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Petroleum reservoir

About: Petroleum reservoir is a research topic. Over the lifetime, 5403 publications have been published within this topic receiving 83535 citations. The topic is also known as: petroleum deposit.


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Journal ArticleDOI
TL;DR: In this paper, the Sarvak Formation was divided into nine zones, and the thinner sub-zones were used for further fine modeling procedure, which provided sophisticated distribution of petrophysical parameters throughout the grids of the model, and therefore it can handle strong heterogeneity of the complex reservoir.
Abstract: Introducing and applying an appropriate strategy for reservoir modeling in strongly heterogeneous and fractured reservoirs is a controversial issue in reservoir engineering. Various integration approaches have been introduced to combine different sources of information and model building techniques to handle heterogeneity in geological complex reservoir. However, most of these integration approaches in several studies fail on modeling strongly fractured limestone reservoir rocks of the Zagros belt in southwest Iran. In this study, we introduced a new strategy for appropriate modeling of a production formation fractured rock. Firstly, different rock types in the study area were identified based on well log data. Then, the Sarvak Formation was divided into nine zones, and the thinner subzones were used for further fine modeling procedure. These subzones were separated based on different fracture types and fracture distribution in each zone. This strategy provided sophisticated distribution of petrophysical parameters throughout the grids of the model, and therefore, it can handle strong heterogeneity of the complex reservoir. Afterward, petrophysical parameters were used to produce an up-scaled 3D gridded petrophysical model. Subsequently, maps of petrophysical properties were derived for each zone of the Sarvak Formation. Evidences achieved in this study indicates Sarvak Formation zone 2 as the target production zone with better performance of reservoir rock and the southwestern part of the field as area of maximum porosity.

31 citations

Journal ArticleDOI
Tang Jian-ming1, Huang Yue1, Xu Xiangrong1, John Tinnin2, James Hallin2 
TL;DR: The deep gas reservoirs of China's western Sichuan Basin are in Members 2 and 4 of the Upper Triassic Xujiahe Formation and contain mid-to large-sized gas fields like Xinchang, Hexingchang, Qiongxi, Zhongba, and Bajiaochang.
Abstract: The deep-gas reservoirs of China's western Sichuan Basin are in Members 2 and 4 of the Upper Triassic Xujiahe Formation. These reservoirs contain mid- to large-sized gas fields like Xinchang, Hexingchang, Qiongxi, Zhongba, and Bajiaochang. The favorable geological conditions for creating these fields include abundant source rock, well-developed reservoir rock, good preservation conditions, and structural traps.

31 citations

Proceedings ArticleDOI
15 Apr 1984
TL;DR: In this paper, a pilot water-flood has been conducted in the Tor Formation and expansion of waterflooding to a large area of the Tor is planned, where large saturation changes in the matrix rock must be achieved through water imbibition.
Abstract: The Ekofisk Field in the North Sea produces from two lithologically similar, low permeability fractured chalk formations. The Ekofisk Formation of Danian age is separated from the lower Tor Formation of Maastrichtian age by a tight zone of about 15 m thickness. With a projected primary recovery factor of only 18%, the secondary recovery target is substantial. A pilot waterflood has been conducted in the Tor Formation and expansion of waterflooding to a large area of the Tor is planned. For waterflooding to recover substantial oil in a highly fractured rock large saturation changes in the matrix rock must be achieved through water imbibition.

