Cenozoic sedimentary systems in Zengmu Basin, South China Sea

Abstract

Abstract: The Zengmu Basin is a large gas field with trillion-m3 scale gas reserves. Its sedimentary systems have not been systematically studied. There is a controversy about whether the basin was deposited in a continental environment or a marine environment during the early stage. In order to clarify the characteristics of sedimentary systems and to provide the reliable basis for the future oil and gas exploration in the Zengmu Basin, the previous research results were reviewed. Then, the Cenozoic sedimentary systems were analyzed using outcrops, wells, seismic and sedimentary facies data, as well as the regional tectonic evolution, material source characteristics and lithofacies paleogeographic background. As a result, 7 types of Cenozoic sedimentary facies were identified, including fluvial, delta, coastal plain, carbonate platform (organic reef), littoral, neritic and bathyal facies. It was the marine environment all over the basin during the Cenozoic. Large delta was constantly developed in the south of the basin, and the carbonate platform (organic reef) and bathyal facies deposits were mainly developed during the depression stage (the Middle Miocene-Quaternary), but seldom developed during the faulted depression stage (the Oligocene-Early Miocene). The provenance of the Zengmu Basin changed as a result of the counterclockwise rotation of Borneo during the Middle Miocene. The sources mainly came from the southwest during the faulted depression stage and from the southeast during the depression stage.

Guo Jia, Xie Xiaojun, Liu Shixiang, Wang Yibo, Song Shuang, Hu Wenbo, Wang Long, Liao Jihua. Cenozoic sedimentary systems in Zengmu Basin, South China Sea[J]. China Petroleum Exploration, 2016, 21(4): 99-107.

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