Gas accumulation conditions and key technologies for exploration &amp; development of Sulige gasfield

Fu, Jinhua; Fan, Liyong; Liu, Xinshe; Huang, Daojun

doi:10.1016/j.ptlrs.2018.06.002

Cited by 16 publications

(10 citation statements)

References 5 publications

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“…Since 2007, the Sulige gas field has insisted on the integration of exploration and development, and the scale of new gas reserves exceeded 5,000×10 8 m 3 per year for seven consecutive years (Yang and Liu, 2014). At present, the exploration area of the Sulige gas field is about 5.5×10 4 km 2 , with total gas resources of 6×10 12 m 3 , proven gas-bearing area is 3.88×10 4 km 2 , accumulated tertiary reserves reaches 4.77×10 12 m 3 , and the natural gas production reaches 2.7×10 10 m 3 in 2020, which becomes a key area for increasing natural gas storage and production in the Changqing Oilfield and an important natural gas gathering area in China (Fu et al, 2019;Jia et al, 2018;Jia et al, 2021). It makes a significant contributions on guaranteeing a safe and stable gas supply in the Capital, North China, and areas around the field.…”

Section: Regional Geological Backgroundmentioning

confidence: 99%

“…The Sulige gas field is the largest onshore monoblock natural gas field and also the largest unconventional tight gas field in China. The proven (including basic proven) gas reserves is 4.77×10 12 m 3 (Fu et al, 2019;Jia et al, 2021), the gas production is more than 300×10 8 m 3 in 2021 and the cumulative gas production is more than 2,900×10 8 m 3 . It plays an important role in ensuring national energy provision security, helping China's energy transformation and promoting green, low-carbon and high-quality development.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical Characteristics and Gas Source Contributions of Noble Gases of the Sulige Large Tight Gas Field of Upper Paleozoic in Ordos Basin, China

Wang

Hou

et al. 2022

Front. Earth Sci.

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Tight gas is the fastest developing unconventional natural gas resource, becoming the principal part for gas reserves and production growth in China. The Sulige gas field is the largest gas field and also the typical low porosity and low permeability tight sandstone gas field discovered in China, with an annual natural gas output exceeding 300 billion and cumulative output exceeding 290 billion, playing an important role in ensuring national energy provision, helping China’s energy transformation, and promoting green, low-carbon, environmental protection and high-quality development. Based on sample collection and laboratory analysis, natural gas compositions including hydrocarbons, non-hydrocarbons, light hydrocarbons, and noble gases of the Sulige gas field are systematically analyzed, their genetic identifications are identified, and finally gas source originations and contribution proportions are comprehensively discussed from the perspectives of noble gases and hydrocarbon gases. The main achievements are as follows: 1) natural gases in the Sulige gas field are mainly alkane gases, with high methane content, high drying coefficient, low heavy hydrocarbon contents, low non-hydrocarbon gas contents of CO2 and N2, and relatively low noble gas contents. The helium content is relative 2 order of magnitude higher than the atmospheric value, while neon, argon, krypton, and xenon are relatively about 1–2 orders of magnitudes lower than the atmospheric values. 2) The carbon and hydrogen isotopes of alkanes are generally positive sequence distributions with some part inversion. The 3He/4He values are mainly distributed in magnitude of 10−8, the 40Ar/36Ar is ranged from 506 to 1940, the 129Xe is relative loss, and the 132Xe is relative surplus. 3) Natural gases in the Sulige gas field are typical coal-formed gases generated from a humic organic mother material with maturity from high mature to over mature according to C7 and C8 light hydrocarbons and alkane carbon isotopes. Noble gases are typical crustal genesis, mainly originating from the radioactive decay of crustal source materials. 4) The gas source correlations of noble gases and alkane gases and their quantitative evaluations on source contributions show that natural gases in the Sulige gas field are originated from Carboniferous-Permian coal measure source rocks in Ordos Basin, mainly contributed by coals and supplemented by mudstones, accounting for 55–60% and 40–45%, respectively.

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Section: Regional Geological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics and Gas Source Contributions of Noble Gases of the Sulige Large Tight Gas Field of Upper Paleozoic in Ordos Basin, China

Wang

Hou

et al. 2022

Front. Earth Sci.

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“…1), lying north from Ejin Horo, south of Ansai, west of Hengshan, and east of Fugu. The studied area is a typical ultra-low porosity and ultra-low permeability gas reservoir, exhibiting poor reservoir physical properties, strong heterogeneity, and a complicated micropore structure (Ding et al, 2016;Yang et al, 2017;Fu et al, 2018).…”

Section: Geological Settingsmentioning

confidence: 99%

Controlling Effects of Tight Reservoir Micropore Structures on Seepage Ability: A Case Study of the Upper Paleozoic of the Eastern Ordos Basin, China

Yang

et al. 2020

Acta Geologica Sinica (Eng)

