琼东南盆地古近纪成煤沉积体系类型及特征

doi:10.11743/ogg20190114

Abstract

Abstract:

The practice for exploring natural gas in Qiongdongnan Basin proves that coal measures and coal seams are the most important hydrocarbon source rocks.Based on the characteristic analysis of coal-bearing deposits in the Oligocene Paleogene by the seismic data,drilling core and logging data in Qiongdongnan Basin,the corresponding relationships between sedimentary facies and seismic facies are established,and 14 kinds of sedimentary assemblages are identified in the Oligocene of Qiongdongnan Basin,including the alluvial fan-tidal flat-lagoon,alluvial fan-tidal flat-coast,alluvial fan-sea bog sand ridge plain-coast assemblages.According to the micro-and macro-physicochemical properties of cored coal intervals,it is made certain that the Yacheng Formation coal seam was affected by seawater during its formative process and its sedimentary environment tended to be strong in reduction,indicating that the coal seam is developed in the offshore marsh environment.In view of the characteristic and environmental analysis for coal forming,four types of coal-forming sedimentary systems were classified,namely fan delta,braided river delta,tidal flat-lagoon and barrier-coast-sea marsh sand ridge plain systems.Among them,the thin coal seam in the fan delta system,prone to bifurcation,is mainly developed in the fan delta plains,abandoned lobes,and interlobe depressions;the coal seam in the braided river delta system,featuring thinness and instability,mainly grows in the braided river delta plains,diversion bays,and floodplains.The coal seam in the tidal-lagoon system is mostly developed in the swamps of the supratidal flats and the inter-tidal-channel bays of the upper intertidal flats,the tidal delta plains and the silted lagoons,and in areas of multiple tidal channels,the coal seam layers are relatively large in number,and characterized by thinness and larger spacing, while in areas of single tidal channels, the number of coal-bearing seams,complex in structure,is relatively small,but their thickness is relatively large,and their spacing is small.At last, the coal seam in the barrier coast-sea marsh sand plain system is mainly developed in coastal plain marsh areas,characterized by multiple layers and faster change in lateral,but thinness for each layer.

Key words: sedimentation assemblage, coal-forming depositional system, Yacheng Formation, Oligocene, Qiongdongnan Basin

CLC Number:

TE121.3

Liu Ying, Liu Haiyan, Yang Haizhang, Wang Dongdong, Song Guangzeng, Lyu Dawei, Chen Ying, Li Zengxue. Types and characteristics of Paleogene coal-forming sedimentary systems in Qiongdongnan Basin[J]. Oil & Gas Geology, 2019, 40(1): 142-151.

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Types and characteristics of Paleogene coal-forming sedimentary systems in Qiongdongnan Basin

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