Flow chart for dipmeter processing decisions upper, interpretation lower for structural analysis. Structural geology and sedimentology from dipmeter data. Designing a test nasas standard since 1989 for analyzing preloaded bolts, nsts08307, was thought by many to be overly penalizing, driving cost and weight unnecessarily, requiring the ultimate margin of. Reliable predictions of the structural configuration in surrounding rock units can be made by extrapolation of proper threedimensional interpretations from. New geologic work on the 26r reservoir started with a reconsideration of the structural geometry of the reservoir. Resistivity tools dipmeter dipmeter interpretation vertical dip variation is characteristic of the structure. Hydrodynamics and abnormal pressure effects transition from fresh water to salt water hydrodynamic effects abnormal pressure effects on well logs. The application of dipmeter data to solving structural problems is covered in evaluating structurally complex reservoirs. Dipmeter logs have been processed in a variety of ways as an aid to understanding the geology of the north and south morecambe gas fields. The use of dipmeter logs in the structural interpretation. Hurst a, griffiths cm, worthington pf eds geological application of wireline logs ii. Structural interpretation of seismic 155 emujakporue, godwin o ngwueke, marcel i. The most common use of dipmeter results is to define the structural dip occuring in the strata cut by the well bore, and to recognize significant changes in structural dip which may represent folds, faults, unconformities, or major depositional trends.
Dipmeter data, borehole image logs and interpretation. It provides a full digital environment for best practice structural modelling to reduce risk and uncertainty in geological models. Structural analysis of palaeozoictriassic complex in tarnawa1 well western outer carpathians based on halliburton sed dipmeter. Structural interpretation of dipmeter log a case study. The key objective of dipmeter and boreholeimage interpretation is to describe structural and stratigraphic features encountered by a wellbore, commonly in the absence of core. Analytical techniques include fold axis analysis, residual dip analysis dip rotation, statistical curvature analysis scat, and synthetic deviation syndev.
Statistical curvature analysis techniques for structural interpretation of dipmeter data. Variations of dip from point to point in the subsurface and variations in the angle of dip as a function of azimuth of dip are related to the bulk curvature of the structural setting. Integration of structural analysis techniques from borehole dipmeter data with 3d seismic data allows reexamination of an interpretation and enhancement of such smallscale features. Plots include dip logs, polar plots, fold axis plots, tangent diagrams, rose plots, stick plots, scat plots, and syndev plots. The dipmeter advisor system a case study in commercial. Analysis, interpretation, and plotting of dipmeter data. Outline basics of borehole image interpretation bedding and structural dip analysis natural fractures stress features 40. Several faults have been identified, cutting well paths, and dipmeter analysis has allowed. Crains petrophysical handbook structural analysis dip. Statistical curvature analysis techniques scat diagrams traditional dipmeter analysis techniques used for structural analysis involve pattern recognition on the dip arrow, or tadpole, plot. Task geoscience structural interpretation methodology free download as powerpoint presentation. Fractures were picked on the image logs and classified into various fracture sets. Stratigraphic dips in well b left track shows gr, middle total dips, rights track shows dips after removal of structural dips of 11 deg.
The move suite provides a platform for integrating and interpreting data, crosssection construction, 3d model building. Dipmeter surveys in petroleum exploration crc press book. Structural analysis of shoveltum using balanced cross. Dipmeter and image log interpretation is based on the assumption that some beds, commonly lowenergy deposits, were deposited horizontally.
Dipmeter data, core data, stratigraphic isochore data and seismic data provide the geologist with several different tools to obtain information on the orientation of bedding. The task of dipmeter interpretation is divided into twelve succesive phases figure 5. Task geoscience structural interpretation methodology. The reservoir rocks afc represented by folded and faulted pontian sandstones. Also discussed are techniques for the selection of typical regression curves which can help in the identification of lithologically similar intervals based on. The dipmeter advisor a dipmeter interpretation workstation. Blb1, blb2, blb3 in fig4 and bld1, bld2, bld3 in fig5. Duration and training method this is a fiveday classroom course which uses a combination of lectures and self contained exercises based on real data sets. Adams jt, ayodele jk, bedford j, kaarssijpestijn ch, watts nl 1992 application of dipmeter data in structural interpretation, niger delta.
