Quality variations and controlling factors of deepwater submarine-fan reservoirs, Rovuma Basin, East Africa

Wang, Min; ZHANG, Jiajia; WANG, Ruifeng; XU, Qingyan; WEN, Siying; Cao, Quanbin; YU, Jitao; WANG, Li

doi:10.1016/s1876-3804(22)60046-6

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…They are formed by the migration and stacking of sedimentary units from distinct periods, showcasing complex vertical changes and strong heterogeneity. For instance, the Paleogene reservoirs in the Luwuma Basin of East Africa are mainly composed of channel and cluster sedimentation [63,64]. Due to the simultaneous influence of bottom flow during sedimentation, turbidite sand bodies in this area have evolved into high-quality reservoirs with pure sand and favorable petrophysical properties.…”

Section: Efficient Systems For Oil and Gas Migrationmentioning

confidence: 99%

Characteristics of Deepwater Oil and Gas Distribution along the Silk Road and Their Controlling Factors

Wang,

Liang,

Zhao

et al. 2024

Water

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Deepwater regions have emerged as pivotal domains for global oil and gas exploration and development, serving as strategic alternatives to conventional resources. The Silk Road region is distinguished by its abundant oil and gas reserves and stands as a leading arena for worldwide exploration and development in the oil and gas sector. Since 2012, a series of atmospheric fields have been discovered in the deep sea of the Luwuma Basin and the Tanzania Basin, with cumulative recoverable reserves reaching 4.4 × 1012 and 8.3 × 1011 m3, including multiple oil and gas fields ranking among the top ten global discoveries at that time. Profound advancements have been achieved in the exploration of deepwater oil and gas reserves along the Silk Road. However, deepwater oil and gas exploration presents challenges, such as high development costs and risks, leading to certain areas remaining underexplored and exhibiting a relatively low level of exploration activity, thereby hinting at considerable untapped potential. Deepwater sedimentary basins along the Silk Road predominantly adhere to a distribution pattern characterized as “one horizontal and one vertical”. The “horizontal” dimension refers to the deepwater basin grouping within the Neo-Tethys tectonic domain, primarily extending from east to west. Conversely, the “vertical” dimension denotes the deepwater basin grouping along the East African continental margin, predominantly extending from north to south. Recent discoveries of deepwater oil and gas reserves validate the presence of foundational elements within Silk Road basins conducive to the formation of substantial oil and gas reservoirs and the establishment of efficient migration pathways. Despite these achievements, exploration activities in deepwater oil and gas resources along the Silk Road remain relatively limited. Future exploration endeavors in deepwater regions will predominantly focus on identifying structural and lithological traps. In the deepwater areas of the Bay of Bengal, the emphasis is on lithological traps formed by Neogene turbidite sandstone deposits. In the deepwater regions of Pakistan, the focus shifts to lithological traps emerging from Neogene bio-reefs and river-channel sandstone accumulations. Along the deepwater coastline of East Africa, the focus is on lithological traps formed by nearshore Mesozoic–Cenozoic bio-reefs and seafloor turbidite sandstone formations. Within the deepwater regions of Southeast Asia, the primary objective is to locate large structural-type oil and gas fields. Analyzing the characteristics of oil and gas discoveries in deepwater areas aims to enhance the theory of the control of the formation of deepwater oil and gas, providing valuable insights for predicting future exploration directions.

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Section: Efficient Systems For Oil and Gas Migrationmentioning

confidence: 99%

Characteristics of Deepwater Oil and Gas Distribution along the Silk Road and Their Controlling Factors

Wang,

Liang,

Zhao

et al. 2024

Water

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“…Therefore, compaction and pore reduction are the main factors for pore reduction in the Dawangzhuang area, and anti-compaction has become a prerequisite for the development of high-quality reservoirs in the Raoyang sag. There are many factors affecting compaction, such as burial depth, sediment composition, grain size, sorting, early cementation, dissolution, geothermal gradient and abnormally high-pressure zones (Dar et al 2022;Wang et al 2022). These factors will cause the porosity development zone to be different from the normal compaction trend, which is of great significance to reservoir research.…”

Section: Compactionmentioning

confidence: 99%

Lower limit of effective reservoir physical properties and controlling factors of medium-deep clastic reservoirs: a case study of the Dawangzhuang area in Raoyang sag, Bohai Bay Basin

Zhai

Lv²,

Gao³

et al. 2023

J Petrol Explor Prod Technol

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With the continuous improvement of oil and gas exploration in the middle and shallow layers, the deep Paleogene in Raoyang sag has become an important exploration field of “increasing reserves and production” in North China. The recognition and control factors of deep effective reservoirs are unclear, which restricts the recognition effect of oil and gas exploration. The key to identify effective reservoirs is to determine the lower limit standard of reservoir physical properties. The single method for calculating the lower limit of physical properties has limitations. The lower limit of the effective reservoir physical properties of the Shahejie Formation in the Dawangzhuang area was obtained by comprehensively using physical property, well logging and oil test data. The data were analysed by oil testing method, metre oil production index test method and frequency curve intersection method. On this basis, combined with the cast thin-section observations, scanning electron microscopy and other test results, the comprehensive control of effective reservoir development of the Shahejie Formation in the Dawangzhuang area of the Raoyang sag was studied from various factors, such as formation pressure, sand body thickness and diagenesis. The results show that the lower limit of porosity was 9.73, 9.44 and 8.85% at depths of Es1, Es2 and Es3, respectively. The lower limit of permeability was 1.21 × 10–3, 1.18 × 10–3 and 0.59 × 10–3 μm2, respectively. Effective reservoirs are easier to form in areas with formation pressure coefficient greater than 1.2. Formation overpressure inhibits compaction and promotes dissolution. The proportion of effective reservoirs of sand bodies with thicknesses greater than 2 m can reach more than 75%. The influence of diagenesis on the reservoir is mainly manifested in compaction and cementation making the reservoir compact. The porosity reduction rate caused by compaction can reach 20–75%, while dissolution makes the reservoir form secondary pores. The average pore throat radius of secondary pores can reach 4 ~ 6.3 µm. This study makes use of the applicability of different methods, which is more instructive for predicting the effective reservoir of the Shahejie Formation in the study area. In addition, the research results provide a reference for the development mechanism of medium-deep clastic reservoirs.

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Reformation of deep clastic reservoirs with different diagenetic intensities by microfractures during late rapid deep burial: Implications from diagenetic physical simulation of Cretaceous Qingshuihe Formation in the southern margin of Junggar Basin, NW China

Jin

XIAN

LIAN

et al. 2023

Petroleum Exploration and Development

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Quality variations and controlling factors of deepwater submarine-fan reservoirs, Rovuma Basin, East Africa

Cited by 6 publications

References 14 publications

Characteristics of Deepwater Oil and Gas Distribution along the Silk Road and Their Controlling Factors

Characteristics of Deepwater Oil and Gas Distribution along the Silk Road and Their Controlling Factors

Lower limit of effective reservoir physical properties and controlling factors of medium-deep clastic reservoirs: a case study of the Dawangzhuang area in Raoyang sag, Bohai Bay Basin

Reformation of deep clastic reservoirs with different diagenetic intensities by microfractures during late rapid deep burial: Implications from diagenetic physical simulation of Cretaceous Qingshuihe Formation in the southern margin of Junggar Basin, NW China

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