琼东南盆地古近纪泥炭沼泽破坏与重建作用对煤型源岩物质形成的控制

doi:10.11743/ogg20220603

Abstract

Abstract:

Coal systems and coal seams have been widely valued as an important type of hydrocarbon source rocks for oil and gas reservoirs. Taking the Qiongdongnan Basin of the South China Sea as an example， this study analyzes the genetic relationship between the destruction and reconstruction of peat swamps and terrigenous marine hydrocarbon source rocks， and summarizes the characteristics of the peat swamp destruction as well as the formation and accumulation of peat substances. It is suggested that storms are one of the main dynamic factors for the formation of different land coal and terrigenous marine hydrocarbon source rocks， and this leads to the proposition of a sedimentation mode for the peat storm in the edge of the South China Sea Basin. The results have shown that an unstable and complex interactive relationship exists between the destruction and reconstruction of peat swamps and the formation， decentralization and aggregation of peat substances. The destruction caused a full or partial decomposition and transportation of the peat substances， while the rebuilding restored the development of peat swamps under the suitable climatic conditions. Storms is behind all these destruction and long-distance transportation of peat substance in the swamps in the Cenozoic basins， South China Sea. With storms violently invading and disturbing the coastal peat swamps， large amount of peat clasts were rooted up and carried away by seawater， transported along with storm gravity flow and turbidity flow， and eventually deposited within source rocks as terrigenous marine organic matter.

Key words: peat swamp destruction, coal-system source-sink system, storm, near-source deposition, terrigenous marine hydrocarbon source rocks, Qiongdongnan Basin

CLC Number:

TE122.1

Zengxue Li, Ying Liu, Xiaojing Li, Gongcheng Zhang, Rui Sun, Dongdong Wang, Lusheng Yin, Jiamin Liu. The control of Paleogene peat swamp destruction and reconstruction on the formation of coal-type source material in the Qiongdongnan Basin[J]. Oil & Gas Geology, 2022, 43(6): 1309-1320.

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煤层			陆源有机质
分级	厚度/m	评价结果	占总有机质比例/%	评价结果
煤线	<0.3	成煤不好	边界值<40	不好
极薄煤层	0.3～0.5
薄煤层	0.5～1.3
中厚煤层	1.3～3.5	成煤好	边界值>40	好
厚煤层	3.5～8.0
巨厚煤层	>8.0

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The control of Paleogene peat swamp destruction and reconstruction on the formation of coal-type source material in the Qiongdongnan Basin

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