Objective the aim of this log is to determine the angle to the horizontal and the azimuth referenced to magnetic north and geographcal north of the dip of the planes cut by the well. Because of this we have taken search angle as 45o and t min minimum bed thickness as 0. The case study presented describes the statistical curvature analysis technique for a structural interpretation of dip sequence data obtained from. Professional interpreting in the real world includes bibliographical references. The dipmeter is unique in that it is the only logging tool that provides information describing conditions outside the borehole. Structural interpretation of dipmeter results in the gullfaks field. The analyses have verified the general structure obtained by seismic interpretation. Structural analysis of the eola robberson field using.
Stratigraphically, dipmeters and borehole images are used to identify paleocurrent directions, bounding surfaces, facies, thin beds, netsand, and secondary porosity. Structural interpretation from logs steep dips unconformities normal faults reverse faulting and overturning structural interpretations from dipmeter data part 5. Structural interpretation welltowell correlation is difficult in deviated wells with sections of steep and varying structural dip. The system applies a set of rules that combines information from previous phases to refine its conclusions about structural features eg. Structural interpretation of dip data successful structural dip interpretation is based on the good knowledge of geometrical and geological character of the structural features and their characteristic. When these data are integrated into a single database, the seismic interpreter can significantly improve the structural control of seismic interpretation by using all of the available information. This book is a result of his practical experience in the dipmeter interpretation which he did. Use of dipmeter and fmi image tools in structural interpretation. Stratigraphic applications 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. Several faults have been identified, cutting well paths, and dipmeter analysis has allowed the. Analyses of 23 km of dipmeter data from 48 wells on the gullfaks field, northern north sea, have helped to constrain and understand the structural geology of the area. Dipmeter surveys in petroleum exploration 1st edition. Associated interpretation workflows offer the high level of detail that is needed to make operational decision and to increase the predictability of subsurface models.
Tops were identified in all available logs that penetrated the. F2, f3, f4, f5, and f6 while the antithetic faults which trend in the northwestsoutheast direction are a1, a2, a3 and a4. Image data help them analyze reservoir properties such as heterogeneity, sedimentary conditions and structural features, including fractures, folds and faults. Structural and stratigraphic reevaluation of the 26r. Integrated use of well data for structural control of. To define the geometrical shape of the reservoir container and the faults that segmented it into subcompartments, scat statistical curvature analysis of dipmeter data and scatconstrained interpretation of 3d seismic data was done. Structural interpretation of dipmeter and image logs is an essential technique to locally calibrate seismic maps and capture gross rock volume uncertainty. The fmi fullbore formation microimager provides microresistivity. Both wells from each field have a measured elog, and one also has a highquality diplog. The system examines the dipmeter data for red and blue patterns in the vicinity of structural features. Dip sequence analysis utilizing statistical curvature. Many exploration and production companies have acquired a wealth of dipmeter and image log data. This indicates the broad direction of paleocurrent in all the wells towards nw.
Application of a modern electrical borehole imager and a new image interpretation technique to evaluate applications of dipmeter and borehole image data in static models the porosity and permeability in carbonate reservoirs. Information required for structural analysis of dipdata. Paper pdf lithology zonation file las and plots bed dip types on plots and in las ascii 39. Interpretation of the dipmeter data in this way assisted with the structural interpretation of this folded and faulted part of the drava depression. Building a valid structural model in a triangle zone. The seismic lines are oriented northeast southwest and extend 3 to 6 km 2 to. A case history from the permian basin, united states. Dipmeter as an exploratory tool a case study figure 4. The use of dipmeter data to constrain the structural geology of the gullfaks field, northern north sea. Getting the picture downhole geologists and petrophysicists use image logs to visualize rocks in situ and determine structural geometry and formation properties. Employ dipmeter and borehole imaging tools and analyse their interpretation patterns to indicate structural and stratigraphic features. Structural analysis of the eola robberson field oklahoma geological survey guidebook 38 343 a n a d a r k o 3 b a s i n. Bed interpretation products stereonet, tadpole, stick, tst, etc.
Structural interpretation using dipmeter and borehole image data. Applications of dipmeter and borehole image data in static. Structural interpretation of dipmeter and image logs is an essential technique to locally calibrate seismic maps and capture. For structural interpretation of dipmeter data, the selection of processing parameters are crucial so that we can obtain high dip angle and large scale dip pattern without finer details. While this approach can be learned with study and practice, there are other approaches that can be applied. The move suite is the most complete structural modelling and analysis toolkit available. The use of dipmeter data to constrain the structural. The system applies a set of rules to identify structural features e.
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