Characteristics and Enrichment Factors of Supergiant Lower Cambrian Longwangmiao Gas Reservoir in Anyue Gas Field: The Oldest and Largest Single Monoblock Gas Reservoir in China

Li, Changwei; Wen, L.; Tao, Shizhen

doi:10.1260/0144-5987.33.6.827

Cited by 8 publications

(6 citation statements)

References 29 publications

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“…The thicknesses of the Deng 2 and Deng 4 Members, respectively, vary with the range of 28-340 and 47.75-148.23 m, with corresponding average thicknesses of 93.36 and 88.54 m. The Qiongzhusi shales act as the seal with porosity of < 3%, permeability of (0.001-0.02) Â 10 À3 mm 2 , average throat radius of 0.6-1.2 mm (Zhang et al, 2015). As for the Longwangmiao reservoirs, the main reservoir spaces are pores (holes), and the main lithology is shoal-related sandy dolomites (Figures 4 and 5) (Li et al, 2015b). The maximum porosity and permeability of this reservoir are 18.48% and 4.24 mD, respectively, with corresponding mean values of 4.78% and 0.0005-78.5 mD.…”

Section: Widely Distributed Multiple Sets Of High-quality Source Rocksmentioning

confidence: 86%

“…As for the Longwangmiao reservoirs, the main reservoir spaces are pores (holes), and the main lithology is shoal-related sandy dolomites (Figures 4 and 5) (Li et al., 2015b). The maximum porosity and permeability of this reservoir are 18.48% and 4.24 mD, respectively, with corresponding mean values of 4.78% and 0.0005–78.5 mD.…”

Section: Formation Conditions and Mechanism Of Giant Gas Fieldsmentioning

confidence: 99%

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Basic characteristics and accumulation mechanism of Sinian−Cambrian giant highly mature and oil-cracking gas reservoirs in the Sichuan Basin, SW China

Luo

Yang

Zhou

et al. 2017

Energy Exploration & Exploitation

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Old MesoproterozoicÀCambrian successions have been regarded as an important frontier field for global oil and gas exploration in the 21st century. This has been confirmed by a recent natural gas exploration breakthrough in the Sinian and Cambrian strata, central Sichuan Uplift, Sichuan Basin of SW China. However, the accumulation mechanism and enrichment rule of these gases have not been well characterized. This was addressed in this work, with aims to provide important guidance for the further exploration while enriching the general studies of the oil and gas geology in the old Mesoproterozoic-Cambrian strata. Results show that the gas field in the study area is featured by old target layers (Sinian-Lower Cambrian), large burial depth (>4500 m), multiple gas-bearing intervals (the second and fourth members of the Sinian Dengying Formation and the Lower Cambrian Longwangmiao Formation), various gas reservoir types (structural type and structural-lithologic type), large scale (giant), and superimposing and ubiquitous distribution. The giant reserves could be attributed to the extensive intercalation of pervasive high quality source rocks and large-scale karst reservoirs, which enables a three-dimensional hydrocarbon migration and accumulation pattern. The origin of natural gas is oil cracking, and the three critical stages of accumulation include the formation of oil reservoirs in Triassic, the cracking of oil in Cretaceous, and the adjustment and reaccumulations in the Paleogene. The main controlling factor of oil and gas enrichment is the inherited development of large-scale stable paleo-uplift, and the high points in the eastern paleo-uplift are the favorable area for natural gas exploration.

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Section: Widely Distributed Multiple Sets Of High-quality Source Rocksmentioning

confidence: 86%

Section: Formation Conditions and Mechanism Of Giant Gas Fieldsmentioning

confidence: 99%

Basic characteristics and accumulation mechanism of Sinian−Cambrian giant highly mature and oil-cracking gas reservoirs in the Sichuan Basin, SW China

Luo

Yang

Zhou

et al. 2017

Energy Exploration & Exploitation

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“…The Anyue field is located in the north slope zone of the Weiyuan uplift and gas accumulated under the control of the Gaoshiti-Moxi paleo-uplift. The dolomite grain beach reservoir body was mainly developed in the Cambrian period (Zou et al 2014b;Wei et al 2015b;Zhu et al 2015;Li et al 2015). The Gomez and Puckett fields are located at the anticlinal flanks of the Delaware and Val Verde basins.…”

