Accumulation conditions and exploration and development of tight gas in the Upper Paleozoic of the Ordos Basin

Yang, Hua; Fu, Jinhua; Liu, Xinshe; Meng, Peilong

doi:10.1016/s1876-3804(12)60047-0

Cited by 140 publications

(59 citation statements)

References 4 publications

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“…The Upper Paleozoic coal-type gas in the Ordos Basin has been commonly accepted to be derived from the C 3 t-P 1 s coal-measure source rocks [19][20][21][22][23][24][25][26]. Only a set of humic source rocks, that is, the C 3 t-P 1 s coal measures, is developed in the Hangjinqi area in northern Ordos Basin.…”

Section: Source Of Tight Gasmentioning

confidence: 99%

“…Several giant Upper Paleozoic tight gas fields with proven reserves over 100 × 10 9 m 3 have been discovered in the Carboniferous-Permian tight sandstone, for example, Sulige, 2 Geofluids Yulin, Daniudi, Wushenqi, and Zizhou. The Upper Paleozoic natural gas is commonly considered as coal-type gas from the Carboniferous-Permian coal-measure source rocks [19][20][21][22][23][24][25][26]. However, the Lower Paleozoic natural gas was generally believed to be mixed by both coal-type gas from the Upper Paleozoic coal measures and oil-type gas from the marine source rocks [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Genetic Types and Source of the Upper Paleozoic Tight Gas in the Hangjinqi Area, Northern Ordos Basin, China

Liu

et al. 2017

Geofluids

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The molecular and stable isotopic compositions of the Upper Paleozoic tight gas in the Hangjinqi area in northern Ordos Basin were investigated to study the geochemical characteristics. The tight gas is mainly wet with the dryness coefficient (C 1 /C 1-5 ) of 0.853-0.951, and 13 C 1 and 2 H-C 1 values are ranging from −36.2‰ to −32.0‰ and from −199‰ to −174‰, respectively, with generally positive carbon and hydrogen isotopic series. Identification of gas origin indicates that tight gas is mainly coal-type gas, and it has been affected by mixing of oil-type gas in the wells from the Shilijiahan and Gongkahan zones adjacent to the Wulanjilinmiao and Borjianghaizi faults. Gas-source correlation indicates that coal-type gas in the Shiguhao zone displays distalsource accumulation. It was mainly derived from the coal-measure source rocks in the Upper Carboniferous Taiyuan Formation (C 3 t) and Lower Permian Shanxi Formation (P 1 s), probably with a minor contribution from P 1 s coal measures from in situ Shiguhao zone. Natural gas in the Shilijiahan and Gongkahan zones mainly displays near-source accumulation. The coal-type gas component was derived from in situ C 3 t-P 1 s source rocks, whereas the oil-type gas component might be derived from the carbonate rocks in the Lower Ordovician Majiagou Formation (O 1 m).

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Section: Source Of Tight Gasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic Types and Source of the Upper Paleozoic Tight Gas in the Hangjinqi Area, Northern Ordos Basin, China

Liu

et al. 2017

Geofluids

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“…In recent years, hydrocarbon exploration and exploitation have proved that the Ordos Basin in Central China possesses huge potential as a natural gas resource, and the natural gas in the Upper Palaeozoic strata has been an important exploration target (Feng, Liu, Huang, Gong, & Peng, ; Yang, Fu, Liu, & Meng, ). A number of Upper Palaeozoic natural gas reservoirs have been discovered, such as the Sulige, Yulin, Daniudi, Wushenqi, and Shenmu gas fields, containing the proven reserves >100 × 10 9 m 3 (Dai et al, ; Hu, Li, Shan, & Han, ; Huang, Fang, Liu, Fang, & Huang, ; Yang, Fu, Wei, & Liu, ; Zou et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…A number of Upper Palaeozoic natural gas reservoirs have been discovered, such as the Sulige, Yulin, Daniudi, Wushenqi, and Shenmu gas fields, containing the proven reserves >100 × 10 9 m 3 (Dai et al, ; Hu, Li, Shan, & Han, ; Huang, Fang, Liu, Fang, & Huang, ; Yang, Fu, Wei, & Liu, ; Zou et al, ). The origin and source of the natural gas in these large gas fields have been much investigated, and the underlying Carboniferous–Permian coal measure source rocks were generally considered as the main source rocks for the Upper Palaeozoic gas reservoirs (Dai et al, ; Hu et al, ; Hu, Li, Zhang, & Li, ; Yang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Genesis and accumulation of natural gas in the Upper Palaeozoic strata of north‐eastern Ordos Basin, China

