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0 20230419 - 20230419

DOI: https://doi.org/10.11698/PED.20220629

Hydrocarbon accumulation characteristics and exploration direction of Termit superimposed marine-continental rift basin, Niger

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  • 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China

Received date: 2022-09-13

  Revised date: 2023-02-07

  Online published: 2023-02-21

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Abstract

Based on the seismic and drilling data, casting thin sections, geochemical analysis of oil and rock samples, and hydrocarbon generation history simulation, the hydrocarbon accumulation characteristics and exploration direction of Termit superimposed marine-continental rift basin are discussed. Different from other basins in the West and Central African rift system (WCARS), which mostly develop three-phase rifts, the Termit basin is superimposed with two-phase rifts (Early Cretaceous and Paleogene). The subsidence curves of two wells on the Trakes slope in the east of the basin show high subsidence rate in the Late Cretaceous, which is believed to be high deposition rate as a result of transgression. The depositional sequences in the Termit basin were controlled by the Late Cretaceous marine transgression cycle and the Paleogene lacustrine transgression cycle, giving rise to two types of superimposed marine-continental “source-sink” deposits. The marine and continental mixed source rocks developed universally in the marine transgression period cover the whole basin, and are overlaid by the Paleogene Sokor 1 reservoir rocks and Sokor 2 caprocks developed in the lacustrine transgression period, forming the unique superimposed marine-continental basin in WCARS. The early low geothermal gradient of the Termit basin resulted in the late hydrocarbon generation of the Upper Cretaceous Yogou source rocks. Mature Upper Cretaceous Donga source rocks were found in the Trakes slope; coupling with the feature that the Paleogene strike-slip faults controlled the trap development and enhanced the hydrocarbon migration, the double-source hydrocarbon accumulation model is proposed for the Trakes slope, which has supported the massive oil discoveries in this area. By virtue of the newly proposed hydrocarbon accumulation model for the Termit superimposed marine-continental rift basin and the exploration activities, an additional effective exploration area of about 2500 km2 has been confirmed in the east of the basin. It is believed that Sokor 1, Donga and Upper Cretaceous lithologic traps in the southeast of the basin have exploration potentials, and they are key expected targets for future exploration and frontier evaluation.

Key words： Niger; Termit basin; superimposed marine-continental rift; Upper Cretaceous Donga Formation; Paleogene Sokor 1 Formation; tectonic evolution; source-sink; hydrocarbon accumulation; exploration direction

Cite this article

YUAN Shengqiang, DOU Lirong, CHENG Dingsheng, MAO Fengjun, PAN Chunfu, ZHENG Fengyun, JIANG Hong, Pang Wenzhu, LI Zaohong . Hydrocarbon accumulation characteristics and exploration direction of Termit superimposed marine-continental rift basin, Niger[J]. Petroleum Exploration and Development, 0 : 20230419 -20230419 . DOI: 10.11698/PED.20220629

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