31 citations

Journal Article
TL;DR: In this article, a geochemical and fluid inclusion analysis from the Halal-1 and Fallig-1 wells and three Gebel Maghara coal mine boreholes document two rich gas-to mixed oil and gas-prone Jurassic source rocks.
Abstract: The Sinai Peninsula is defined by the tensional Gulf of Suez rift to the west, the left-lateral Dead Sea - Gulf of Aqaba rift to the east, and the Mediterranean passive trailing margin to the north. Wrench tectonics, culminating in the Late Cretaceous (Laramide), has long been proposed as the dominant structural force in the Sinai; however, much evidence exists to suggest that north-south to northwest-southeast compression associated with the Late Cretaceous Syrian Arc tectonic event resulted in deformation which is dominantly compressive in nature, including thin-skinned thrusts, detached box-folded packages, southward-verging asymmetric folds, overturned beds, and basement-involved forced folds. The structural evolution of the Sinai was extremely complex, with most structures having formed from a mix of compressional and right-lateral shear forces, commonly superimposed on an earlier structural fabric of extensional and/or strike-slip origin. In general, the more northern structures are increasingly compressional while the influence of wrenching increases to the south. Recent geochemical and fluid inclusion analyses from the Halal-1 and Fallig-1 wells and three Gebel Maghara coal mine boreholes document two rich gas-to mixed oil and gas-prone Jurassic source rocks. The source interval, previously unidentified in the Sinai, correlates to the Middle Jurassic-Khatatba Formation in Egypt's northern Western Desert, where numerous recent self-sourcing, self-sealing gas/condensate discoveries have been made. The presence of adequate source and reservoir rock along with the presence of numerous large structures expressed in the surface, provide several of the main elements required for a hydrocarbon play. Depth of burial/migration and seal/trap remain unproven; however, these should all be present in the northernmost Sinai.

31 citations

Book ChapterDOI
01 Jan 2012
TL;DR: An outcrop-behind outcrop study was conducted in and adjacent to a 300 100 16 m (980 330 50 ft) quarry of the gas-producing Woodford Shale to structurally/stratigraphically characterize it from the pore to subregional scales using a variety of techniques as mentioned in this paper.
Abstract: An outcrop-behind outcrop study was conducted in and adjacent to a 300 100 16 m (980 330 50 ft) quarry of the gas-producing Woodford Shale to structurally/stratigraphically characterize it from the pore to subregional scales using a variety of techniques. Strata around quarry walls were described and correlated to a 64 m (210 ft) long continuous core drilled 150 m (500 ft) back from the quarry wall and almost to the Woodford-Hunton unconformity. Borehole logs obtained include neutron and density porosity (NPHI and DPHI) logs, and logs from Elemental Capture Spectroscopy (ECS™), Combinable Magnetic Resonance (CMR-Plus™), Fullbore Formation MicroImager (FMI™), and sonic scanner (Modular Sonic Imaging Platform, or MSIP™)—all manufactured by Schlumberger. The strata around the quarry are horizontally bedded. Borehole logs were used to identify a basic threefold subdivision into an upper relatively porous quartzose interval; a middle, more clay-rich, and less porous interval; and a lower interval of intermediate quartz-clay content. These intervals correspond to the informally named upper, middle, and lower Woodford. Detailed core and quarry wall description revealed several types of finely laminated lithofacies, with varying amounts of total organic carbon (TOC). The FMI log revealed a much greater degree of variability in laminations than can be readily seen with the naked eye. Organic geochemistry and biomarkers are closely tied to these lithofacies and record cyclic variations in oxic-anoxic depositional environments, which correspond to relative sea level fall-rise cycles. At the scanning electron microscopy scale, microfractures and microchannels are common and provide tortuous pathways for gas (and oil) migration through the shales. Based on FMI and core analysis, fracture density is much greater in the upper quartzose lithofacies than in the lower, more clay-rich lithofacies. A laser imaging detection and ranging (LIDAR) survey around the quarry walls documented two near-vertical fracture trends in the quartzose lithofacies: one striking N85E with spacings of 1.2 m (4 ft) and the other striking N45E related to the present stress field. The FMI analysis only imaged the latter fracture set. Both log-derived and laboratory-tested geomechanical property measurements documented a significant relationship between shale fabric (laminations and preferred clay-particle orientation) and rock strength, and a secondary relationship to mineral composition. Porosity and microfractures or microchannels also appear to influence rock strength. This integrated study has provided insight into the causal relations among Woodford properties at a variety of scales. In particular, a stratigraphic (vertical) segregation of lithofacies can be related to cyclic variations in depositional environments. The resulting stratified zones exhibit variations in their hydrocarbon source and reservoir (fracturable) potential. Such information and predictive capability can be valuable for improved targeted horizontal drilling into enriched source rock and/or readily fracturable reservoir rock in the Woodford and perhaps other gas shales.

31 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202336
202280
2021172
2020179
2019242
2018212