et al. 2018

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The north‐eastern Ordos Basin in Central China has become an exploration target in recent years due to the potential of natural gas resources in the Upper Palaeozoic strata. In this study, by analysing the geochemical characteristics of the source rocks and the natural gas, the genesis of the Upper Palaeozoic natural gas was identified. In addition, the accumulation process was discussed by combining studies of hydrocarbon generation and burial/thermal history. The results reveal three sets of source rocks developed in the study area—Carboniferous Benxi (C2b), Permian Taiyuan (P1t), and Shanxi (P1s) formations—consisting of mudstones, carbonaceous mudstones, and coals. The source rocks contain abundant Type III organic matter and have entered mature to high‐mature stage, while source rocks in the south‐eastern part of the study area have entered the overmature stage due to the activity of Zijinshan magmatic rocks. The natural gas has a high content of methane (average 93.99%). The stable carbon isotope of methane (δ13C1) value (average −37.05‰) and that of ethane (δ13C2) value (average −26.4‰) and the composition of the light hydrocarbons reflect the idea that the natural gas is organic in origin, thermogenic, and mainly terrigenous‐sourced. The evolution of a transitional to continental depositional environment of the source rocks results in the variation in the geochemical characteristics of the Upper Palaeozoic gas in the study area. Analysis of fluid inclusions indicates a long and continuous period of natural gas charging in the study area from 165 to 65 Ma. Sandstone bodies close to or interbedded with the source rocks made the gas charging from the source rocks to the reservoirs over a short distance with high efficiency, while faults and fractures provided paths for the gas migrating to reservoirs vertically far from the source rocks. The huge gas generation potential of the source rocks and continuous distribution pattern of sandstone bodies provides favourable conditions for the development of a large‐scale natural gas reservoir.

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“…However, compared with conventional gas reservoirs, tight-sand gas reservoirs have unique characteristics in terms of their gas accumulation mechanism, and the conditions for reservoir formation are uncommon and require a specific set of geological factors. Tight-sand gas displays such geological characteristics as a gas-water inversion, an unclear gas-water contact and low gas saturation (Law and Dickinson, 1985;Wan, 1993;Zhang et al, 2000;Wang, 2002;Pang et al, 2003;Hu, 2009;Guo et al, 2011;Ma et al, 2012;Yang et al, 2012;Hu et al, 2013). These phenomena reflect the complexities of the tight-sand gas reservoir-forming mechanisms and the gas accumulation process.…”

Section: Introductionmentioning

confidence: 99%

Critical conditions for natural gas charging and delineation of effective gas source rocks for tight sandstone reservoirs

et al. 2014

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Although it has been shown that the potential of tight‐sand gas resources is large, the research into the mechanisms of hydrocarbon charging of tight sandstone reservoirs has been relatively sparse. Researchers have found that there is a force balance during hydrocarbon charging, but discriminant models still have not been established. Based on the force balance conditions observed during gas migration from source rocks to tight sandstone reservoirs, a calculation formula was established. A formula for identifying effective source rocks was developed with the gas expulsion intensity as the discrimination parameter. The critical gas expulsion intensity under conditions of various burial depths, temperatures, and pressures can be obtained using the calculation formula. This method was applied in the Jurassic tight sandstone reservoirs of the eastern Kuqa Depression, Tarim Basin, and it was calculated that the critical expulsion intensity range from 6.05 × 108 m3/km2 to 10.07 × 108 m3/km2. The critical gas charging force first increases with depth and later decreases with greater depths. The distribution range of effective gas source rocks and total expelled gas volume can be determined based on this threshold. This method provides new insight into and method for predicting favourable tight‐sand gas‐bearing regions and estimating their resource potentials. Copyright © 2014 John Wiley & Sons, Ltd.

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Accumulation conditions and exploration and development of tight gas in the Upper Paleozoic of the Ordos Basin

Cited by 140 publications

References 4 publications

Genetic Types and Source of the Upper Paleozoic Tight Gas in the Hangjinqi Area, Northern Ordos Basin, China

Genetic Types and Source of the Upper Paleozoic Tight Gas in the Hangjinqi Area, Northern Ordos Basin, China

Genesis and accumulation of natural gas in the Upper Palaeozoic strata of north‐eastern Ordos Basin, China

Critical conditions for natural gas charging and delineation of effective gas source rocks for tight sandstone reservoirs

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