweet spots Sequential Gaussian simulation Storage potential index Brittleness index Horizontal stress index

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Application of Pore Evolution and Fracture Development Coupled Models in the Prediction of Reservoir "sweet spots" in Tight Sandstones

引用

Acta Geologica Sinica(English Edition) 2015年第3期89卷 1051-1052页

作者： ZHANG Linyan ZHUO Xizhun MA Licheng CHEN Xiaoshuai SONG Licai ZHOU Xingui Institute of Geomechanics CAGS Department of Geology Liaoning Technical University Oil and Gas Resources Survey of China Geological Survey

The Chang-63 reservoir in the Huaqing area has widely developed tight sandstone ＂thick sand layers, but not reservoirs characterized by rich in oil＂, and it is thus necessary to further study its oil and gas enrichment law. This study builds porosity and fracture development and evolution models in different deposition environments, through core observation, casting thin section, SEM, porosity and permeability analysis, burial history analysis, and ＂four-property-relationships＂ analysis.

关键词： sweet spots in Tight Sandstones Application of Pore Evolution and Fracture Development Coupled Models in the Prediction of Reservoir

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Amplitude-frequency-aware deep fusion network for optimal contact selection on STN-DBS electrodes

引用

Science China(Information Sciences) 2022年第4期65卷 48-63页

作者： Linxia XIAO Caizi LI Yanjiang WANG Weixin SI Hai LIN Doudou ZHANG Xiaodong CAI Pheng-Ann HENG College of Control Science and Engineering China University of Petroleum (East China) Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Department of Neurosurgery Shenzhen Second People's Hospital School of Medicine Shenzhen University Department of Computer Science and Engineering The Chinese University of Hong Kong

Parkinson’s disease(PD) is treated effectively by deep brain stimulation(DBS) of the subthalamic nucleus(STN), using an electrode inserted into the head of a PD patient. The electrode has multiple electrical contacts along its length, so the best may be chosen for selectively stimulating the STN. Neurosurgeons usually determine the optimal stimulated contact via the clinical experience of the neurosurgeon and the motor improvement of PD patients. This is a time-consuming and labor-intensive trial-and-error process. The selection of optimal stimulated contact highly depends on the locations of sweet spots, which are manually identified by the characteristic features of microelectrode recordings(MERs). This paper presents an amplitude-frequency-aware deep fusion network for optimal contact selection on STN-DBS electrodes.The method first obtains the amplitude-frequency fusion features by combining the MERs time sequence features and the amplitude sequence features, and then uses the convolutional neural network(CNN) with convolutional block attention module(CBAM) to identify both the border of the STN and the sweet spots to implant the electrode. The optimal stimulated contact can be selected according to the distribution of the sweet spots. Experimental results indicate that, for successful surgeries, neurosurgeons and the proposed AI solution selected the same optimal contacts. Furthermore, the proposed method outperforms the state-of-the-art methods for STN and sweet spot identification. The proposed method shows great potential for optimal contact selection to improve the efficiency of STN-DBS surgery and reduce the dependence on clinicians’ experience.

关键词： Microelectrode recordings optimal contact selection sweet spots microelectrode recordings Optimal contact selection amplitude-frequency feature Amplitude-frequency feature Deep fusion network deep fusion network

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Restoration of the pre-Jurassic paleogeomorphology and its control on hydrocarbon distribution in western Ordos Basin

Energy Geoscience

引用

Energy Geoscience 2022年第4期3卷 485-494页

作者： Hui Yuan Shuai Yin Li Dong Chengqian Tan School of Earth Science and Engineering Xi'an Shiyou UniversityXi'an710065China SINOPEC Petroleum Exploration and Production Research Institute Beijing100083China

In recent years,the discovery of the Jurassic oil reservoirs in the Western Thrust Belt of the Ordos Basin reveals that the Jurassic formation in this area has huge oil and gas potential.The pre-Jurassic paleo-geomorphology plays a vital role in the formation of the Jurassic oil reservoirs.In this paper,the impression method is applied to restore the pre-Jurassic paleogeomorphology of the Hongde area in the western Ordos Basin,using a large number of drilling,logging,well testing and the latest 3D seismic data.The pre-Jurassic paleogeomorphological units in the study area can be categorized into five groups,including ancient channel valley,ancient terrace,slope,interchannel mound,and low residual mound facies.The oil reservoirs are mainly distributed in highland areas such as slope belts and low residual mounds,the main areas where hydrocarbons accumulate.In addition,the branch ditches in the study area are developed to the southeast and merged into the Ganshan ancient channel.The sandstone in the confluence area of the branch gully is well sorted and connected under frequent scouring by the river.The sand bodies of good connectivity therefore form a drainage system for long-term hydrocarbon migration.The formation of the Jurassic reservoirs in the study area is mainly affected by sedimentary facies,deposition location,and hydrocarbon migration pathway(or fault)of pre-Jurassic paleo-morphology.The results from this study can be useful for the prediction of the Jurassic sweet spots in the western margin of the Ordos Basin.

关键词： Paleogeomorphology Sedimentary facies Hydrocarbon enrichment Jurassic reservoirs sweet spots Ordos basin

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

In-situ Fluid Phase Variation along the Thermal Maturation Gradient in Shale Petroleum Systems and Its Impact on Well Production Performance

引用

Journal of Earth Science 2023年第4期34卷 985-1001页

作者： Qianyou Wang Wei Yang Yaohua Li Zhenxue Jiang Ming Wen Rusi Zuo Xin Wang Zixin Xue Yaohua Wang State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Department of Earth Ocean and Ecological SciencesUniversity of LiverpoolLiverpool L693GPUK Unconventional Oil and Gas Sciences and Technology Institute China University of PetroleumBeijing 102249China Oil and Gas Survey China Geological SurveyBeijing 100083China Now at the Lyell Centre Heriot-Watt UniversityEdinburgh EH144APUK State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China College of Geosciences China University of PetroleumBeijing 102249China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Central South UniversityChangsha 410083China

In-situ fluid phase behavior is important in determining hydrocarbon contents and the multiphase flow through shale reservoirs.The gas-to-oil ratio(GOR) has been recognized as a critical indicator of fluid types.However,little is known about the impact of fluid phase variation across the thermal maturity on shale oil/gas production(e.g.,estimated ultimate recovery,EUR).According to the specific gravity ratio of oil/gas,the producing GOR was converted and normalized into a mass fraction of gas in total hydrocarbons(MGOR) to compare North American shale oil/gas plays with Chinese shale oil and hybrid gas-condensate plays.A correlation between MGOR,the fluid phases,and production data was established to identify five phase stages of flow.MGORvaries systematically with the different production zones,which shows promise in rapidly indicating the well production performance and high production stages of shale oil/gas plays.The hybrid shale gas condensate index,Tmax,and total gas contents were integrated to present the fluid types and maturity of shale gas-condensates,which indicates fluid phase and production variation across thermal evolution.The results offer a unique perspective on the shale oil reservoir producibility based on the impact of GOR on fluid phases and EUR from the dominant global oil/gas plays.

关键词： shale oil shale gas gas condensate fluid phase thermal maturity sweet spots GOR EUR.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：