Stratigraphy Software

September 14th, 2009

StrataBugs is the market leader in biostratigraphic data management for both data generators and data users. Now completely re-developed for cross-platform applications, StrataBugs provides the ultimate solution in biostratigraphic data handling. Using StrataBugs you can record, store, manipulate and display biostratigraphic and geological data including wireline logs and graphic lithologies for one or more wells. Import contractors’ data and export traded data to other systems or integrate with other corporate database systems. All applications are supported by on-screen help.

CycloLog is a desktop software package for the display, analysis and graphic output of wireline logs. Although primarily a tool for the application of spectral trend analysis of wireline log data (see Services below), the recently released version 3.2 of CycloLog also enables the petroleum geologist to carry out a wide range of routine and non-routine log analyses, in support of field development and production as well as regional exploration.

Software by Pazsoftware

Counter 4 : Data acquisition software that emulates a manual counter. Speaks category names for audio feedback of counts. Improves data quality and speeds acquisition. Unlimited number of samples and categories. Many spreadsheet-like functions. List view and button view.

WellPlot 4 : Biostratigraphic range charting and analysis software that reads spreadsheet data to create numerous styles of range charts, log charts, or bar charts with multiple columns (up to 600). Calculate percent data for any selected set of taxa. Pick new top/base events with cap lock down+click. Filter data with age-depth events file. Sort by top, base, age, or abundance.

Diversity Calculator 4.5 : Calculate ten common diversity indices and total abundance from spreadsheet data. Mac OS X – Intel & PPC Macs. Version 4.0, below, will run in Classic.

Ternary Plot 5 : Normalize and plot three components on a triangular diagram. Edit data! Plus three bivariate plots, statistics, standard deviation hexagons, projection outside the system, and more… Mac OS X – Intel & PPC Macs.

Lithology Column 2 : Universal Quickly generate outcrop or core descriptions. Create stratigraphic lithology columns from text information. Use age or depth scales. Automatic ‘gamma ray’ logresponse generated from grainsize information. Auto-color and auto-pattern by grainsize!

StratChart 2 : Create multi-column stratigraphic charts from text information. Use age or depth scales. Reads interval name, top and base. Takes the tedium out of creating stratigraphic columns and time charts. Edit and save data.

LogPlot 5 : Plot large e-log data files. Ten curves by 12,000 points. Can be customized for larger files. Comes with LAS-DataSampler. Lightning fast data loading! Interactive curve editing, curve merging, multi-curve lithology interpretation. Environmental borehole corrections! Charts are vector graphics that may be edited and montaged in a graphics application. Mac OSX – Intel & PPC Macs.

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Earthquakes and Faults

September 11th, 2009

An earthquake is the vibration of earth, produced by a rapid release of energy. This energy radiates in all directions from its source, the focus, in the form of waves. The focus of an earthquake is located at depth. The surface location directly above it is called the epicenter.

The tremendous energy released by atomic explosions or by volcanic eruptions can produce an earthquake, but these events are comparatively weak and infrequent. Ample evidence exists that Earth is not a static planet. Scientists have found places where forces have elevated sections of crust and evidence of extensive subsidence.These vertical displacement, offsets in fence lines, roads, and other structures indicate that horizontal movement  associated with large fractures in the earth called faults.

The motion along faults can be explained by plate tectonics theory.Mobile plates interact with neighboring plates, stratining and deforming the rocks at their edges. It is alog faults associated with plate boundaries that most earthquakes occur.

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Understanding of the Jatibarang Formation

September 11th, 2009

The Jatibarang field (North West Java Basin, Indonesia) has drawn much interest to describe its unique behavior as miscellaneous reservoir type. On the otherhand The Jatibarang formation is deemed as dilemma as it always presumed to be product of broad volcanic event succeeding the rifting process in basin.

Sirait (1986) is in the opinion that the deposition of the volcanic has been primarily due to fluvial and sub-aqueous processes in which layering (strata) formation is expected. Elf (1992) has declaring that a sedimentary source from the south is prominent for some of the volcanic. Some hydrothermal alteration as well as sub-aerial weathering is also evident, which is interpreted to be occurred during early deposition of the volcanics.

Elf (1992) is in the opinion that the Jatibarang volcanic is of Eocene to Oligocene age and was deposited following initiation of back arc basin as a result of the Late Cretaceous up to Early Tertiary subduction zone running approximately North East – South West extending from the Meratus zone in East Kalimantan and curving due West to the south of present day of Jatibarang field location (Hamilton, 1979). The volcanic section thickness may attain as thick as 1,200 meters and directly unconformable overlying the metamorphic or igneous pre-Tertiary basement (Soulisa, 1979 in Elf, 1992), yet no wells ever drilled to penetrate the entire volcanic section. Kalan, et.al (1994) concluded that tuffaceous volcanics are the best producing reservoir in the Jatibarang Field, and that productive tuffs can be distinguished on logs. From their results shows that log correlations have isolated two producing tuff layers in the field. The two layers are separated in most field area by a generally non­productive basaltic/andesitic lava layer. Two main log types were defined representing felsic tuff and basaltic/andesitic.

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Batu Hijau

September 11th, 2009

Batu Hijau Porphyry copper gold

The Batu Hijau porphyry copper-gold deposit is situated in southwest Sumbawa Island, Indonesia that it is a world-class deposit of copper and gold, containing mineable reserves of 914 million tonnes grading 0.525 % Cu and 0.403 g/t Au (Clode et al., 1999). The Batu Hijau deposit lies along the tectonically active east-west trending Sunda-Banda magmatic arc. The western part of the Sunda-Banda arc is mostly mineralised by low-sulphidation epithermal systems, e.g. Mangani, Lebong Tandai and Lebok Donok in Sumatra as well as Gunung Pongkor, Cikidang and Cirotan in West Java. The mineralisation style changes to the east (e.g. Central-East Java and Sumbawa Island), which is is marked by discovery of the Porphyry-type at Selogiri area (Central Java) (Imai et al., 2007) and the Batu Hijau porphyry deposit in Sumbawa Island (Maula and Levet, 1996). The southwestern part of Sumbawa Island is underlain by Late Oligocene to Middle Miocene low-K calc-alkaline to weakly alkaline andesitic volcaniclastic rocks, associated with low-K intermediate intrusions and minor shallow marine sedimentary rocks and limestones. The low-K intrusions include porphyritic andesite, hornblende diorite, quartz diorites and tonalite porphyries.

Copper and gold mineralisation is closely related to the emplacement of the tonalite porphyry intrusions. During the emplacement and cooling of the causative tonalite porphyry intrusions, the magmatic hydrothermal fluids are exsolved and interact with the wall rocks, mixing with meteoric waters and form multiple stages of alteration zones. The nature of ore-related fluids is an essential issue in the study of mineral deposits. Three approaches are commonly used to constrain the characteristics of the ore fluids: stable isotopes, fluid inclusions and mineral chemistry. Stable isotope study is mostly employed to determine the source of ore fluids. Mineral chemistry and fluid inclusion are utilised to evaluate the physicochemistry and evolution of the ore-related hydrothermal fluids (e.g. Walshe, 1986; Zhu and Sverjensky, 1992 and Yang and Lentz, 2005).

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