Two‐dimensional, fenced 2-D, and 3-D isosurface displays of some realistic seismic models built in the lower Miocene Powderhorn Field, Calhoun County, Texas, demonstrate that a event does not necessarily follow an impedance boundary defined by geological time surface. Instead, position filtered relative to surface may vary with frequency because inadequate resolution data en echelon or ramp arrangement anomalies sandstone. Except for relatively time‐parallel events, correlation error picking...

Three‐dimensional seismic data from the Gulf of Mexico Tertiary section show a close dependence events on frequency. While some remain frequency independent, many exhibit different occurrences with changing and, therefore, are not parallel to geologic time surfaces. In set we have studied, observed maximum transgression is at least 120 ms traveltime lower sections. Severe interference in may produce false facies characteristics and obscure true stratigraphic relationships. This phenomenon...

We introduce a seismic-sedimentological approach for mapping high-frequency (fourth-order) sequences and systems tracts using well three-dimensional seismic data. Key techniques include (1) conditioning data to log lithology by 90 phasing better well-log integration (2) imaging interpreting the sequential, planoform geomorphology of depositional systems. recommend new interpretation procedure that shifts emphasis sequence-stratigraphic studies from vertical sections analyzing more...

High-quality three-dimensional seismic data acquired in the central Tabei Uplift, Tarim Basin, western China, provide a rare opportunity to characterize exceptional detail geomorphology of deeply buried (5500–6500 m [18,045–21,325 ft]) Ordovician unconformity and related paleokarst drainage system. An integrated approach was applied that emphasized integration with available conventional core, wireline logs, age-equivalent outcrops. The quality allowed detection limit karstified features...

This study summarizes the research experiences of non-marine seismic sedimentology in recent years China and uses Qijia area, Songliao Basin, as a template to establish general guidelines for sedimentology. Basic data sets include stacked 3D volumes, 2D regional lines, geologic settings, well data. The workflow emphasizes integration interpretations balanced use sedimentology, sequence stratigraphy stratigraphy. steps well-to-seismic tie establishment framework, wavelet-phase adjustment,...

We discuss, in a two-part article, the benefits of 90°-phase wavelets stratigraphic and lithologic interpretation seismically thin beds. In Part 1, seismic models Ricker with selected phases are constructed to assess interpretability composite waveforms increasingly complex geologic settings. Although superior for single surface thick-layer interpretation, zero-phase data not optimal interpreting beds thinner than wavelength because their antisymmetric thin-bed responses tie reflectivity...

We examine field seismic data to test the benefits of 90°-phase wavelets in thin-bed interpretation that are predicted by modeling part 1 this paper. In an interbedded sandstone-shale Miocene succession Gulf Mexico basin, a shift nearly zero-phase significantly improves lithologic and stratigraphic interpretation. A match between acoustic impedance (AI) profiles results better tie amplitude traces lithology-indicative logs. Better geometric imaging AI units does not use dual-polarity events...

At Cranfield, Mississippi, United States, a large‐scale carbon dioxide (CO 2 ) injection through an well (∼3,080 m deep) was continuously monitored using U‐tube samplers in two observation wells located 68 and 112 east of the injector. The Lower Tuscaloosa Formation zone, which consists amalgamated fluvial point‐bar channel‐fill deposits, presents interesting environment for studying fluid flow heterogeneous formations. Continual sampling carried out during first month CO injection. Two...

Anomalous seismic-amplitude bright spots are a common feature in deeply buried (5500 to 6500 m) Ordovician limestone strata the Central Tabei Uplift area of Tarim Basin northwest China. Those anomalies have proven be useful indicators reservoir quality. The as seen on seismic data tied high-gamma ray, low-velocity zones wireline logs, and correspond clastic cave sediment-fills host core. Synthetic models confirm this relationship between cave-sediment fills. A traveltime map top unconformity...

