Reservoir Characteristics and Its Mainly Controlling Factors of Dolomite in the Late Ediacaran Dengying Formation, Central Sichuan Basin,sw China

Wang, Jingyi; Hu, Mingzeng; Jiang, Fujie; Li, Sumei

doi:10.1130/abs/2019am-340743

Cited by 3 publications

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“…For example, controlled by mound and shoal facies as well as hypergene dissolution and influenced by multiple episodes of the Tongwan Movement, Sinian Dengying reservoir rocks in the study area are extensively distributed within the whole basin (Hao et al., 2017; Wang et al., 2016; Yao et al., 2014). According to prediction results by seismic data (Figure 4), it is suggested that the Deng 2 Member reservoirs in the Gaoshiti–Moxi Area are generally thicker than 50 m, and the area with thickness over 80 m can reach approximately 1500 km 2 .…”

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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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: 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 Deng IV Member, deposited on a carbonate ramp, is regarded as its crucial objective layer with a proven reserve of more than 680 billion cubic metres, accounting for 58% of the cumulative proven reserve by the end of 2021. The rock types of the Deng IV Member include light to dark grey algal dolomite, stromatolite, thrombolite, laminate, dolostone with intraclastic grains, crystalline dolostone, siliceous dolostone, lime–dolostone, brecciated dolostone, and dolomitic mudstone, among which the former four are associated with algae and are favourable for reservoirs 13 , 14 . In the reservoirs of the Deng IV Member, the reservoir space is composed of fenestral pores, interparticle dissolution pores, intercrystal dissolution pores, karst pores, cavities, and fractures 11 .…”

Section: Introductionmentioning

confidence: 99%

Microbial carbonate reservoir characteristics and their depositional effects, the IV Member of Dengying Formation, Gaoshiti-Moxi area, Sichuan Basin, Southwest China

Wang,

Yan

et al. 2023

Sci Rep

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Previous scientific research on reservoirs of the Deng IV Member in the Gaoshiti-Moxi area, the main production area of the Anyue gas field with reserves of tens of billions of cubic metres, has focused on karst palaeogeomorphology reconstruction, the facies distribution on platform margins, and their effects on creating favourable reservoirs. However, the quality of microbial carbonate reservoirs is also closely related to their original depositional environments on both inner and marginal platforms. Therefore, this paper attempts to reveal favourable microbial carbonate reservoir characteristics and the sedimentary effects on their distribution and prediction based predominantly on a synthetic analysis of the sequence stratigraphy and depositional facies. The results show that favourable reservoirs of the Deng IV Member are classified into three types according to their reservoir spaces: fracture-cavity, pore-cavity and pore reservoirs. Secondary dissolution pores and cavities are primary reservoir spaces developed mainly in nonskeletal grain dolomites with sparry cements, thrombolites, and stromatolites. The physical properties of the fracture-cavity and pore-cavity types of reservoirs are better than those of pore reservoirs and have porosities between 1 and 5% and permeabilities between 0.01 × 10–3 and 1 × 10–3 μm2. Vertically, favourable reservoirs are developed mainly in parasequence set 6 (PSS6) and PSS7 and are laterally distributed in well zone MX9-MX19-MX1 for the fracture-cavity type, MX105-MX110-GS20 for the pore-cavity type and MX17-MX107-MX41-MX102-GS102 for the pore type. Moreover, depositional effects on reservoirs in terms of depositional sequences, seismic facies, microfacies and microfacies associations indicate that to some extent, the fracture-cavity type of reservoir is constrained by the top boundaries of PSS7, PSS2, parasequence 17 (PS17) and PS14; the pore-cavity type of reservoir is constrained by the top boundaries of PSS7, PSS4, PS18 and PS12; and the pore type of reservoir is constrained by the top boundaries of PSS7, PSS6, PSS3, PSS2, PS18, PS17, PS14, and PS12. Seismic facies associated with shoals and mound-flat complexes are related to the facies distributions of pore cavities and pore reservoirs. MA1, MA3, MA7, and MA8 are predominant microfacies associations of favourable reservoirs of the Deng IV Member in the Gaoshiti-Moxi area. The above results are significant for further petroleum exploration and exploitation of ultradeep microbial carbonate reservoirs in this area.

