Methodology for assessing original gas in place and estimated ultimate recovery from a tight marine formation using hydraulic fracture stimulation modelling

2017 ◽  
Vol 57 (1) ◽  
pp. 136 ◽  
Author(s):  
Matthew Goldman ◽  
Raymond L. Johnson
Keyword(s):  
United States ◽  
Hydraulic Fracture ◽  
The United States ◽  
Reservoir Rock ◽  
Gas Field ◽  
Stress Regime ◽  
Marcellus Formation ◽  
Half Length ◽  
Estimated Ultimate Recovery ◽  
Hydraulic Fracture Stimulation

Operators in Australia are currently exploring similar geological settings to the tight marine unconventional petroleum systems of the United States, in the hope of emulating the North American success. This study sets out the methodology and models required to undertake an analysis of a tight marine source and reservoir rock to estimate its production potential, with particular attention given to modelling the required hydraulic fracture stimulation. The project target formation is the tight marine Log Creek Formation, which forms the source rock to the overlying proved Gilmore Gas Field in the Adavale Basin in Central Queensland. The Marcellus Formation in the Appalachian Basin in the Northeastern United States is an assumed analogue to the Adavale Basin; data from the Marcellus Formation was used when unavailable for the Adavale Basin. Initially, formation evaluation was undertaken to determine key parameters such as total organic carbon (TOC), mineralogy and stress regime. Once the formation had been characterised, a fracture stimulation model was built to determine the hydraulic fracture stimulation treatment design, which optimised the lateral landing depth, hydraulic fracture spacing, conductivity and half‐length. In particular, it is important to determine the lateral landing depth and fracture half‐length with confidence, as they will define the stimulated reservoir volume (SRV), which sets the upper boundary on original gas in place (OGIP) and estimated ultimate recovery (EUR) of gas. OGIP was estimated using a probabilistic model incorporating an adjustment for absorbed gas volume. Finally, a reservoir simulation was undertaken using a single well composite multi‐fracture model to obtain EUR.

Geomechanic models using finite element methods show how Cooper Basin structure and sand body geometry impacts stress variation and hydraulic fracturing results

2015 ◽  
Vol 55 (2) ◽  
pp. 439
Author(s):  
Nicole Ditty ◽  
Dennis Cooke
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Hydraulic Fracture ◽  
Local Stress ◽  
Three Dimensions ◽  
Stress Regime ◽  
Structural Position ◽  
The Impact ◽  
Cooper Basin ◽  
Hydraulic Fracture Stimulation

Unconventional reservoirs such as tight sands and shales require hydraulic fracture stimulation to improve productivity. The success of reservoir stimulation is controlled by the local stress field but decisions are often made knowing only the average stress field. This study uses geomechanical modelling to help explain lateral stress variability using structural geology, lithology contrast and boundary conditions. Changes in vertical and horizontal stresses are related to depth, lithology and structural position, yet these effects are not always accounted for. This is evident in the Cooper Basin, Australia, where, for example, unexpected changes in minifrac pressure are commonly observed in adjacent wells in a field. This study presents results from conceptual geomechanical models to help explain such variations in stress. Model scenarios are constructed using finite element package to investigate the impact of structural position, rock mechanical properties and stress regime on the patterns of horizontal and vertical stress magnitudes in a layered antiform sequence. Key findings suggest that: stress magnitude is affected by structural positioning; different patterns of stress exist across different lithologies; and, stress regime impacts on patterns of stress, especially in combination with curvature of structures. These challenge traditional methods of one-dimensional mechanical earth models and show that, rather than employing methods developed for simple layer-cake geology in extensional basins, geomechanical models should be constructed in two- or even three-dimensions. Results of this study highlight part of the solution to the unconventional resource potential of the Cooper Basin. Improved prediction of field-scale stress variations should enable further optimisation of hydraulic fracture stimulation treatments.

Correlative microscopy in distrubuted (client/server) computing environments: tools for catalyzing the rapid dissemination of information about the cell biology of the human prostate

1995 ◽  
Vol 53 ◽  
pp. 682-683
Author(s):  
A. Hakam ◽  
J.T. Gau ◽  
M.L. Grove ◽  
B.A. Evans ◽  
M. Shuman ◽  
...  
Keyword(s):  
United States ◽  
Cell Biology ◽  
Tissue Bank ◽  
The United States ◽  
Prostate Adenocarcinoma ◽  
Correlative Microscopy ◽  
Client Server ◽  
Critical Elements ◽  
Transplant Organ

Prostate adenocarcinoma is the most common malignant tumor of men in the United States and is the third leading cause of death in men. Despite attempts at early detection, there will be 244,000 new cases and 44,000 deaths from the disease in the United States in 1995. Therapeutic progress against this disease is hindered by an incomplete understanding of prostate epithelial cell biology, the availability of human tissues for in vitro experimentation, slow dissemination of information between prostate cancer research teams and the increasing pressure to “ stretch” research dollars at the same time staff reductions are occurring.To meet these challenges, we have used the correlative microscopy (CM) and client/server (C/S) computing to increase productivity while decreasing costs. Critical elements of our program are as follows:1) Establishing the Western Pennsylvania Genitourinary (GU) Tissue Bank which includes >100 prostates from patients with prostate adenocarcinoma as well as >20 normal prostates from transplant organ donors.

Digital image acquisition, processing, and analysis in a polymer microscopy laboratory

1994 ◽  
Vol 52 ◽  
pp. 454-455
Author(s):  
Vinod K. Berry ◽  
Xiao Zhang
Keyword(s):  
United States ◽  
Image Analysis ◽  
Digital Image ◽  
Image Acquisition ◽  
Image Transmission ◽  
The United States ◽  
Quantitative Image Analysis ◽  
Quantitative Image

In recent years it became apparent that we needed to improve productivity and efficiency in the Microscopy Laboratories in GE Plastics. It was realized that digital image acquisition, archiving, processing, analysis, and transmission over a network would be the best way to achieve this goal. Also, the capabilities of quantitative image analysis, image transmission etc. available with this approach would help us to increase our efficiency. Although the advantages of digital image acquisition, processing, archiving, etc. have been described and are being practiced in many SEM, laboratories, they have not been generally applied in microscopy laboratories (TEM, Optical, SEM and others) and impact on increased productivity has not been yet exploited as well.In order to attain our objective we have acquired a SEMICAPS imaging workstation for each of the GE Plastic sites in the United States. We have integrated the workstation with the microscopes and their peripherals as shown in Figure 1.

Silence of the Land: On the Historical Irrelevance of Territory to Congressional Districting and Political Representation in the United States

2001 ◽  
Vol 15 (01) ◽  
pp. 53-87 ◽  
Author(s):  
Andrew Rehfeld
Keyword(s):  
United States ◽  
House Of Representatives ◽  
Political Representation ◽  
The United States ◽  
Representative Government ◽  
Congressional District ◽  
Congressional Districts ◽  
Communities Of Interest

Every ten years, the United States “constructs” itself politically. On a decennial basis, U.S. Congressional districts are quite literally drawn, physically constructing political representation in the House of Representatives on the basis of where one lives. Why does the United States do it this way? What justifies domicile as the sole criteria of constituency construction? These are the questions raised in this article. Contrary to many contemporary understandings of representation at the founding, I argue that there were no principled reasons for using domicile as the method of organizing for political representation. Even in 1787, the Congressional district was expected to be far too large to map onto existing communities of interest. Instead, territory should be understood as forming a habit of mind for the founders, even while it was necessary to achieve other democratic aims of representative government.

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