Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western China
Large-scale gas accumulation areas in large oil-gas basins in central and Western China have multiple special accumulation mechanisms and different accumulation effects. Based on the geological theory and method of natural gas reservoir formation, this study examined the regional geological and stru...
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doaj-929a5a1de1ef44aca3c524089bc1dbf62021-04-02T12:19:55ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042020-08-01474714725Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western ChinaWei LI0Xueke WANG1Benjian ZHANG2Zhuxin CHEN3Senqi PEI4Zhichao YU5PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; Corresponding authorPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaChina Northwest Sichuan Gas Mine of Southwest Oil and Gas Field Company, PetroChina, Sichuan 621700, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaChina Northwest Sichuan Gas Mine of Southwest Oil and Gas Field Company, PetroChina, Sichuan 621700, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaLarge-scale gas accumulation areas in large oil-gas basins in central and Western China have multiple special accumulation mechanisms and different accumulation effects. Based on the geological theory and method of natural gas reservoir formation, this study examined the regional geological and structural background, formation burial evolution, basic characteristics of gas reservoirs, and fluid geology and geochemistry of typical petroliferous basins. The results show that the geological processes such as structural pumping, mudstone water absorption, water-soluble gas degasification and fluid sequestration caused by uplift and denudation since Himalayan stage all can form large-scale gas accumulation and different geological effects of gas accumulation. For example, the large-scale structural pumping effect and fluid sequestration effect are conducive to the occurrence of regional ultra-high pressure fluid and the formation of large-scale ultra-high pressure gas field; mudstone water absorption effect in the formation with low thickness ratio of sandstone to formation is conducive to the development of regional low-pressure and water free gas reservoir; the water-soluble gas degasification effect in large-scale thick sandstone can not only form large-scale natural gas accumulation; moreover, the degasification of water-soluble gas produced by the lateral migration of formation water will produce regional and regular isotopic fractionation effect of natural gas, that is, the farther the migration distance of water-soluble gas is, the heavier the carbon isotopic composition of methane formed by the accumulation.http://www.sciencedirect.com/science/article/pii/S1876380420600878Central and Western China basinslarge-scale natural gas accumulation mechanismstructural pumping effectmudstone water absorption effectwater-soluble gas degasification effectfluid sequestration effect |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Wei LI Xueke WANG Benjian ZHANG Zhuxin CHEN Senqi PEI Zhichao YU |
spellingShingle |
Wei LI Xueke WANG Benjian ZHANG Zhuxin CHEN Senqi PEI Zhichao YU Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western China Petroleum Exploration and Development Central and Western China basins large-scale natural gas accumulation mechanism structural pumping effect mudstone water absorption effect water-soluble gas degasification effect fluid sequestration effect |
author_facet |
Wei LI Xueke WANG Benjian ZHANG Zhuxin CHEN Senqi PEI Zhichao YU |
author_sort |
Wei LI |
title |
Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western China |
title_short |
Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western China |
title_full |
Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western China |
title_fullStr |
Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western China |
title_full_unstemmed |
Large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of Central and Western China |
title_sort |
large-scale gas accumulation mechanisms and reservoir-forming geological effects in sandstones of central and western china |
publisher |
KeAi Communications Co., Ltd. |
series |
Petroleum Exploration and Development |
issn |
1876-3804 |
publishDate |
2020-08-01 |
description |
Large-scale gas accumulation areas in large oil-gas basins in central and Western China have multiple special accumulation mechanisms and different accumulation effects. Based on the geological theory and method of natural gas reservoir formation, this study examined the regional geological and structural background, formation burial evolution, basic characteristics of gas reservoirs, and fluid geology and geochemistry of typical petroliferous basins. The results show that the geological processes such as structural pumping, mudstone water absorption, water-soluble gas degasification and fluid sequestration caused by uplift and denudation since Himalayan stage all can form large-scale gas accumulation and different geological effects of gas accumulation. For example, the large-scale structural pumping effect and fluid sequestration effect are conducive to the occurrence of regional ultra-high pressure fluid and the formation of large-scale ultra-high pressure gas field; mudstone water absorption effect in the formation with low thickness ratio of sandstone to formation is conducive to the development of regional low-pressure and water free gas reservoir; the water-soluble gas degasification effect in large-scale thick sandstone can not only form large-scale natural gas accumulation; moreover, the degasification of water-soluble gas produced by the lateral migration of formation water will produce regional and regular isotopic fractionation effect of natural gas, that is, the farther the migration distance of water-soluble gas is, the heavier the carbon isotopic composition of methane formed by the accumulation. |
topic |
Central and Western China basins large-scale natural gas accumulation mechanism structural pumping effect mudstone water absorption effect water-soluble gas degasification effect fluid sequestration effect |
url |
http://www.sciencedirect.com/science/article/pii/S1876380420600878 |
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