Formation condition and accumulation of Pliocene strata-trapped gas field L18 in the deepwater area of the Qiongdongnan Basin

Zhang Yingzhao; Xu Xinde; Gan Jun; Yang Xibing; Zhu Jitian; Yang Jinhai; He Xiaohu; Guo Xiaoxiao

doi:10.3969/j.issn.0253-4193.2019.03.012

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Zhang Yingzhao, Xu Xinde, Gan Jun, Yang Xibing, Zhu Jitian, Yang Jinhai, He Xiaohu, Guo Xiaoxiao. Formation condition and accumulation of Pliocene strata-trapped gas field L18 in the deepwater area of the Qiongdongnan Basin[J]. Haiyang Xuebao, 2019, 41(3): 121-133. doi: 10.3969/j.issn.0253-4193.2019.03.012

Citation:

Zhang Yingzhao, Xu Xinde, Gan Jun, Yang Xibing, Zhu Jitian, Yang Jinhai, He Xiaohu, Guo Xiaoxiao. Formation condition and accumulation of Pliocene strata-trapped gas field L18 in the deepwater area of the Qiongdongnan Basin[J]. Haiyang Xuebao, 2019, 41(3): 121-133. doi: 10.3969/j.issn.0253-4193.2019.03.012

Citation:

Zhang Yingzhao, Xu Xinde, Gan Jun, Yang Xibing, Zhu Jitian, Yang Jinhai, He Xiaohu, Guo Xiaoxiao. Formation condition and accumulation of Pliocene strata-trapped gas field L18 in the deepwater area of the Qiongdongnan Basin[J]. Haiyang Xuebao, 2019, 41(3): 121-133. doi: 10.3969/j.issn.0253-4193.2019.03.012

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Formation condition and accumulation of Pliocene strata-trapped gas field L18 in the deepwater area of the Qiongdongnan Basin

doi: 10.3969/j.issn.0253-4193.2019.03.012

1. Research Institute, Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, China

Received Date: 2018-08-06
Rev Recd Date: 2018-12-13

Abstract

Abstract

The Pliocene strata-trapped gas field L18 has been discovered recently in the ultra-deepwater area of the Qiongdongnan Basin.There are considerable debates regarding what the accumulation background is and how the source rock developed and the reservoir deposited and what the gas migration pathway and the gas accumulation model are in the gas field L18. Our integrate study reveals that besides developing strata-trap within axial paleo-groove where the natural gas accumulated Pliocene, the formation conditions of the gas field L18 are required to develop the mature marine source rock in the Oligocene Yacheng Formation and the axial confined gravity flow sandstone reservoirs Pliocene, as well as the fault migration pathway in the Oligocene and Miocene in the eastern Lingshui Sag. Our comprehensive research on accumulation model show that the sandstone reservoirs that deposited in the axial confined paleo-groove, and their tops fluctuated due to the later depositional migration and the differential compaction, and are sealed by the adjacent abyssal mudstone deposits, formed the stratigraphic traps of the Pliocene Yinggehai Formation.The mature natural gas has been generated from the marine source rock in the Oligocene Yacheng Formation in the eastern Linshui Sag since 3.4 Ma BP, migrated upward to the sandstone reservoirs in the Yinggehai Formation, then moved laterally into the strata-trapped area and accumulated. The source rock, the valid trap and the migration pathway composing of faults and sandstones together contributed to the natural gas accumulation in the gas field L18.
- strata-trapped gas field,
- formation condition,
- accumulation model,
- Pliocene,
- deepwater area,
- Qiongdongnan Basin

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References(28)

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