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Characteristics of carbonate gas pool and multistage gas pool formation history of Hetianhe gas field, Tarim Basin, Northwest China

  • Published:
Chinese Science Bulletin

Abstract

Hetianhe is a big carbonate gas field which is found and demonstrated in the period of “Chinese National Ninth 5-Year Plan”. The proved reserve of Hetianhe gas field is over 600×108 m3. Its main producing layers are Carboniferous bioclastic limestone and Ordovician carbonate composed of buried hill. The former is stratified gas pool with water around its side, and the latter is massive gas pool with water in its bottom. The gases in the gas pools belong to dry gases with normal temperature and pressure systems. Based on the correlation of gas and source rock, the gases are mainly generated from Cambrian source rocks. According to the researches on source rock and structure evolution, and the observations on the thin section to reservoir bitumen and the studies on homogenization temperature of fluid inclusions, the gas pool has been identified and divided into three formation periods. The first is Late Caledonian when the oil generated from the Cambrian source rocks and migrated along faults, as a form of liquid facies into Ordovician carbonate reservoir and accumulated there. After that, the crust uplifted, the oil reservoir had been destroyed. The second is Late Hercynian when condensate gases generated from the Cambrian source rocks and migrated into Ordovician reservoir, as a form of liquid facies. Since the fractures had reached P strata, so the trap might have a real poor preservation condition, and the largescale gas pool formation had not happened. The third gas reservoir formation period occurred in Himalaya. The fractures on both sides of Hetianhe gas field developed violently under the forces of compression, and thus the present fault horst formed. The dry gases generated from Cambrian source rocks and migrated upwards as the form of gas facies into Ordovician and Carboniferous reservoirs, and the large gas pool as discovered at present was formed finally.

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Authors and Affiliations

  1. Tarim Oil Field, PetroChina, 841000, Korla, Xinjiang, China

    Xinyuan Zhou, Zhaoming Wang, Qinghua Wang & Wei Yang

  2. PetroChina, 100724, Beijing, China

    Chengzao Jia

Authors
  1. Xinyuan Zhou
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  2. Chengzao Jia
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  3. Zhaoming Wang
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  4. Qinghua Wang
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  5. Wei Yang
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Correspondence to Xinyuan Zhou.

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Zhou, X., Jia, C., Wang, Z. et al. Characteristics of carbonate gas pool and multistage gas pool formation history of Hetianhe gas field, Tarim Basin, Northwest China. Chin. Sci. Bull. 47 (Suppl 1), 146–152 (2002). https://doi.org/10.1007/BF02902831

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  • DOI: https://doi.org/10.1007/BF02902831

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