| 西藏措勤盆地郎山组沉积特征及其石油地质条件 |
| 修订日期：2000-11-25 |
| 关键词:Tibet Coqen Basin Langshan Formation depositional feature petroleum geology |
| 基金项目:原中国石油天然气集团公司“西藏措勤盆地石油地质调查”项目(QZ95102106,QZ97102110)的部分成果 |
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| Depositional Features and Petroleum Geological Conditions of Langshan Formation in Coqen Basin, Tibet |
| The Lower Cretaceous Langshan Formation is most important in the exploration of oil and gas within the Coqen basin, Tibet. It consists of marine facies carbonate rocks formed with the relative rise of sea level during marine molasse deposition in the foreland basin, and comprises neritic facies, reef facies, shoal facies, nearshore carbonate subtidal facies etc. There are three depocenters around Ge'gya, Dongcuo and the Selin Lake. Hydrocarbon source rock in Langshan Formation is mainly limestone of neritic facies, whose thickness increases toward the depocenters. The organic matter is mainly of sapropel type. Major accumulation locations are earlier-formed fractures. Facies types control to some extent the development of reservoir pores. The Langshan Formation lacks regional overlying formation. Nevertheless, mudstone or marl of nearshore subtidal facies may be effective local overlying formation. |
| WANG Guan-min.2001.Depositional Features and Petroleum Geological Conditions of Langshan Formation in Coqen Basin, Tibet[J].Acta Geoscientica Sinica,22(1):39-42. |
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