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“…The Deng IV Member, deposited on a carbonate ramp, is regarded as its crucial objective layer with the proved reserve of more than 680 billion cubic meters accounting for 58% of the cumulative proved reserve by the end of 2021. The rock types of the Deng IV Member include light to dark grey algal dolorenite, stromatolite, thrombolite, laminate, intraclastic grain dolostone, crystalline dolostone, siliceous dolostone, lime dolostone, breccia dolostone, and dolomitic mudstone, among which the former four associated with algae are favorable for reservoirs (Wang et al 2016;Wang et al 2021). In the reservoirs of the Deng IV Member, the space types are composed of pores of fenestral pores, inter-particle dissolution pores, inter-crystal dissolution pores, karst pores, cavities, and fractures (Zhai et al 2017).…”

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confidence: 99%

Depositional characteristics of microbial carbonate reservoir and their effects on favorable reservoir distributions of the IV Member of Sinian Dengying Formation, Gaoshiti-Moxi area, Sichuan Basin, Southwest China

Wang

Shao-yong

Huang

et al. 2023

Preprint

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Previous scientific research on reservoirs of the Deng IV Member in Gaoshiti-Moxi area, the main production area of Anyue gas field with tens of billions of cubic meters reserves, concerns on karst paleogeomorphology reconstruction, facies distribution on platform margin and their effects on favorable reservoirs. However, the quality of microbial carbonate reservoirs is also closely related with their original depositional environments on the whole platform, which is significant for further petroleum exploration and exploitation of ultra-deep carbonate reservoirs in this area. Therefore, this paper attempts to reveal favorable microbial carbonate reservoir characteristics and sedimentary effects on their distribution and prediction, based dominantly on synthetic analysis of depositional characteristics, including both sequence stratigraphy and facies, such as seismic facies, microfacies and microfacies associations. The results show that favorable reservoirs of the Deng IV Member are classified into three types according to their space types, namely, fracture-cavity reservoir, pore-cavity reservoir and pore. Secondary dissolution pores and cavities are primary reservoir spaces developed mainly in non-skeletal grain dolomites with sparry cements, thrombolites, and stromatolites in microfacies association 1 (MA1), MA2, MA5, and MA7. Physical property of fracture-cavity type of reservoir is better in the upper and lower parasequence sets with a porosity between 1% and 5%, a permeability between 0.01 × 10− 3 µm2 and 1 × 10− 3 µm2; physical property of pore-cavity reservoir is fine throughout all the parasequence sets with a porosity between 2% and 4%, a permeability between 0.01 × 10− 3 µm2 and 1 × 10− 3 µm2; physical property of pore-cavity reservoir is the worst. In vertical, the favorable reservoirs are developed mainly in parasequence set 6 (PSS6) and PSS7 in vertical. On planar, they are distributed in well zone MX9-MX19-MX1 for the fracture-cavity type, MX105-MX110-GS20 for the pore-cavity type and MX17-MX107-MX41-MX102-GS102 for the pore type. What’s more, effects of depositional sequences, seismic facies, microfacies and microfacies associations on reservoir distribution indicate that to some extent, fracture-cavity type of reservoir is constrained by the top boundaries of PSS7, PSS2, parasequence 17 (PS17) and PS14; pore-cavity type of reservoir by the top boundaries of PSS7, PSS4, PS18 and PS12; pore type of reservoir by the top boundaries of PSS7, PSS6, PSS3, PSS2, PS18, PS17, PS14, and PS12. Seismic facies associated with shoals and of mound-flat complex are related with facies distributions of pore cavity and pore reservoirs. MA1, MA3, MA7, MA8 are predominant microfacies associations of favorable reservoirs of the Deng IV Member in Gaoshiti-Moxi area.

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Reservoir Characteristics and Its Mainly Controlling Factors of Dolomite in the Late Ediacaran Dengying Formation, Central Sichuan Basin,sw China

Cited by 3 publications

References 0 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

Microbial carbonate reservoir characteristics and their depositional effects, the IV Member of Dengying Formation, Gaoshiti-Moxi area, Sichuan Basin, Southwest China

Depositional characteristics of microbial carbonate reservoir and their effects on favorable reservoir distributions of the IV Member of Sinian Dengying Formation, Gaoshiti-Moxi area, Sichuan Basin, Southwest China

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