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In this study, the types of micropores in a reservoir are analyzed using casting thin section (CTS) observation and scanning electron microscopy (SEM) experiments. The high-pressure mercury injection (HPMI) and constant-rate mercury injection (CRMI) experiments are performed to study the micropore structure of the reservoir. Nuclear magnetic resonance (NMR), gas-water relative seepage, and gas-water two-phase displacement studies are performed to examine the seepage ability and parameters of the reservoir, and further analyses are done to confirm the controlling effects of reservoir micropore structures on seepage ability. The experimental results show that Benxi, Taiyuan, Shanxi, and Shihezi formations in the study area are typical ultra-low porosity and ultra-low permeability reservoirs. Owing to compaction and later diagenetic transformation, they contain few primary pores. Secondary pores are the main pore types of reservoirs in the study area. Six main types of secondary pores are: intergranular dissolved pores, intragranular dissolved pores, lithic dissolved pores, intercrystalline dissolved pores, micropores, and microfracture. The results show that reservoirs with small pore-throat radius, medium displacement pressure, and large differences in pore-throat structures are present in the study area. The four types of micropore structures observed are: lower displacement pressure and fine pores with medium-fine throats, low displacement pressure and fine micropores with fine throats, medium displacement pressure and micropores with micro-fine throats, and high displacement pressure and micropores with micro throats. The micropore structure is complex, and the reservoir seepage ability is poor in the study areas. The movable fluid saturation, range of the gas-water two-phase seepage zone, and displacement types are the three parameters that well represent the reservoir seepage ability. According to the characteristic parameters of microscopic pore structure and seepage characteristics, the reservoirs in the study area are classified into four types (I-IV), and types I, II, and III are the main types observed. From type I to type IV, the displacement pressure increases, and the movable fluid saturation and gas-water two-phase seepage zone decrease, and the displacement type changes from the reticulation-uniform displacement to dendritic and snake like. Key words: micro-pore structure, seepage ability, movable fluid saturation, the range of gas-water two phase seepage zone, displacement types Citation: Yang et al., 2020. Controlling Effects of Tight Reservoir Micropore Structures on Seepage Ability: A Case Study of the Upper

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“…The deepest gas reservoir in the world is the Mills Ranch Field in the Anadarko Basin of Western Oklahoma, and its target layer is the Lower Ordovician dolomite at a depth interval of 7663-8103 m, with a maximum single-well gas production rate of 6 × 10 4 m 3 /d and the recoverable gas initially in place of 365 × 10 8 m 3 (Bai and Cao, 2014;Jiao et al, 2015;Liu et al, 2020;Li et al, 2021). In China, a series of great progress has been made in the exploration of deep dolomite reservoirs, including those in the Ordovician-Cambrian of the Tarim Basin, Ordovician, and Cambrian in the Ordos Basin, as well as Permian, Sinian, and Cambrian in the Sichuan Basin (Qian et al, 2007;Zou et al, 2014;He et al, 2017;Zhang et al, 2017;Fu et al, 2019;Gao 2019). However, the deep dolomite reservoirs in China are formed in a way that is greatly different from that in other countries, as they are typically more ancient, deeper buried, and of longer formation processes (He et al, 2016;Zhang et al, 2017;Ma et al, 2019;Ma X. H. et al, 2019;Li et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Effects of diagenesis on quality of deep dolomite reservoirs: A case study of the Upper Cambrian Xixiangchi Formation in the eastern Sichuan Basin, China

Ren

Qin

Qin³

et al. 2022

Front. Earth Sci.

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With the Upper Cambrian Xixiangchi Formation in the eastern Sichuan Basin as the target, this study investigates various diagenetic events during different diagenetic stages in deep dolomite reservoirs, accompanied by evaluations of their effects on the formation and evolution of the reservoir rock. A series of experiments are implemented on core and outcrop samples, including petrologic analysis, fluid inclusion analysis, rare earth and minor element investigation, and carbon and oxygen isotope test. During the syngenetic (syndepositional and penecontemporaneous) diagenesis stage, dolomitization is closely related to evaporation concentration and seepage reflux of high-salinity seawater, which facilitates the reservoir rock development by greatly enhancing the permeability of the reservoir. Meanwhile, a small number of secondary pores are generated in the sediments subjected to episodic atmospheric exposure and thus affected by meteoric water. During the early diagenesis stage, recrystallization transforms part of the granular dolomite into the crystalline dolomite with or without the phantom of the grain texture. It also alters the original rock’s pore structure and improves the effective primary porosity. Thus, recrystallization is key in forming the crystalline dolomite reservoir rock. However, compaction, cementation, and filling lead to the loss of massive early-formed primary pores and some secondary pores. During the mesodiagenesis-late diagenesis stage, the burial karstification, related to organic matter maturation, is the most direct control factor of the effective reservoirs space formation, and its alteration effect on the reservoir rock is related to the early process. This research helps to better identify the impact of various diagenetic processes during different diagenetic stages upon the formation and evolution of the deep dolomite reservoir rock, and it also helps analyze the relationships among these diagenetic processes. The findings of this research provide valuable references for investigating the formation mechanism of the deep dolomite reservoir rock in the Sichuan Basin.

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Gas accumulation conditions and key technologies for exploration & development of Sulige gasfield

Cited by 16 publications

References 5 publications

Geochemical Characteristics and Gas Source Contributions of Noble Gases of the Sulige Large Tight Gas Field of Upper Paleozoic in Ordos Basin, China

Geochemical Characteristics and Gas Source Contributions of Noble Gases of the Sulige Large Tight Gas Field of Upper Paleozoic in Ordos Basin, China

Controlling Effects of Tight Reservoir Micropore Structures on Seepage Ability: A Case Study of the Upper Paleozoic of the Eastern Ordos Basin, China

Effects of diagenesis on quality of deep dolomite reservoirs: A case study of the Upper Cambrian Xixiangchi Formation in the eastern Sichuan Basin, China

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