Geol-4165_Subsurface_Geology-ch3-4_DirDrilling_Correlation

Geol-4165_Subsurface_Geology-ch3-4_DirDrilling_Correlation...

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Unformatted text preview: Click to edit Master subtitle style Geol-4165 Subsurface Geology Chapters 3-4 Instructors: Brown, Nunn, and OSears, 08 This week Feb2-8 • Lecture Monday 2-1-2010 from 8:30-10:30am WebCam Chapter 3 Directionally drilled wells and directional surveys Chapter 4 Log correlation techniques • Labs 2-3/4-09-12:30-3:30 W; 4:40-7:30 Th; Adam&Ting Well Correlation techniques and Seismic Profile integration • Cross section exercise to turn in Week of Feb 13th in labs that week after Mardi Gras break. Not lecture on 13th. Objectives • Wellbore fundamentals of drilling • Wellbore fundamentals of spatial positioning • Wellbore fundamentals of Correlation from one location to another Brown, Nunn, and OSears, 08 The Philosophical Doctrine of Accurate Subsurface Interpretation and Mapping • The object of this class is to give you the basic principles of describing the subsurface with limited remote sensing information • And to introduce you to new computer oriented techniques for visualizing and analyzing this subsurface data. • We will use the 10 key points of (Teapock and Bischke, 2006) philosophy of subsurface interpretation as the bases for this class. Brown, Nunn, and OSears, 08 10 Key Aspects of Accurate Subsurface Interpretation and Mapping 1. All subsurface interpretations must be geologically and geometrically valid in three dimensions. 2. An interpreter must have a fundamental, classic education in geology and a strong background in structural geology for the tectonic setting being worked. 3. Sufficient planning, time and detail are required to generate reliable prospects. Haste makes waste. Brown, Nunn, and OSears, 08 10 Key Aspects-Cont’ 4. All subsurface data must be used to develop a reasonable and accurate subsurface interpretation. 5. Accurate correlations (well log and seismic) are required for reliable geologic interpretations. 6. The use of correct mapping techniques and methods is essential to generate reasonable and correct subsurface interpretations. Brown, Nunn, and OSears, 08 10 Key Aspects-Cont’ 7. All important and relevant geologic surfaces must be mapped and the maps integrated to arrive at a reasonable and accurate subsurface picture. 8. The mapping of multiple horizons is essential to develop reasonably correct, three-dimensional interpretations of complexly faulted areas. Brown, Nunn, and OSears, 08 10 Key Aspects-Cont’ 9. Balanced cross sections are required to prepare a reasonably correct interpretation of complexly deformed structures. 10. ALL WORK SHOULD BE DOCUMENTED. Brown, Nunn, and OSears, 08 Click to edit Master subtitle style Directional Drilling Spatially fit a point into 3D Surfaces and faults Key Stratigraphic Measurement Terms • Isochore- A line connecting points of equal true vertical thickness (@ TVT). Similar to an isopach, but only equivalent when the rock layer is horizontal....
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This note was uploaded on 03/14/2011 for the course GEOL 4165 taught by Professor Alanbrown during the Spring '11 term at LSU.

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Geol-4165_Subsurface_Geology-ch3-4_DirDrilling_Correlation...

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