Oolitic shoal complexes characterization of the Lower Triassic Feixianguan Formation in the Yuanba Gas Field, Northeast Sichuan Basin, China

Chen, Lei; Lu, Yongchao; Xiao-yue, FU; Xing, Fengcun; Wang, Chao; Luo, Chan

doi:10.1016/j.marpetgeo.2017.03.009

Cited by 18 publications

(13 citation statements)

References 38 publications

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“…Reservoir share similar features of the Puguang Changhsingian Formation; the lithofacies including dolomitized biolithites, dolomitized bioclastic limestones, and bioclastic micritic dolomites. Two depositional systems of the reef are recognized in the Yuanba gas reservoirs, including a homoclinal ramp and a rimmed carbonate platform system [37][38][39]. All the major lithofacies discerned within the Yuanba core sample, including framestone, bafflestone, bindstone, bioclastic packstone/grainstone/wackestone and dolomite, can correspond to the Jiantianba reef study.…”

Section: Implications For Comparative Analysismentioning

confidence: 85%

“…Three prominent sedimentary cycle have been distinguished within these reefs, indicating their development are controlled by similar oceanographic condition and the uniform relative sea-level change. In contrast, platform marginal reefs developed at both sides of the Kaijiang Liangping trough, such as Yuanba and Puguang as indicated by seismic data, logging information and well core [36][37][38]. The giant Puguang gas field discovered in the eastern Sichuan which is located at the eastern side of the Kanjiang Liangping trough.…”

Section: Implications For Comparative Analysismentioning

confidence: 99%

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Depositional Architecture and Facies of a Complete Reef Complex Succession: A Case Study of the Permian Jiantianba Reefs, Western Hubei, South China

et al. 2018

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The Upper Permian Changhsingian Jiantissanba reef complex is a well-known platform marginal reef, located in the western Hubei Province, China. Based on field observations and lithological analysis of the entire exposed reef complex, 12 reef facies have been distinguished according to their sedimentary components and growth fabrics. Each of the lithofacies is associated with a specific marine environment. Vertically traceable stratal patterns reveal 4 types of the lithologic associations of the Jiantianba reef: (1) heterozoan reef core association: developed in the deep marginal platform with muddy composition; (2) photozoan reef core association developed within the photic zone; (3) tide-controlled reef crest association with tidal-dominated characteristic of lithofacies in the shallow water; and (4) reef-bank association dominated by bioclastic components. The entire reef complex shows a complete reef succession revealing a function of the wave-resistant and morphological units. This study displays a complete sedimentary succession of Jiantianba reef, which provides a more accurate and comprehensive description of the reef lithofacies and a better understanding of the structure and composition of organic reefs.

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Section: Implications For Comparative Analysismentioning

confidence: 85%

Section: Implications For Comparative Analysismentioning

confidence: 99%

Depositional Architecture and Facies of a Complete Reef Complex Succession: A Case Study of the Permian Jiantianba Reefs, Western Hubei, South China

et al. 2018

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“…Interpretation.---The dominance of ooids in this facies association indicates accumulation in high-energy, shallow-water settings (Chen et al, 2017). The iron in these accumulations could have been transported from the continent to the sea as Fe-bearing detritus or Fe-clay colloids by river currents (Maynard, 1983;Einsele, 2000).…”

Section: Iron-rich Oolitic Shoal (Fa5b)mentioning

confidence: 91%

Sedimentology and stratigraphic architecture of a fluvial to shallow-marine succession: The Jurassic Dhruma Formation, Saudi Arabia

Alshammari

Mountney

Colombera

et al. 2021

Journal of Sedimentary Research

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The interaction of fluvial, tidal, and wave processes in coastal and paralic environments gives rise to sedimentary successions with highly varied styles of facies architecture; these are determined by the morphology and evolutionary behavior of the range of coastal sub-environments, which may be difficult to diagnose in subsurface sedimentary successions with limited well control. This study presents depositional models to account for stratigraphic complexity in a subsurface fluvial to shallow-marine succession, the Middle Jurassic Dhruma Formation, Saudi Arabia. The study achieves the following: i) it examines and demonstrates sedimentary relationships between various fluvial, nearshore, and shallow-marine deposits, ii) it develops depositional models to account for the stratigraphic complexity inherent in fluvial to shallow-marine successions, and iii) it documents the sedimentology and the stratigraphic evolutionary patterns of the lower Dhruma Formation in the studied area of Saudi Arabia. The dataset comprises facies descriptions of 570 m of core from 14 wells, 77 representative core thin sections, 14 gamma-ray logs, and FMI image logs from 4 wells. These data are integrated with quantitative information from > 50 analogous systems from a wide range of modern and ancient settings, stored in a relational database. Stratigraphic correlations reveal the internal anatomy of the succession. Facies associations are representative of fluvial channels, intertidal flats, pedogenically modified supratidal flats or floodplains, river-influenced tidal bars, weakly storm-affected shoreface and offshore-transition zones, storm-dominated delta-front and prodelta settings, and an open-marine carbonate-dominated shelf. These sub-environments interacted in a complex way through space and time. The vertical succession of the studied interval records an overall transition from coastal-plain deposits at the base to marine deposits at the top. As such, the succession records a long-term transgressive, deepening-upward trend. However, this general trend is punctuated by repeated progradational events whereby coastal sand bodies of fluvial, wave, and tidal origin prograded basinward during stillstands to fill bays along a coastline. The nature of juxtaposition of neighboring sub-environments has resulted in a sedimentary record that is highly complex compared to that generated by morphologically simple shoreface systems that accumulate more regularly ordered stratal packages.

