Changes

Jump to navigation Jump to search
1,998 bytes added ,  15:37, 21 November 2014
Line 85: Line 85:     
For stratigraphic applications, comparisons to a set of models is also a valid interpretation approach, but in this case, very simple models do not work well. Sedimentary geology is too complex. In fact, hand-drawn models may not be valid at all. It is preferable to use independently verified field examples, such as the one shown in [[:file:dipmeters_fig7.png|Figure 7]]. In this example, the sandy sediments are made up of a sequence of interrupted, truncated, and stacked point [http://geonames.usgs.gov/apex/f?p=136:8:0::::: bars] deposited by meandering stream activity. Few complete fining-upward point bar cycles (gravels to sands to shales) are present. Instead, erosional cuts and festoon cross-bedding indicate the start of a new cycle that may or may not be interrupted before the deposition of low angle planar current bedding. (Additional characteristics of meandering streams are covered in  [[Lithofacies and environmental analysis of clastic depositional systems]].) In the general case, a catalog of field examples of dip plots from various known depositional environments is a valuable aid to stratigraphic dipmeter interpretation.
 
For stratigraphic applications, comparisons to a set of models is also a valid interpretation approach, but in this case, very simple models do not work well. Sedimentary geology is too complex. In fact, hand-drawn models may not be valid at all. It is preferable to use independently verified field examples, such as the one shown in [[:file:dipmeters_fig7.png|Figure 7]]. In this example, the sandy sediments are made up of a sequence of interrupted, truncated, and stacked point [http://geonames.usgs.gov/apex/f?p=136:8:0::::: bars] deposited by meandering stream activity. Few complete fining-upward point bar cycles (gravels to sands to shales) are present. Instead, erosional cuts and festoon cross-bedding indicate the start of a new cycle that may or may not be interrupted before the deposition of low angle planar current bedding. (Additional characteristics of meandering streams are covered in  [[Lithofacies and environmental analysis of clastic depositional systems]].) In the general case, a catalog of field examples of dip plots from various known depositional environments is a valuable aid to stratigraphic dipmeter interpretation.
 +
 +
==Examples of use==
 +
* Schlumberger, 1986, Dipmeter Interpretation Fundamentals: New York, Schlumberger Ltd., 76 p.
 +
* Nurmi, R., D., 1984, Geological evaluation of high resolution dipmeter data: Society of Professional Well Log Analysts' 25th Annual Logging Symposium, vol. 2, paper YY, 24 p.
 +
* Sercombe, W., J., Golob, B., R., Kamel, M., Stewart, J., W., Smith, G., W., Morse, J., D., 1997, Significant structural reinterpretation of the subsalt, giant October field, Gulf of Suez, Egypt, using SCAT, isogon-based section and maps, and 3D seismic: The Leading Edge, vol. 16, p. 1143–1150, DOI: [http://library.seg.org/doi/abs/10.1190/1.1437752 10.1190/1.1437752].
 +
* Hurley, N., F., 1994, [http://archives.datapages.com/data/bulletns/1994-96/data/pg/0078/0008/1150/1173.htm Recognition of faults, unconformities, and sequence boundaries using cumulative dip plots]: AAPG Bulletin, vol. 78, p. 1173–1185.
 +
* Morse, J., D., Bengston, C., A., 1988, What is wrong with tadpole plots?: AAPG Bulletin, vol. 72, p. 390.
 +
* Delhomme, J.-P., Pilenko, T., Cheruvier, E., Cull, R., 1986, Reservoir applications of dipmeter logs: [https://www.onepetro.org/journal-paper/SPE-15485-PA Society of Petroleum Engineers Paper 15485], 7 p.
 +
* Etchecopar, A., Bonnetain, J.-L., 1992, [http://archives.datapages.com/data/bulletns/1992-93/data/pg/0076/0005/0000/0621.htm Cross sections from dipmeter data]: AAPG Bulletin, vol. 76, p. 621–637.
 +
* Bengston, C., A., 1981, [http://archives.datapages.com/data/bulletns/1980-81/data/pg/0065/0002/0300/0312.htm Statistical curvature analysis techniques for structural interpretation of dipmeter data]: AAPG Bulletin, vol. 65, p. 312–332.
 +
* Bengston, C., A., 1982, [http://archives.datapages.com/data/specpubs/basinar2/data/a130/a130/0001/0000/0031.htm Structural and stratigraphic uses of dip profiles in petroleum exploration], in Halbouty, M., T., ed., The Deliberate Search for the Subtle Trap: [http://store.aapg.org/detail.aspx?id=375 AAPG Memoir 320], p. 619–632.
    
==See also==
 
==See also==

Navigation menu