| Burial Dissolution of Ordovician Granule Limestone in the Tahe Oilfield of the Tarim Basin, NW China, and Its Geological Significance |
| |
| 作者姓名： | LIU Chunyan LIN Changsong WANG Yi WU Maobing |
| |
| 作者单位： | Institute of Energy, China University of Geosciences, Beijing 100083; Institute of Oil Exploration and Production, Sinopec, Beijing 100083;Institute of Energy, China University of Geosciences, Beijing 100083;Institute of Oil Exploration and Production, Sinopec, Beijing 100083;Institute of Oil Exploration and Production, Sinopec, Beijing 100083 |
| |
| 基金项目： | This study is supported by the National Basic Research Program of China (Project No. 2006CB202302). |
| |
| 摘 要： | With a comprehensive study on the petrology, geology and geochemistry of some Ordovician granule limestone samples in the Tahe Oiifieid of the Tarim Basin, two stages of burial dissolution were put forward as an in-source dissolution and out-source dissolution based on macro-microcosmic petrology and geochemistry features. The main differences in the two stages are in the origin and moving pass of acid fluids. Geochemical evidence indicates that burial dissolution fluids might be ingredients of organic acids, CO2 and H2S associated with organic matter maturation and hydrocarbon decomposition, and the in-source fluid came from organic matter in the granule limestone itself, but the out-source was mainly from other argillaceous carbonate rocks far away. So, the forming of a burial dissolution reservoir resulted from both in-source and the out-source dissolutions. The granule limestone firstly formed unattached pinholes under in-source dissolution in situ, and afterwards suffered wider dissolution with out-source fluids moving along unconformities, seams, faults and associate fissures. The second stage was much more important, and the mineral composition in the stratum and heat convection of the fluid were also important in forming favorable reservoirs.
|
| 关 键 词： | 油田 塔里木盆地 形成机制 奥陶纪 地质学 |
| 收稿时间： | 2007/10/30 0:00:00 |
| 修稿时间： | 2008/3/21 0:00:00 |
Burial Dissolution of Ordovician Granule Limestone in the Tahe Oilfield of the Tarim Basin, NW China, and Its Geological Significance |
| |
| Authors: | LIU Chunyan LIN Changsong WANG Yi WU Maobing |
| |
| Institution: | [1]Institute of Energy, China University of Geosciences, Beijing 100083 [2]Institute of Oil Exploration and Production, Sinopec, Beijing 100083 |
| |
| Abstract: | With a comprehensive study on the petrology,geology and geochemistry of some Ordovician granule limestone samples in the Tahe Oilfield of the Tarim Basin,two stages of burial dissolution were put forward as an in-source dissolution and out-source dissolution based on macro-microcosmic petrology and geochemistry features.The main differences in the two stages are in the origin and moving pass of acid fluids.Geochemical evidence indicates that burial dissolution fluids might be ingredients of organic acids,CO_2 and H_2S associated with organic matter maturation and hydrocarbon decomposition,and the in-source fluid came from organic matter in the granule limestone itself,but the out-source was mainly from other argillaceous carbonate rocks far away.So, the forming of a burial dissolution reservoir resulted from both in-source and the out-source dissolutions.The granule limestone firstly formed unattached pinholes under in-source dissolution in situ,and afterwards suffered wider dissolution with out-source fluids moving along unconformities, seams,faults and associate fissures.The second stage was much more important,and the mineral composition in the stratum and heat convection of the fluid were also important in forming favorable reservoirs. |
| |
| Keywords: | burial dissolution Ordovician formation mechanism Tahe Oilfield Tarim Basin |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《Acta Geologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Geologica Sinica》下载免费的PDF全文 |
|
