湘西沅麻盆地印支期以来古流体特征及其对寒武系页岩气勘探方向的指示

刘安; 蔡全升; 陈孝红; 李海; 苗凤彬; 彭中勤

doi:10.3799/dqkx.2021.004

Volume 46 Issue 10

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(10): 3615-3628

Liu An, Cai Quansheng, Chen Xiaohong, Li Hai, Miao Fengbin, Peng Zhongqin, 2021. Paleofluid Characteristics since Indosinian Movement in Yuanma Basin, West Hunan: Significance for Cambrian Shale Gas Exploration. Earth Science, 46(10): 3615-3628. doi: 10.3799/dqkx.2021.004

Citation:

Liu An, Cai Quansheng, Chen Xiaohong, Li Hai, Miao Fengbin, Peng Zhongqin, 2021. Paleofluid Characteristics since Indosinian Movement in Yuanma Basin, West Hunan: Significance for Cambrian Shale Gas Exploration. Earth Science, 46(10): 3615-3628. doi: 10.3799/dqkx.2021.004

Citation:

Liu An, Cai Quansheng, Chen Xiaohong, Li Hai, Miao Fengbin, Peng Zhongqin, 2021. Paleofluid Characteristics since Indosinian Movement in Yuanma Basin, West Hunan: Significance for Cambrian Shale Gas Exploration. Earth Science, 46(10): 3615-3628. doi: 10.3799/dqkx.2021.004

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Paleofluid Characteristics since Indosinian Movement in Yuanma Basin, West Hunan: Significance for Cambrian Shale Gas Exploration

doi: 10.3799/dqkx.2021.004

Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China

Received Date: 2020-04-08
Available Online: 2021-11-03
Publish Date: 2021-11-03

Abstract

Abstract

Paleo-uplifts with late hydrocarbon generation and relatively low maturity of source rock have become important targets for petroleum exploration in the Middle Yangtze region. Xuefeng uplift formed in Late Caledonian, covered by Cretaceous strata, has no clear exploration directions because of complex tectono-sedimentary evolution. In this paper, it focuses on the north part of Yuanma basin located in the north margin of Xuefeng paleo-uplift, two types of calcite vein samples were collected from Cambrian shale and Cretaceous rocks near the unconformity between Cambrian and Cretaceous, in order to discuss the paleo-fluid environment, source, and its significance for hydrocarbon-generation evolution, by comprehensive analysis of geochemical data and inclusions. The following results were obtained. (1) Cretaceous veins with similar carbon and oxygen isotope value to surrounding rocks have no noticeable Eu abnormality of REE, different from strong Eu positive anomaly in Cambrian veins, indicating the source of veins was Cretaceous and little influenced by Cambrian shale. (2)Most inclusions in Cretaceous samples collected from structurally high position are aqueous inclusions, formed in weakly oxic to weakly reducing environment, with no bitumen or pure methane inclusions, indicating that the Cretaceous sediment was formed later than the time of large-scale hydrocarbon generation and expulsion of Cambrian shale. (3) Under the restrains of homogeneous temperature of fluid inclusions and Ro, two types burial history of Cambrian shale are proposed in Yuanma basin combined with regional geological characteristics. In Caotang depression, north of Yuanma basin, Cambrian shale has no secondary hydrocarbon generation due to deeply buried in early stage. However, the Chenxi depression in the south part may be a favorable area for shale gas exploration, where the Cambrian shale was shallow buried in early stage, and its Ro elevated form 1.2% to 2.5% in Cretacous buried stage leading to huge hydrocarbon potential.
- West Hunan Province,
- Yuanma basin,
- paleo-uplift,
- Cretaceous,
- Cambrian,
- paleofulid,
- secondary hydrocarbon generation,
- shale gas

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Paleofluid Characteristics since Indosinian Movement in Yuanma Basin, West Hunan: Significance for Cambrian Shale Gas Exploration

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