Browsing by Author "Xu, Hong"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- ItemOpen AccessDetermination of Reservoir Characteristics Using Geostatistical Analysis(2017) Xu, Hong; Innanen, Kristopher; Russell, Brian; Lines, Laurence; Trad, DanielGeostatistics offers a robust way to estimate the spatial distribution of reservoir properties. Geostatistical methods, such as kriging, cokriging, and sequential simulation have been applied to integrate well-log data and seismic attributes. However, conventional deterministic methods of geostatistics, kriging and cokriging often have difficulty identifying the characteristics of lithologic reservoirs because only one secondary attribute is incorporated. To decrease the uncertainty and improve the definition of the final estimate, two modified techniques, cokriging with multiple secondary attributes and block cokriging with multiple secondary attributes, are implemented. However, these deterministic methods can only provide one predicted result, which has trouble capturing the natural heterogeneity of reservoirs and assessing the uncertainty of the predicted map. To solve this issue, an improved stochastic technique, sequential simulation using multi-variable cokriging, is presented. All these presented techniques are applied to real datasets. Case studies are presented to predict the thickness of the reservoir, total organic carbon, and porosity. The final predicted maps demonstrate that these methods can enhance the lateral resolution. Leave-one-out cross-validation is used to evaluate the construction models, and shows that the uncertainty of the estimate can be reduced due to the use of more seismic attributes than traditionally implemented, while still optimizing cross-validation.
- ItemOpen AccessMOP: mining opinion from customer reviews(2009) Xu, Hong; Barker, Kenneth E.
- ItemOpen AccessTeaching Machine Learning: Student Project Reports for CPSC 599.66 and 601.66 Winter 2007(2007-04-25) Richter, Michael; Bilawshuk, Tyler; Leclerc, Eric; McClocklin, Landon; Lyons, Allan; Kendon, Tyler; Kidney, Jordan; Xu, Hong; MacKas, Brenan; Obied, Ahmed; Olsen, Luke; Park, Justin; Walker, Scott; Olsen, Luke; Park, Justin; Tkachyk, Stephanie; Ma, Lizhe; Kianmehr, KevinTeaching machine learning has two parts. One part is the lectures. These can be found under www.cpsc.ucalgary.ca/~mrichtet/ml. But lecturing is only half of the story. That is, because passive learning by listening does not provide the same expertise compared to active learning by doing. For this purpose a project work was required. Students had the choice to work on their own or to form a group of two. At the beginning of the course, after some introduction and overview, the projects started. The start had the following steps: 1) Selecting a domain of application as, e.g. spam filters, playing games, cooperative multiagents etc. 2) Formulating a learning goal in that domain, as improving cooperation. The choice was completely free. 3) Selecting one or more candidates for learning techniques presented in the course that were focused in the sequel. These topics were presented first very early and then in some more detail at midterm. In this volume the final reports are listed. Particular emphasis was put on the aspects of the difficulties that occurred during the project and how to overcome them. The difficulties had different sources. The major ones are problems with the tools and getting enough data, or underestimating the complexity. The free choice of the application domain had the consequence that the authors were quite familiar with it, could use existing environments and use the results for further activities like masters or PhD theses. Formal projects implementation details are available, write to mrichter@cpsc.ucalgary.ca