Szechwan Basin

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Szechwan Basin


(also Red Basin), an intermontane basin in China, situated in the river basin of the middle Yangtze and two of its tributaries, the Min and Chialing rivers. The basin, which has an area of 200,000 sq km, is bordered by the Sino-Tibetan Mountains in the west, the Tsinling and Tapa ranges in the north, and the Kweichow Plateau in the south. It is composed of a layer of Jurassic and Cretaceous red sandstones as much as 4,000 m in thickness (hence the name Red Basin). Shaped like a terraced amphitheater facing south toward the Yangtze River valley, the basin has average elevations of 400–500 m and rises to 1,000 m along the periphery. Flat-topped hills 50–100 m higher than the surrounding land predominate. Artificial terracing of slopes is widespread.

The region has a subtropical monsoonal climate, with a warm winter and wet summer. Annual precipitation ranges from 800 to 1,750 mm, with the maximum in the summer. Because the mountains protect the Szechwan Basin from cold northern winds, the growing season lasts almost the entire year. The rivers are used extensively for irrigation. A lower vegetation belt features broad-leaved forests, which include oak and kastanopsis. Coniferous and fir forests are found above 2,200 m. The cities of Chungking and Chengtu are situated in the Szechwan Basin.


References in periodicals archive ?
Such events are more frequent over China than over Europe and the United States during autumn and winter, especially over the Sichuan basin and Jing-Jin-Ji region of China.
One is the triangular-shaped Songpan block, which is bounded by the Xianshuihe and Kunlunshan faults to the north and south, respectively, and sandwiched between the Qinghai--Tibet internal block and Sichuan Basin.
Signed in late July, the PSC covers an area of nearly 386 square miles at Rong Chang Bei in the Sichuan Basin.
The deal, with China National Petroleum Corporation (CNPC), covers 386 square miles at Rong Chang Bei in the Sichuan Basin.
Sichuan Basin and surrounding areas are the main shale gas producing zones.
All of these factors have had an influence on exploiting the Lower Silurian Longmaxi gas shale in the Sichuan Basin.
The geological conditions in the Sichuan Basin are favorable for the development of shale gas reservoirs.
PetroChina will focus on two pilot zones -- Weiyuan-Changning in southwest Sichuan basin and Zhaotong in Yunnan province.
In March, Eni and CNPC also signed a joint study accord to cooperate in the development of the Rongchang shale gas block in the Sichuan Basin, China.
Torrential rains have battered much of the Sichuan Basin since Thursday morning, halting road traffic and causing rivers to swell, Xinhua quoted the provincial flood control and drought relief headquarters as saying.
In China, Eni and CNPC also agreed to jointly study the development of the Rongchang shale gas block, which covers 2,000 square kilometres (770 square miles) in the Sichuan Basin, and which Eni said "has proven to be the most promising in the country to date".
China's Sichuan basin, which is highly prospective for shale gas, has been the home of the country's conventional gas industry for thousands of years.