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| Tarim Basin Middle-upper Ordovician Carbonate Strata Sequence Framework and Its Control of Reef Beach Body |
| WANG Enhui1,2 |
| 1. Liaohe Oilfield Company, PetroChina, Panjin 124010, Liaoning Province, China;2. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China |
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Abstract: Based on the outcrop and drilling data, using the sequence stratigraphy, biostratigraphy and sedimentary theory, the Tarim Basin middle-upper Ordovician carbonate strata sequence framework and the relations between the sequence and the reef-shoal development are established. It is shown that the middle-upper Ordovician develops 5 third-grade sequences. The 3 third-order sequences of Lianglitage Formation in Tazhong area can be further divided into 7 fourth-order sequences, and the middle-upper Lianglitage Formation in Tazhong area and the Sangtamu Formation in Tabei area are contemporaneous heterotopic facies, so the Lianglitage Formation in Tazhong and Tabei is obviously a diachronism stratigraphic unit. The Liangligeta Formation in Tazhong area develops 5 periods of the reef beach body, the high-frequency sequences can well control the reef beach body development and is of great significance for the later reel-flat reservoirs prediction.
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Received: 18 December 2012
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2013, Vol. 31 
