Abstract Organic reefs are favourable accumulation spaces for hydrocarbons and various mineral resources. A complete Permian organic reef pro?le about 44 m thick with distribution area no more than 1 km2 is exposed near Lengwu, Tonglu, Zhejiang Province. Examination of outcrops and thin sections revealed that the main reef-building organisms are calcisponges, with inozoans as dominant type. Five types of rocks have been recognized in the reef, and they are calcisponge framestone, calcisponge baf?estone, bindstone, rudstone and bioclastic wackestone. The pro?le was constructed in three reef-building stages. The thickness of the second stage is largest, followed by the ?rst stage and the third stage is smallest. Each stage started with a framestone or baf?estone, ended as the reef grew near the sea-level, and died because of in?ux of terrigenous sediments. The development of the Lengwu reef is controlled by biological factors and sea-level changes. Based on the study a reef sedimentary model is established.
Cai, H.P., 2009. Study on Reef Flat Facies Reservoir Integrated Prediction �� A Case Study of Changxing Formation in the SYB Area. Master Thesis. Chengdu University of Technology, 1.
[2]
Chen, J.G., Zhao, X.W., Zhang, Y.B., 1985. Distribution of the reef in Changxing Formation of Upper Permian in Sichuan Basin and its relation to oil and gas. Gas Industry, 5(2), 10�C18.
[3]
Fan, J.S., 1982. Basic features and developing regularity of Permian reefs in western Hubei. Geology, 3, 274�C282.
[4]
Fan, J.S., Zhang, W., 1987. The Upper Permian reefs in Lichuan district west Hubei. Scientia Geological Sinica, 4, 326�C333.
[5]
Fan, J.S., 1996. Chinese Reef and Petroleum. Petroleum Industry Press, Beijing, 1.
[6]
Fan, J.S., Qi, J.W., 1990. The Permian Organic Reefs, Longlin County Guangxi Province. Geological Publishing House, Beijing, pp. 61�C79.
[7]
Feng, Z.Z., Yang, Y.Q., Jin, Z.K., 1996. Lithofacies paleogeography of the Permian of South China. Acta Sedimentologica Sinica, 14(2), 1�C11 (in Chinese with English abstract).
[8]
Heckel, P.H., 1974. Carbonate buildups in the geologic record: a review. In: Laporte, L.F. (Ed.), Reefs in Time and Space, SEPM Special Publications, Tulsa 18, pp. 90�C155.
[9]
James, N.P., Wray, J.L., Ginsburg, R.N., 1984. Calci?cation of encrusting aragonitic algae-implications for origin of late Paleozoic reefs and cements. AAPG Bulletin, 68(4), 491�C491.
[10]
Kiessling, W., Flugel, E., Golonka, J., 1999. Paleoreef maps: evaluation of a comprehensive database on Phanerozoic reefs. AAPG Bulletin, 83(10), 1552�C1587.
[11]
Liu, Y., 2007. Research on Sedimentary Facies and Reservoir Characteristics of Upper Ordovician Complexed Reef-beach in 82 Well Area of the Tazhong First Break in Slope. Master Thesis. Southwest Petroleum University, 1.
[12]
Liu, C.Y., Lin, C.S., Wu, M.B., 2007. Characteristics of spatiotemporal distributions of reefs in China and their geological signi?cance. Global Geology, 26(1), 44�C51.
[13]
Lu, Y.Q., Gong, Y.M., 2007. On reefs in association with marine oil?elds: actuality, problems and prospects. Earth Science �� Journal of China University of Geosciences, 32(6), 871�C878.
[14]
Michel, T., Halbouty, A.A., Meyerhoff, King, Robert E., et al., 1970. World's giant oil and gas ?elds, geologic factors affecting their formation, and basin classi?cation. Pt. 1. Giant Oil and Gas Fields. AAPG Memoir, 14, 502�C528.
[15]
Qiang, Z.T., Guo, Y.H., Zhang, F., 1985. The Upper Permian reef and its diagenesis in Sichuan Basin. Oil & Gas Geology, 6(1), 82�C90.
[16]
Song, H.Y., 2012. The Changes in Porosity and Permeability Layer and Genetic Characteristics of the Neogene Biohermal Carbonates in the Western of the South China Sea. Master Thesis. Ocean University of China.
[17]
Sun, S.Q., Esteban, M., 1994. Paleoclimatic controls on sedimentation diagenesis and reservoir quality: lessons from Miocene carbonates. AAPG Bulletin, 78, 519�C543.
[18]
Wang, W.Y., 1987. Principal features of Permian reef in Lengwu Area, Zhejiang Province. Experimental Petroleum Geology, 9(4), 299�C304.
[19]
Wang, Y.B., Xu, G.R., Zhang, K.X., 1998. Status and new advances in the studies of Permian reefs in China. Geological Science and Technology Information, 17(1), 35�C39.
[20]
Webb, G.E., 1996. Was Phanerozoic reef history controlled by the distribution of non-enzymatically secreted reef carbonates (microbial carbonates and biologically induced cement)? Sedimentology, 43, 947�C971.
[21]
Wood, R., 1995. The changing biology of reef-building. Palaios, 10, 517�C529.
[22]
Wood, R., Dickson, J.A.D., Kirkland-George, B., 1994. Turning the Capitan Reef upside down: A new appraisal of the ecology of the Permian Capitan Reef, Guadalupe Mountains, Texas and New Mexico. Palaios 9 (4), 422�C427.
[23]
Wu, Y.S., 1992. Structural rock type and structure phase of the reef. Science in China (Series B), 3, 304�C310.
[24]
Wu, Y.S., 1998. Development mode of Permian reef, Lengwu, Tonglu. Marine and Petroleum Geology, 3(2), 11�C15.
[25]
Xu, H., 1992. Comparative study of organic reef in oil-gas-bearing basin of China seas and adjacent areas. Marine Geology & Quaternary Geology, 12(4), 41�C45.
Yang, W.R., 1995. The sedimentary and diagenesis environments of Permian calcisponge mound in Tonglu, Zhejiang. Journal of Stratigraphy, 19(3), 191�C198.
[28]
Yang, W.R., Li, X., 1995. Permian reef type sand controlling factors of reef formation South China. Acta Palaeontologica Sinica, 34(1), 67�C75.
[29]
Yang, X.L., Shen, A.J., Chen, Z.D., 2002. Genetic types for petroliferous system of organic reefs in the Permian system of South China. Acta Petrolei Sinica, 23(3), 6�C10.
[30]
Zhong, J.H., Wen, Z.F., Li, Y., 2005. Organic reefs study: concept, classi?cation, characteristics, history and development. Geological Review, 51(3), 288�C300.
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