Abstract The deposition of the Liushagang Formation of Paleogene coincided with the main basin forming period of the Fushan Sag. During this period, the subsidence was rather significant and the surface relief was rather steep. As a result, the deposits of deep lacustrine and braided delta were well developed. Based on the comprehensive analyses of the core and the well logs and seismic data, the sedimentary facies of the Liushagang Formation have been studied. The individual well sedimentary facies and the plane sedimentary facies analyses indicate that the braided delta and lacustrine facies are two major sedimentary facies in the Liushagang Formation, which can be further subdivided into seven sub-facies and thirteen microfacies. During the deposition of the member 3 of the formation, the braided delta deposit was most developed, and it covered half of the study area. The semi-deep and deep lacustrine sub-facies were restricted to the northern part of the study area During the deposition of the member 2, the maximum lake transgression occurred in the Fushan Sag. The deep lacustrine facies was most developed so that the semi-deep and deep lacustrine sub-facies nearly occupied the entire northern half of the study area After this stage, the areas surrounding the sag uplifted greatly. Thus the sedimentary area of the member 1 of Liushagang Formation was much smaller than that of the member 2, but its pattern of sedimentary facies distribution was similar to that of the member 2. Based on the analyses of the isoline maps of ZTR index, the percentage of sandstones (and conglomerates) , and the distribution pattern of sedimentary facies, we conclude that the source of sediments are mainly from the Hainan Uplift, south part of the Fushan Sag. In addition, there are two secondary source areas that are located in the east and west.
About author: He Youbin, born in 1964, got his doctoral degree from University of Petroleum (Beijing) in 1992. Now he is a professor in Yangtze University, and is engaged in sedimentology. Email: heyoub@sohu.com
Cite this article:
He Youbin,Gao Zhenzhong. Sedimentary facies of the Liushagang Formation of Paleogene in Fushan Sag of Hainan Island[J]. JOPC, 2006, 8(3): 365-376.
He Youbin,Gao Zhenzhong. Sedimentary facies of the Liushagang Formation of Paleogene in Fushan Sag of Hainan Island[J]. JOPC, 2006, 8(3): 365-376.
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