Title page for ETD etd-07032005-090208


Type of Document Dissertation
Author Tang, Hong
URN etd-07032005-090208
Title Geostatistical Integration of Geophysical, Well Bore and Outcrop Data for Flow Modeling of a Deltaic Reservoir Analogue
Degree Doctor of Philosophy (Ph.D.)
Department Petroleum Engineering
Advisory Committee
Advisor Name Title
Christopher White Committee Chair
Anuj Gupta Committee Member
Frank T-C. Tsai Committee Member
Julius Langlinais Committee Member
John Wrenn Dean's Representative
Keywords
  • data integration
  • flow modeling
  • experimental design
  • upscaling
  • sensitivity analysis
  • Bayes method
  • truncated Gaussian Bayesian simulation
  • analysis of variance
  • cretaceous frontier formation
  • deltaic reservoir analogue
  • calcite concretion
  • reservoir characterization
  • ground penetration radar
  • geostatistics
Date of Defense 2005-05-06
Availability unrestricted
Abstract
Significant world oil and gas reserves occur in deltaic reservoirs. Characterization of deltaic reservoirs requires understanding sedimentary and diagenetic heterogeneity at the submeter scale in three dimensions. However, deltaic facies architecture is complex and poorly understood. Moreover, precipitation of extensive calcite cement during diagenesis can modify the depositional permeability of sandstone reservoir and affect fluid flow. Heterogeneity contributes to trapping a significant portion of mobile oil in deltaic reservoirs analogous of Cretaceous Frontier Formation, Powder River Basin, Wyoming.

This dissertation focuses on 3D characterization of an ancient deltaic lobe. The Turonian Wall Creek Member in central Wyoming has been selected for the present study, which integrates outcrop digitized image analysis, 2D and 3D interpreted ground penetrating radar surveys, outcrop gamma ray measurements, well logs, permeameter logs and transects, and other data for 3D reservoir characterization and flow modeling. Well log data are used to predict the geological facies using beta-Bayes method and classic multivariate statistic methods, and predictions are compared with the outcrop description. Geostatistical models are constructed for the size, orientation, and shape of the concretions using interpreted GPR, well, and outcrop data. The spatial continuity of concretions is quantified using photomosaic derived variogram analysis.

Relationships among GRP attributes, well data, and outcrop data are investigated, including calcite concretion occurrence and permeability measurements from outcrop. A combination of truncated Gaussian simulation and Bayes rule predicts 3D concretion distributions. Comparisons between 2D flow simulations based on outcrop observations and an ensemble of geostatistical models indicates that the proposed approach can reproduce essential aspects of flow behavior in this system.

Experimental design, analysis of variance, and flow simulations examine the effects of geological variability on breakthrough time, sweep efficiency and upscaled permeability. The proposed geostatistical and statistical methods can improve prediction of flow behavior even if conditioning data are sparse and radar data are noisy. The derived geostatistical models of stratigraphy, facies and diagenesis are appropriate for analogous deltaic reservoirs. Furthermore, the results can guide data acquisition, improve performance prediction, and help to upscale models.

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