...R. Allen Dennis ABSTRACT Many problems were encountered during the construction of net oil sand isopach maps from electric logs in Wilmington field, California. These maps were to be used for secondary equity determinations, and required committee agreement on all details. Problems arose...

...William H. Hintze ABSTRACT Isopach maps generally are more difficult to draw than structure contour maps. Many geologists have problems depicting the patterns of faults on such maps; this paper demonstrates proper technique. Expressions of faults are of much greater width on isopach maps than...

... are stored on magnetic tape and retrieved by suitable programs, for the preparation of isopachous and paleogeographic maps. Correlative electric-log markers or formation tops are recorded on punched cards or magnetic tape to allow rapid preparation of structural and isopachous maps using the computer...

... section in the Louisiana and Texas Gulf Coast area are stored on magnetic tape and retrieved by suitable programs, together with related environmental data, for the preparation of isopachous and biofacies maps from which paleogeography may be interpreted. Correlative electric-log markers or formation tops...

... sand by using electric log and core data. Isopach maps are prepared after the addition of fault boundaries. In 1977, under the direction of the participants of the Long Beach Unit, the Department of Oil Properties of the City of Long Beach and the Long Beach Operations staff of the California State...

... on the maps presents many problems of interpretation. In part, interpretation of facies maps depends upon the scale of the map, the magnitude of the stratigraphic interval, the geographic area involved, and the relative rate of change of the facies in the map area. In general, two types of maps are recognized...

.... By computing an isopach between the variable seismic datum and the Canyon Reef reflection and subtracting the isopach map from the datum map, we map Canyon Reef structure. The datum map is extrapolated from the shallow core holes.In the area, near-surface complexities produce seis-mic noise and severe static...

... on isopachous maps. Fault patterns, combinations of isopach and structure data, and isoliths of sands and combinations of sands can be mapped. Truncation, onlap, shale-out, etc., are indicated on printed results and plotted maps to aid interpretation and contouring. © 1964 American Association of Petroleum...

... feet of gas. The result has been to emphasize the importance of isopach maps and sedimentation maps in outlining favorable areas. Contour maps, isopach maps, and sedimentation maps illustrate the problems, and structure sections illustrate some anomalous structures resulting from salt thickness...

... Geological Survey Circulars. A regional cross section was constructed establishing the correlation markers. Data collected were used to divide the Winnipeg into three members: an upper transitional member, the Winnipeg shale, and the basal Winnipeg Sandstone. Isopach maps of the shale and sandstone members...

... to make because of correlation problems. Turbidite deposition probably took place in deep-sea fan environments in most cases, but conventional models for these fans are over-simplified for application in studies of the Gulf Coast Miocene. The Miocene outer continental shelf and slope were...

... in the structural closure formed along the trough’s southeastern hingeline before the directions of depositional dips on the southeastern side were reversed. Up-to-the-coast faulting occurred to trap part of these hydrocarbons before further regional tilting emptied the closures. Isopachous maps of key-bed-bounded...

... been grouped in the Oligocene formation, and the writers have restricted their study to the beds included in the interval below that depth and above the 5,600-foot (principal oil-producing) sand. Isopach and other geologic studies of the several sand and shale zones have presented interesting problems...

... (Zone E) sand. Isopach maps of this stratum display the typical features of degradation and planation common to the erosion cycle of normal rivers in an area being subjected to cyclic rejuvenation. Similar maps of the overlying 5,300-foot (Zone D) shale reflect the effects of the deposition over...

... structure, isopach, and various types of lithofacies, biofacies, and environmental data for map preparation. Card or tape computer output can be printed rapidly on data sheets and then plotted manually on maps, or automatic plotting equipment may be used to print the output directly on base maps. Second...

... on several readily identifiable markers over most of the basin disclose its present structural configuration. However, the structural and depositional history is best revealed by a series of isopachous maps of the Mississippian, stages of the Pennsylvanian, and Lower Permian. Regional downwarping...

...C. B. Branan ABSTRACT Isopachous studies of formation intervals within the Permo-Pennsylvanian systems of the Anadarko basin reveal marked change in depositional strike of the beds, thus indicating a progressive shift in axis of sedimentation in the basin. The purpose of this paper is to direct...

...W. C. Krumbein ABSTRACT Stratigraphic maps, such as structure, isopach, and facies maps, are commonly prepared as contour-type maps from measurement data obtained in wells and outcrops. In recent years geologists have experimented with methods for extracting additional information from these maps...

... of interest. All data may be corrected and fine-tuned by the use of the full screen editor. Contoured surfaces or isopachs are generated from the system’s data base, and may be either displayed on the CRT screen or plotted as a map on appropriate plotter equipment. Automatic background section lines...

... Synercom Technology, Inc., and the Contour Interpolation Package (CIP), from Wild Heerbrugg, were used to define the geology and hydrogeology of the areas. Specifically MIMS and CIP were used to generate multiple structure, isopach, and water-table contour maps and geologic cross sections for the areas...