南海北部深水区古近系沉积体系的东西差异及对烃源岩分布的影响

doi:10.11743/ogg20200513

Abstract

Abstract:

The striking discrepancy of oil-gas exploration results in deep waters of the Pearl River Mouth and Qiongdongnan Basins in northern South China Sea is rarely interpreted in terms of formation mechanism.With a view to objectively assessing the resource potential of the deep waters off the northern South China Sea, the study analyzes the conditions for basin formation and hydrocarbon generation based on the essential geological factors such as the basinal structure, provenance and sedimentation and charging, with the focus on the main sedimentary characteristics of the hydrocarbon source rock development during the Paleogene, and on the distribution patterns of the source rocks.The two basins are significantly different in terms of their Early Oligocene sedimentary systems, which may be traced back to the different basinal structures and provenances at that time.The major pay source rocks of the deep waters off the northern South China Sea were developed during the Early Oligocene, when the deep-water zone of the Pearl River Mouth Basin was filled with rifts and depressions, and the Baiyun and Liwan Sags in it had their respective depocenters and subsidence centers receiving sediments from surrounding uplift zones and the paleo-Pearl River system outside the basin and developing large delta systems of bay facies.Meanwhile, the deep waters of the Qiongdongnan Basin were a faulted depression with multiple rows of separated small sag groups developed on the terrace of both sides and the central lowlands of the basin.These sag groups subsequently formed barrier-coast systems and small-scale deltas in receiving short-range provenances from waters off the southern Hainan Island and Thu Bon river in Vietnam in a closed-semi-closed bay setting.In all, the sedimentary systems control the types and distribution patterns of the source rocks in the basins, so it is of great significance to the discussion of the distribution patterns and favorable zones of source rocks in the deep waters off the two basins from the perspective of the differences in sedimentary system architecture.

Key words: marine-to-continental facies, source rock, delta-bay system, provenance, basinal structure, sedimentary system, Paleogene, deep waters off the northern South China Sea

CLC Number:

TE121.3

Ying Chen, Yinxue Han, Lizeng Bian, Qingbo Zeng, Shuai Guo, Mo Ji, Dongsheng Yang, Longying Wang. Difference between eastern and western Paleogene sedimentary systems in deep waters off the northern South China Sea continental margin and its effect on source rock distribution[J]. Oil & Gas Geology, 2020, 41(5): 1028-1037.

Figures/Tables 6

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Difference between eastern and western Paleogene sedimentary systems in deep waters off the northern South China Sea continental margin and its effect on source rock distribution

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