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Alfred Lacazette

Alfred Lacazette
Geothermal Technologies Inc.

B.S., M.S., PhD

About

45
Publications
6,148
Reads
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604
Citations
Introduction
Structural geologist with over 30 years domestic and international experience with operating companies and service companies in exploration, production, and reservoir characterization. Recognized expert in fractured reservoir analysis and the interaction of natural fractures systems with hydraulic fractures. Extensive experience and publication record on geological interpretation of microseismic data. Team-player adept at integrating diverse data sets and coordinating projects. Creative scientist with record of innovative problem solving documented by publications. Key skills: Structural interpretation of seismic data, borehole images, and core. Integrated structural, geophysical, geomechanical, and geochemical studies to understand reservoir plumbing. Outcrop analog studies.
Additional affiliations
November 2017 - present
Ambient Reservoir Monitoring, Inc.
Position
  • Consultant
March 2016 - present
NaturalFractures.com, LLC
Position
  • Consultant
August 2011 - September 2016
Global Geophysical Services, Inc.
Global Geophysical Services, Inc.
Position
  • Consultant
Education
September 1984 - June 1991
Pennsylvania State University
Field of study
  • Geoscience

Publications

Publications (45)
Chapter
Full-text available
The Middle Paleozoic section of the Appalachian Plateau exhibits a mechanical stratigraphy defined by layers that emit seismic energy with unique signatures in response to a strain energy accumulated on time scales associated with local, regional, and plate-scale processes. The Earth is in a state of frictional equilibrium, which means that even sm...
Patent
Disclosed are various embodiments of methods for identifying faults and fractures, and other permeable features, within geologic layers during a drilling operation comprising; recording microseismic data during a drilling operation; recording times and positions of a drill bit in a well bore during the drilling operation; processing microseismic da...
Patent
Full-text available
Disclosed are various embodiments of methods for identifying faults and fractures, and other permeable features, within geologic layers during a drilling operation comprising; recording microseismic data during a drilling operation; recording times and positions of a drill bit in a well bore during the drilling operation; processing microseismic da...
Article
Technology Update Newly developed ambient seismic imaging methods provide valuable information throughout the life cycle of an unconventional field. Methods developed by Global Geophysical Services enable new insights for exploration, development planning, fracture and refracture design, reservoir management, production forecasting, and reserves es...
Conference Paper
Full-text available
using passive seismic data from surface arrays. Until now the only stress information available from passive seismic methods has been derived from the focal mechanism solutions of microearthquakes (MEQs). This method has several weaknesses: • The P and T axes of the solution do not correspond to the maximum and minimum compressive stress axes even...
Conference Paper
This paper demonstrates a technique for extracting complex fracture surfaces in three dimensions from microseismic data recorded during fracturing or ambient quiet times. Cumulative semblance is computed on a three-dimensional grid of the reservoir, using microseismic trace data. The semblance volume has local peaks that coincide approximately with...
Chapter
This chapter provides a concise introduction and overview of passive seismic methods and practical applications of such methods for unconventional oil and gas work. It explains how these methods work, what their applications are, how to understand the methods in use by vendors, and how to interpret the results of passive seismic monitoring of hydra...
Conference Paper
Full-text available
Computing fracture image volumes before the frac treatment, during frac treatment, and during production provides a new approach to managing hydraulic fractured reservoir. Computing the producing volume at regular intervals over time allows for better decisions on the designs of the frac treatments for future wells and for the determination of wher...
Article
Until recently direct imaging of reservoir scale fracture-flow networks has been impossible. High-resolution reflection seismic data provides images of larger fractures, but does not show which fractures are likely to be hydraulically transmissive. To date, reservoir-scale fracture networks have been characterized primarily by indirect methods such...
Conference Paper
Knowledge of faults or fracture zones prior to any drilling offers substantial benefits for all phases of operations from exploration to development planning and hydraulic fracture design. We describe the application of a relatively new passive-seismic method that produces images of seismic activity that result from movements on discrete features s...
Conference Paper
Full-text available