Abstract Paleokarst systems are found extensively in carbonate‐prone basins worldwide. They can form large reservoirs and provide efficient pathways for hydrocarbon migration, but they also create serious engineering geohazards. The full delineation of potentially buried paleokarst plays an important role reservoir characterization, oil gas production, other tasks. We propose a supervised convolutional neural network (CNN) to automatically accurately characterize associated collapse features...

I have developed an alternative narrative of seismic sedimentology from a geologist’s perspective. Seismic is high-resolution supplement for traditional, low-resolution stratigraphy, reflecting the fact that responds to sedimentary bodies differently at low and high resolution. stratigraphy model-driven method follows principles field geology well-based study subsurface sedimentology, it assumes reflections can duplicate geologic correlations. more data-driven approach based on understanding...

The seismic sedimentology characteristics of sub-clinoformal shallow-water meandering river delta can be comprehensively analyzed by core, well logging and 3-D data. This paper summarizes the sedimentary pattern Suning area in Raoyang sag, Jizhong depression Bohai Bay Basin. In area, there are eight fourth-order sequences recognized from upper part Sha 1 Member (Es1s) to Dong 3 (Ed3), reflecting periodical change lake level. From central shore, transgressive highstand systems tracts, color...

Conceptual models and real three-dimensional (3-D) seismic data show that in progradational carbonate platform margin slope deposits of the Kingdom Abo reservoir Permian basin, west Texas, primary reflection events do not necessarily follow clinoformal geologic-time surfaces. The frequency content controls dip architecture events. High-frequency tend to thinner, time-bounded clinoform depositional elements (time-stratigraphic units), whereas low-frequency image thicker, low-angle lithofacies...

Anomalous frequency spikes derived from complex-trace analysis have long been considered more as a flaw of algorithms than valuable seismic attribute. However, synthetic models and field data show that instantaneous are clearly linked to physical could help geologic interpretations data. Frequency related relative amplitude minima along trace occur either at the merging point top base reflections wedge (type I) or tip II). A type II spike is indicative seismically thin bed (average [Formula:...

Lithostratigraphic plays are one of the major targets for reserve growth in nonmarine Songliao Basin, China. In this article, an integrated approach was adopted that applies principles and techniques sequence stratigraphy seismic sedimentology to study higher order sequences, depositional environments, lithostratigraphic trapping styles. Sifangtuozi area, 20 (fourth- or fifth-order) sequences four third-order were identified Upper Cretaceous interval using well data. Core description...

Despite routine demand from petroleum explorationists and field developers, interpreting (inverting) seismic data for reservoir thickness acoustic impedance (AI) or lithology volume requires a high-quality, unbiased well database the special skills of elite geophysicists. I have developed new method, based on linear combination color blending multiple-frequency panels, to estimate AI without strict implementation complex mathematics extensive control. Aimed at readjusting thin-bed tuning...

The Lower Cretaceous stratigraphic section in the northern Gulf of Mexico (GOM) comprises several well-documented carbonate systems that have prominent shelf-margin buildups, including Berriasian Knowles Limestone ramp and shelf system, Barremian Sligo Formation Aptian Pearsall Albian Glen Rose, Edwards, Stuart City Formations systems. Two lesser known but large-scale Valanginian to are documented this investigation using core, wireline-log, regional 2D seismic data. platform-margin...

Large amounts of natural gas have been discovered recently, both in carbonate reservoirs and shales the Sinian–Silurian strata Sichuan Basin, southern China. Although numerous studies conducted to learn about accumulation conventional shale gas, generation history, origins two types resources basin remain unclear. In this study, hydrocarbon histories Cambrian Silurian source rocks were reconstructed on basis thermal history kinetic parameters. Intensive cracking crude oil generate...

This study applied seismic-sedimentological workflow to deeply buried marine carbonate sequences in western China. The aimed at integrating core, wire line log and 3D seismic data investigate the paleogeomorphology qualitatively reservoir thickness quantitatively systems. In Gaoshiti-Moxi area of Sichuan Basin, Longwangmiao Formation was formed sedimentary environment platform facies. Lithofacies vary from dolomitized grainstone mudstone, which shoal, lagoon, deep shelf sub-facies....