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...le:petroleum-systems_fig3-10.png|300px|thumb|{{figure number|4}}Biological marker analysis by Mackenzie et al.<ref name=ch03r6 /> and Hughes et al.<ref name= ...03r6>Mackenzie, A., S., Maxwell, J., R., Coleman, M., L., 1983, Biological marker and isotope studies of North Sea [[crude oil]]s and sediments: Proceedings

...t, W. K., J. M. Moldowan, and R. W. Jones, 1980, Application of biological marker chemistry to petroleum exploration: Proceedings of the 10th World Petroleum Biological marker analysis ([[:file:petroleum-systems_fig3-16.png|Figure 5A]]) from the main

...w the Niobrara. Therefore, although the Mesa Verde provides good [[seismic marker]] beds, the underlying Mancos and Niobrara ...duce. [[Seismic data]] are useful in delineating these faults because good marker beds are usually present below the Niobrara. The fault can then be projecte

...uality-and-performance_fig9-86.png|Figure 2]], structure [[contour]]s on a marker bed above the [[Morrow Sandstone]] reflect the irregular thickness of the s

...e slices. Copyright: a marine 3-D survey and (b) a time-structure map of a marker horizon derived from the 3-D volume of migrated data. (Data courtesy of Wes ...s). The time slices allow the interpreter to generate [[contour]] maps for marker horizons ([[:file:three-dimensional-seismic-method_fig2.png|Figure 2]]). Th

...alysis#Sidewall_core_analysis|sidewall core]], or a significant geological marker. To use this depth in interpreting geological structure, the depth must be * ''m'' = marker depth of interest

...[[cross section]]s that include the key well. Use a region/fieldwide time marker at the top of the reservoir as the datum.

*'''Creating a delete marker'''

...g the study area sequence chart, to the same time scale using the bioevent marker taxa or zonal assemblages. ...tudies have been calibrated to the same time scale using the same bioevent marker taxa and are in turn correlated to the global foraminiferal zones and magne

...oc.org.uk/ks3/gsl/education/resources/rockcycle/page3598.html intrusives], marker horizons

...and K. W. Dunham, 1986, Oil generation in the Michigan basin: a biological marker and carbon isotope approach, in D. Leythaeuser, and J. Rullkötter, eds., A

...t, W. K., J. M. Moldowan, and R. W. Jones, 1979, Application of biological marker chemistry to petroleum exploration, in Proceedings of the Tenth World Petro

...elate between wells that have biostratigraphic-time correlations, well log marker-bed correlations, and the global sea cycle chart.

...fig1.png|300px|thumb|{{figure number|1}}Structure map of the top of the T5 marker, Frlo Formation, Brazoria County, Texas. (After Bebout el al.)<ref name=pt0 ...ow [[Contours|lines of equal elevation or depth]] for a selected [[Markers|marker horizon]] ([[:file:subsurface-maps_fig1.png|Figure 1]]) (see [[Evaluating s

...e trace and the synthetic seismogram. A formation top or other correlation marker on the well log can then be tied to the corresponding seismic horizon with

* Clearly label samples with waterproof marker as to whether they have been “lagged” (i.e., depths corrected for circu

...none, S. C. Brassell, and J. R. Maxwell, 1988a, Geochemical and biological marker assessment of depositional environments using Brazilian offshore oils: Mari

...cal inertness, and abiogenic nature forms a very good indirect geochemical marker.

...lope which is labeled. All labeling should be done with a dark, waterproof marker because nonwaterproof markers will inevitably smudge and streak, and pencil

''G. prisca'' is well known from the Ordovician (and is thus a useful age marker), but the gas chromatographic characteristics of ''G. prisca'' or its desce ...name=ch08r13>Curiale, J. A., D. Cameron, and D. V. Davis, 1985, Biological marker distribution and significance in oils and rocks of the Monterey Formation,

...e amount of fold growth that occurred subsequent to the deposition of that marker. As a result, younger horizons have narrower fold limbs than do older horiz

...pg|{{figure number|1}}Structure map of Yowlumne field drawn on the N-point marker, a regional correlation horizon that marks the approximate top of the Steve

...al sequences. In some basins containing nondescript fill that lacks unique marker beds, like the Gulf of Mexico, high-resolution biostratigraphic correlation

...delta sediments can make correlation difficult otherwise. Other important marker horizons are thin marine shales, impure limestones, and [[coal beds]].

...ed by waves, and black laminated carbonaceous shale, which is an important marker for stratigraphic correlation in the subsurface and a potential generator o

...ures and main bedding planes in the core are traced directly with felt tip marker pens. The unrolled film shows a 360&deg; depiction of the structure compara ...ection, perhaps in conjunction with the absence of a reasonably persistent marker horizon, may be caused by a normal fault cutting out part of the stratigrap

...deposition. Hence with time and continued movements, offsets of individual marker beds increase with depth, and thickness of these beds increases abruptly ac ...ppermost units are generally 5 to 10 m, while at depth (400 m), offsets of marker beds approach 70 to 80 m. Note the increased thickness of the sediment unit

The basic correlation techniques in common use include marker and sequence analysis and, where continuity is very limited, slice techniqu

...ield-Figure26.jpg|{{Figure number|26}}Structure contour of Terry Sandstone marker bentonite bed. Contour interval 100 ft. Map shows Terry (green dots), Hygie

...age becoming greater than vertical well drilling percentage then becomes a marker for converting the U.S Oil and Gas Industry from conventional to unconventi