URTeC 1581931 Many unconventional reservoirs contain natural fractures. These fractures may be non-conductive but open preferentially during hydraulic fracturing treatment, or they may be conductive prior to treatment and provide an enlarged tributary drainage volume with different lateral extents than those suggested by conventional models of unco...
Conference Paper
Full-text available
URTeC 1582380 Knowledge of discrete transmissive features such as faults or fracture zones prior to drilling offers substantial benefits for all phases of operations from exploration to development planning and hydraulic fracture design. We describe a new application of a relatively new passive-seismic method. The product is images of seismic activ...
Conference Paper
This work will briefly describe a new seismic imaging method that provides comprehensive assessments of passive seismic activity well beyond traditional microearthquake studies. The method sums cumulative seismic activity over time. We describe the method then illustrate applications with case studies. Data is collected from surface or buried array...
Article
Full-text available
Exploitation of unconventional shale gas reservoirs depends on successful hydraulic fracturing and horizontal drilling. Mineralogy, organic matter content, acoustic anisotropy, and in-situ stress all play an important role for well completion design. As part of a comprehensive site study of the Upper Devonian Huron shale, borehole acoustic and mine...
Article
Full-text available
A comprehensive site study carried out in an Upper Devonian shale gas reservoir at a site in southern West Virginia provided data to test a geomechanical model for stimulation of the Huron formation. Using a model in which natural fractures provide the primary conduits for production and are the major target for stimulation, and in which stimulatio...
Article
A comprehensive site study carried out in an Upper Devonian shale gas reservoir at a site in southern West Virginia provided data to test a geomechanical model for stimulation of the Huron formation. Using a model in which natural fractures provide the primary conduits for production and are the major target for stimulation, and in which stimulatio...
Article
Full-text available
The slip direction and slip sense of a fault constrain the orientation of the stress field that caused the fault to slip. Inversion of such slip data for populations of minor faults to determine ancient stress fields is a well-established technique in structural geology. In the field and in oriented core, the slip direction and slip sense of minor...
Article
Full-text available
Three-dimensional seismic volumes from the central Fort Worth Basin display roughly circular collapse chimneys that extend vertically about 800 m from the Ordovician Ellenburger Formation to the Atokan (middle Pennsylvanian) Caddo Limestone. Collapse chimneys in carbonates may be caused by subaerial karst, hydrothermal, or tectonic extensional proc...
Conference Paper
Full-text available
http://www.searchanddiscovery.com/documents/abstracts/hedberg2004austin/short/lacazette.htm
Article
Full-text available
R. Carmona, Maraven S.A.; J. Graterol, SPE, Maraven S.A.; N. Pina, SPE, Maraven S.A.; O. Suarez, Maraven S.A.; A. Lacazette, Western Atlas Logging Services; E. Frost Jr., Western Atlas Logging Services; G. Gomez, Western Atlas Logging Services; T. Quinn, Western Atlas Logging Services Copyright 1997, Society of Petroleum Engineers, Inc. Abstract T...
Article
Crack-seal veins, millifractures, and joints with rhythmic c-type plume patterns are common examples of cyclic crack propagation in rocks. Although in some cases cyclic propagation could result from periodic external forcing by far-field stress changes or fluid-pressure pulsation, the regularity and rhythmic nature of several types of fractures sug...
Article
Full-text available
A new procedure is presented which shows the frequency per unit distance of joints or other planar geologic features as stereographic plots akin to fabric density diagrams. The program uses normal scanline survey data as input. The resultant diagrams show the frequency of fractures having poles that fall within a fixed angular radius of the orienta...
Conference Paper
Full-text available
Article
Full-text available
Linear elastic fracture mechanics quantitatively relates the driving stress of fracture propagation to the material properties of the fractured solid and may be used to model the decrepitation (fracturing) of fluid inclusions under the influence of internal pressure. Existing experimental data on decrepitation can be explained by the methods of fra...
Article
Full-text available
The Chunky Gal Mountain complex is a mélange consisting of largely metasedimentary matrix and abundant fragments and blocks of different rock types, including metasandstones, plagiogranites, amphibolites, and ultramafites. The mélange, as described here, is situated in the Blue Ridge geologic province of North Carolina. It may be part of a much lar...
Article
Full-text available
Detailed mapping of the Chunky Gal Mafic/Ultramafic Complex of SW North Carolina indicates that the complex is involved in a set of ductile shear zones separating pods of less deformed material. The product is a tectonic mixture of fragments of amphibolites, granites, calc-silicates and ultramafic rocks in the Tallulah Falls Fm. Some inclusions are...

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