| Restoration of Eroded Thickness of the Neogene Strata in the Western Qaidam Basin and Its Significance for Oil and Gas Occurrence |
| |
| 作者姓名： | SUN Ping GUO Zeqing HE Wenyuan LIU Weihong |
| |
| 基金项目： | This study was co-funded by the National Science and Technology Major Project “Chinese large gas fields’ formation conditions, accumulation and objective evaluation” (grant No. 2016ZX05007), and the Major Special Project of Chinese Petroleum Development Technologies “A study on comprehensive supporting technologies for building oil-gas field of ten million tons in Qaidam Basin” (grant No. 2016E-0102). |
| |
| 摘 要： |
|
| 收稿时间： | 2015/12/16 0:00:00 |
| 修稿时间： | 2016/8/10 0:00:00 |
Restoration of Eroded Thickness of the Neogene Strata in the Western Qaidam Basin and Its Significance for Oil and Gas Occurrence |
| |
| Authors: | SUN Ping GUO Zeqing HE Wenyuan and LIU Weihong |
| |
| Institution: | 1 Advisory Center of CNPC, Beijing 100724, China,2 Langfang Branch, Research Institute of Petroleum Exploration and Development, CNPC, Langfang 065007,
Hebei, China
3 Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China,1 Advisory Center of CNPC, Beijing 100724, China and 2 Langfang Branch, Research Institute of Petroleum Exploration and Development, CNPC, Langfang 065007,
Hebei, China |
| |
| Abstract: | During the Pleistocene, the western Qaidam Basin has largely experienced strong structural reconstruction and strong erosion. First, the eroded thickness of Neogene strata was restored approximately by the stratigraphic profile comparison method and plane trend surface restoring method; then, accurate calculation of erosion was recovered using vitrinite reflectance, and the erosion that was restored by the trend surface restoring method was corrected; finally, a distribution map of cumulative erosion was produced. This study marks an important achievement in that one of the most important parameters of basin tectonic evolution, sedimentary evolution, and oil and gas accumulation history has been obtained, and that a basic geological problem has been solved in the Qaidam Basin. The areas with high erosion and low erosion are shown in the map and a close relation between the distribution of oil and gas fields and erosion was recognized. Large and medium oil and gas fields are mainly distributed in areas with medium and low erosion. It is difficult to form large-scale oil and gas accumulation in areas in which erosion is more than 2000 m. The mechanism of the relation between oil and gas distribution and erosion is explained. This study will be of use in predicting the distribution of oil and gas. |
| |
| Keywords: | western Qaidam Basin eroded thickness restoration method distribution characteristics significance for oil and gas occurrence |
| 本文献已被 CNKI 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 |
|