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“…Reef-shoal complex reservoirs are acknowledged as important targets for hydrocarbon exploration throughout the world (Pomar, 1991;Kiessling et al, 1999;Grammer et al, 2001;Payne et al, 2006;Simaeys et al, 2017), which have also been widely reported in China, including those in the Ordovician of the Tarim Basin (Liu et al, 2006;Yang et al 2011), the Cambrian (Shi et al, 2013;Jin et al 2014) and the Permian and Triassic (Zhou et al, 2011;Chen et al, 2017;Ma et al 2007Ma et al , 2008 of the Sichuan Basin, and the Cenozoic of the Pearl River Mouth Basin (Chen, 2003;. Much progress has been made in characterizing the reef-shoal complex reservoirs, including their types, physical properties, genesis, and controlling factors (Choquette and Pray, 1970;Shen et al, 2008;Han et al, 2011;Qu et al, 2013;Zhang et al, , 2017.…”

Section: Introductionmentioning

confidence: 99%

Differences between reservoirs in the intra-platform and platform margin reef-shoal complexes of the Upper Ordovician Lianglitag Formation in the Tazhong oil field, NW China, and corresponding exploration strategies

Zhang

Tan

Sun

et al. 2018

Marine and Petroleum Geology

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The Upper Ordovician Lianglitag Formation in the Tazhong oil field, NW China, is dominantly composed of shallow marine carbonates, and it can be subdivided into five members lithologically. Unclear understanding of the reservoir evolution in the platform margin and intra-platform reef-shoal complexes resulted in difficulty in locating reservoirs and poor drilling success in the intra-platform. By comparing the basic characteristics, diagenesis, and porosity evolution of the two types of reservoirs, this study established their development patterns and proposed corresponding exploration strategies based on comprehensive analysis of core, thin-section, well-logging, three-dimensional seismic, and geochemistry data. The major difference between the platform margin and intra-platform reservoirs lied in their pore types. The platform margin reservoirs had fabric-selective intragranular dissolution pores, intergranular dissolution pores, moldic pores, and non-fabric-selective karst fractures and caves, and tectonic fractures, whereas the intra-platform ones only had tectonic fractures, intercrystalline dissolution pores, and intergranular vugs. In terms of distribution, the platform margin reservoirs were mainly distributed in the parasequence top and landform highlands of the highstand system tract in Members 3 to 1, appearing in two to six cycles, with large single layer and accumulative thicknesses and a quasi-bedded continuous distribution in the lateral. However, the distribution of the intra-platform ones was not obviously correlated with sedimentary facies and paleogeomorphology, with smaller single layer and accumulative thicknesses and poorer lateral continuity. The evolution and distribution of high-quality reservoirs in the platform margin were jointly controlled by eogenetic marine diagenetic and meteoric dissolution including karst, burial dissolution, and tectonic fractures. In comparison, eogenetic marine diagenetic and meteoric dissolution in the intra-platform reef-shoal complexes were weak, accompanied by persistent cementation. The favorable reservoirs were primarily controlled by fractures and later burial dissolution. Hence, for the exploration of the platform margin reef-shoal complex reservoirs, the priority should be given to the areas with the superimposition of eogenetic marine diagenetic and meteoric dissolution, burial dissolution, and tectonic fracturing. For the exploration of intra-platform reef-shoal complex reservoirs, more attention should be paid to areas with overlapped fractures and burial dissolution, especially where Hercynian strike-slip faults and early fractures were superimposed. Less attention should be paid to the areas with eogenetic marine diagenetic and meteoric dissolution.

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Oolitic shoal complexes characterization of the Lower Triassic Feixianguan Formation in the Yuanba Gas Field, Northeast Sichuan Basin, China

Cited by 18 publications

References 38 publications

Depositional Architecture and Facies of a Complete Reef Complex Succession: A Case Study of the Permian Jiantianba Reefs, Western Hubei, South China

Depositional Architecture and Facies of a Complete Reef Complex Succession: A Case Study of the Permian Jiantianba Reefs, Western Hubei, South China

Sedimentology and stratigraphic architecture of a fluvial to shallow-marine succession: The Jurassic Dhruma Formation, Saudi Arabia

Differences between reservoirs in the intra-platform and platform margin reef-shoal complexes of the Upper Ordovician Lianglitag Formation in the Tazhong oil field, NW China, and corresponding exploration strategies

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