Section: Characteristics Of Distributionmentioning

confidence: 99%

Formation and distribution characteristics of Proterozoic–Lower Paleozoic marine giant oil and gas fields worldwide

et al. 2017

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There are rich oil and gas resources in marine carbonate strata worldwide. Although most of the oil and gas reserves discovered so far are mainly distributed in Mesozoic, Cenozoic, and upper Paleozoic strata, oil and gas exploration in the Proterozoic-Lower Paleozoic (PLP) strata-the oldest marine strata-has been very limited. To more clearly understand the oil and gas formation conditions and distributions in the PLP marine carbonate strata, we analyzed and characterized the petroleum geological conditions, oil and gas reservoir types, and their distributions in thirteen giant oil and gas fields worldwide. This study reveals the main factors controlling their formation and distribution. Our analyses show that the source rocks for these giant oil and gas fields are mainly shale with a great abundance of type I-II organic matter and a high thermal evolution extent. The reservoirs are mainly gas reservoirs, and the reservoir rocks are dominated by dolomite. The reservoir types are mainly karst and reef-shoal bodies with well-developed dissolved pores and cavities, intercrystalline pores, and fractures. These reservoirs are highly heterogeneous. The burial depth of the reservoirs is highly variable and somewhat negatively correlated to the porosity. The cap rocks are mainly thick evaporites and shales, with the thickness of the cap rocks positively correlated to the oil and gas reserves. The development of high-quality evaporite cap rock is highly favorable for oil and gas preservation. We identified four hydrocarbon generation models, and that the major source rocks have undergone a long period of burial and thermal evolution and are characterized by early and long periods of hydrocarbon generation. These giant oil and gas fields have diverse types of reservoirs and are mainly distributed in paleo-uplifts, slope zones, and platform margin reef-shoal bodies. The main factors that control their formation and distribution were identified, enabling the prediction of new favorable areas for oil and gas exploration.

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“…The Sichuan Basin in the South China Block records multiple tectonic events (e.g., Ordovician-Devonian Caledonian, Late Triassic Indosinian, Late Jurassic Yanshan, and the Cenozoic Himalaya orogenies) (Chen and Wilson, 1996;Dai et al, 2009;Harrowfield and Wilson, 2005;Jin et al, 2010;Sun, 2011;Yan et al, 2011). The majority of the hydrocarbon reserves of the Sichuan Basin are distributed close to its border regions (e.g., Longmen Shan Thrust belt, Micang Shan Uplift, Daba Shan Orogenies) (Li et al, 2015;Li et al, 2001;Liu et al, 2011;Ma et al, 2010) (Fig. 1B).…”

Section: Introductionmentioning

confidence: 99%

Petroleum-generation timing and source in the northern Longmen Shan thrust belt, Southwest China: Implications for multiple oil-generation episodes and sources

Gao¹,

Shen²,

Selby³

et al. 2018

Bulletin

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The temporal evolution of hydrocarbons (~500 million barrels oil) and its relationship to the orogenic events of the Longmen Shan Thrust Belt have been extensively debated. The hydrocarbons occur as solid bitumen, as dykes and/or coatings within/along faults/fractures, and as present day oil seeps. Here utilizing organic geochemistry, we demonstrate that all the bitumen exhibit similar organo-gechemical characteristics, and were sourced from the Late Neoproterozoic-Early Cambrian Doushantuo and Qiongzhusi formations. In contrast, the organic geochemistry of the present day oil seeps are distinct from that of the bitumen, and suggest that the source is the Permain This is a revised version with the manuscript Number BLTN16-230 Petroleum generation timing and source in the Northern Longmen Shan Thrust Belt, Southwest China: Implications for multiple oil generation episodes and sources

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Characteristics and Enrichment Factors of Supergiant Lower Cambrian Longwangmiao Gas Reservoir in Anyue Gas Field: The Oldest and Largest Single Monoblock Gas Reservoir in China

Cited by 8 publications

References 29 publications

Basic characteristics and accumulation mechanism of Sinian−Cambrian giant highly mature and oil-cracking gas reservoirs in the Sichuan Basin, SW China

Basic characteristics and accumulation mechanism of Sinian−Cambrian giant highly mature and oil-cracking gas reservoirs in the Sichuan Basin, SW China

Formation and distribution characteristics of Proterozoic–Lower Paleozoic marine giant oil and gas fields worldwide

Petroleum-generation timing and source in the northern Longmen Shan thrust belt, Southwest China: Implications for multiple oil-generation episodes and sources

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