| From deep basin gas to diagenetic trap—An example from the Yulin Gas Field in the Ordos Basin |
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| 作者姓名： | ZHANG LiuPing LUO XiaoRong MA XinHua CHEN MengJin WU MingHui |
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| 作者单位： | [1]Key Laboratory of Petroleum Resource, Chinese Academy of Sciences, Beijing 100029, China [2]Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China |
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| 基金项目： | Supported by China National Basic Science ＂973＂ Project （Grant No. 2003CB214608） and the Research Institute of Petroleum Exploration and Development, PetroChina |
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| 摘 要： | In the updip portion of the Yulin Gas Field in the Ordos Basin, there are no any structural, stratigraphic and sedimentary lithologic seals. Using thin-section petrography, ultraviolet fluorescence microscopy, micro-thermometry and Raman microspectrometry, this paper finds out the diagenetic trap and studies the diagenetic history of this field. It was revealed that three phases of diagenesis and hydrocarbon charging happened in late Triassic, late Jurassic and the end of early Cretaceous respectively. In the first two phases, acid geofluid entered the reservoir and caused dissolution and cementation. Although the porosities had been increased, further compaction accompanying re-subsidence resulted in tight sandstone and conglomerates. Till the end of the early Cretaceous, bulk of gas migrated into the tight reservoir. Cementation, however, kept on in the updip portion of this field due to low gas saturation and formed the diagenetic trap. The mechanism for gas accumulation was changed from deep basin gas to diagenetic trap, which offers a sealing condition that can retain gas for much longer time.
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| 关 键 词： | 天然气 气田 储气量 天然气开发 |
| 收稿时间： | 15 February 2006 |
| 修稿时间： | 2006-02-15 |
From deep basin gas to diagenetic trap—An example from the Yulin Gas Field in the Ordos Basin |
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| ZHANG LiuPing LUO XiaoRong MA XinHua CHEN MengJin WU MingHui.From deep basin gas to diagenetic trap—An example from the Yulin Gas Field in the Ordos Basin[J].Chinese Science Bulletin,2007,52(21):2973-2983. |
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| Authors: | Zhang LiuPing Luo XiaoRong Ma XinHua Chen MengJin Wu MingHui |
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| Institution: | (1) Key Laboratory of Petroleum Resource, Chinese Academy of Sciences, Beijing, 100029, China;(2) Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China |
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| Abstract: | In the updip portion of the Yulin Gas Field in the Ordos Basin, there are no any structural, stratigraphic and sedimentary lithologic seals. Using thin-section petrography, ultraviolet fluorescence microscopy, micro-thermometry and Raman microspectrometry, this paper finds out the diagenetic trap and studies the diagenetic history of this field. It was revealed that three phases of diagenesis and hydrocarbon charging happened in late Triassic, late Jurassic and the end of early Cretaceous respectively. In the first two phases, acid geofluid entered the reservoir and caused dissolution and cementation. Although the porosities had been increased, further compaction accompanying re-subsidence resulted in tight sandstone and conglomerates. Till the end of the early Cretaceous, bulk of gas migrated into the tight reservoir. Cementation, however, kept on in the updip portion of this field due to low gas saturation and formed the diagenetic trap. The mechanism for gas accumulation was changed from deep basin gas to diagenetic trap, which offers a sealing condition that can retain gas for much longer time. |
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| Keywords: | natural gas deep basin gas tight reservoir diagenetic trap Ordos Basin |
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