Dr. Andrew Joseph Davidoff P.G.

The target for any contractor when reprocessing seismic data is simply to obtain improved resolution and imaging using the latest technologies. This in turn leads to a more accurate interpretation of existing and future hydrocarbon reservoirs in the fields. In this case study we present how incorporating high end processing techniques in conjunction with geological information can help overcome processing challenges presented by the data.

A common problem faced by explorationists in interpreting normal faults from seismic data is identifying the proper location of the fault plane and the impact of fault shadows on potential misinterpretations. In the time domain, normal faults can produce fault shadows. This is apparent even in environments with simple velocity fields. Fault shadows are caused by rapid lateral velocity changes across the fault plane. These lateral velocity variations are not always properly accommodated by time… Show more

A common problem faced by explorationists in interpreting normal faults from seismic data is identifying the proper location of the fault plane and the impact of fault shadows on potential misinterpretations. In the time domain, normal faults can produce fault shadows. This is apparent even in environments with simple velocity fields. Fault shadows are caused by rapid lateral velocity changes across the fault plane. These lateral velocity variations are not always properly accommodated by time processing. The result, commonly referred to as a fault shadow effect, can include a range of artificial time structures and complexities below the fault that can be variously interpreted as additional faults, gas chimneys, or even potential prospects. Both modeled and real data are used to illustrate the potential impact of the fault shadow in time domain processing and the potential of depth domain processing to resolve these issues. Show less

The Jatiluhur Block is located in the southern portion of the West Java Basin and covers Bogor Trough and volcanic centers on the South. The Block is highly prospective but under explored. Perhaps, in the past it was considered as a difficult area to explore, where seismic acquisition was hampered by volcanic cover and rugged topography associated with complicated structures. One of the targets for reservoir in the area is the Batu Raja Limestone. Typically, Batu Raja reservoir quality is best… Show more

The Jatiluhur Block is located in the southern portion of the West Java Basin and covers Bogor Trough and volcanic centers on the South. The Block is highly prospective but under explored. Perhaps, in the past it was considered as a difficult area to explore, where seismic acquisition was hampered by volcanic cover and rugged topography associated with complicated structures. One of the targets for reservoir in the area is the Batu Raja Limestone. Typically, Batu Raja reservoir quality is best in the reefal buildup facies. The most favorable environment for reefs to develop is on basement highs. If this condition occurs at the perimeter of half graben structures, which are common in the Jatiluhur Block, it is ideal for hydrocarbon sourcing and trapping. However, these locations generally have poor seismic imaging due to lateral velocity variation in the overburden. In addition, in the Jatiluhur Block, complicated thrusting also adds lateral velocity variation. Show less

Mid-late Eocene third order sequences in the Brazos River section are composed of transgressive and highstand systems tracts of shelfal marine and shorezone marine sediments. Diagenesis has destroyed most fossils (except palynomorphs, agglutinated forams, and traces), but sedimentary structures and fabric provide evidence for determination of depositional gradient. Tidalite deposits dominate shallower parts of the gradient while proximal and distal storm deposits dominate deeper parts of the… Show more

Mid-late Eocene third order sequences in the Brazos River section are composed of transgressive and highstand systems tracts of shelfal marine and shorezone marine sediments. Diagenesis has destroyed most fossils (except palynomorphs, agglutinated forams, and traces), but sedimentary structures and fabric provide evidence for determination of depositional gradient. Tidalite deposits dominate shallower parts of the gradient while proximal and distal storm deposits dominate deeper parts of the gradient. Show less

Documentation of the geologic history of global sea-level change requires the analysis of numerous, geographically diverse sections. The Paleocene through Eocene section of the Brazos River Valley, eastern Texas, is an area suitable for such analysis which has yet to be studied. Analysis of the Brazos River Valley section for sea-level changes during the Paleocene and Eocene was accomplished by the application of sequence stratigraphie analysis using seismic, well log and outcrop data. The… Show more

Documentation of the geologic history of global sea-level change requires the analysis of numerous, geographically diverse sections. The Paleocene through Eocene section of the Brazos River Valley, eastern Texas, is an area suitable for such analysis which has yet to be studied. Analysis of the Brazos River Valley section for sea-level changes during the Paleocene and Eocene was accomplished by the application of sequence stratigraphie analysis using seismic, well log and outcrop data. The information obtained from this study was then used in evaluating the published sea-level record. Show less

Sequence stratigraphy of the Gulf Coast Paleogene section is best known from sections in Mississippi and Alabama. Paleogene sediments in eastern Texas are significantly different from those to the east in two important respects. First, these rocks were deposited at very high, and rapidly varying sedimentation rates. Second, at the outcrop these rocks commonly include sediments deposited in marginal to non-marine environments. As a result, lithostratigraphic and sequence stratigraphic… Show more

Sequence stratigraphy of the Gulf Coast Paleogene section is best known from sections in Mississippi and Alabama. Paleogene sediments in eastern Texas are significantly different from those to the east in two important respects. First, these rocks were deposited at very high, and rapidly varying sedimentation rates. Second, at the outcrop these rocks commonly include sediments deposited in marginal to non-marine environments. As a result, lithostratigraphic and sequence stratigraphic relationships in eastern Texas are significantly different from those in the eastern Gulf. Show less

A region in central east Texas outlined by a thickened Mesozoic section is described as a new feature, called the Brazos basin. The basin is approximately 120 mi (190 km) long and 50 mi (80 km) wide, extending from Houston and Trinity counties in the northeast to Austin and Fayette counties in the southwest. It is separated from the East Texas basin by the Houston arch, a northeast-southwest trending positive feature located just southeast of the Elkhart-Mt. Enterprise fault zone. The southeast… Show more

A region in central east Texas outlined by a thickened Mesozoic section is described as a new feature, called the Brazos basin. The basin is approximately 120 mi (190 km) long and 50 mi (80 km) wide, extending from Houston and Trinity counties in the northeast to Austin and Fayette counties in the southwest. It is separated from the East Texas basin by the Houston arch, a northeast-southwest trending positive feature located just southeast of the Elkhart-Mt. Enterprise fault zone. The southeast margin of the basin is formed by the Angelina-Grimes terrace, located just north of the Cretaceous shelf edge. Show less