| 非洲G盆地南部凹陷热演化史恢复及成藏期次判断 |
| |
| 引用本文： | 田涛,任战利,吴晓青,陈玉林.非洲G盆地南部凹陷热演化史恢复及成藏期次判断[J].地质科学,2013,48(4):1258-1270. |
| |
| 作者姓名： | 田涛 任战利 吴晓青 陈玉林 |
| |
| 作者单位： | 1. 西北大学大陆动力学国家重点实验室 西安 710069;
2. 中国石油集团测井有限公司 西安 710021 |
| |
| 摘 要： | 非洲G盆地是受中非剪切带影响而发育形成的典型被动裂谷盆地,其南部凹陷带为盆地主要油源区。为进一步明确G盆地油气勘探方向,需开展盆地南部凹陷热演化史及油气成藏方面的研究。油层测温表明,南部凹陷现今平均地温梯度为3.9 ℃/100 m,属于中温型地温场。根据镜质体反射率、包裹体测温恢复了G盆地凹陷带古地温演化史,研究表明G盆地凹陷白垩纪古地温梯度为2.4～3.77 ℃/100 m,古地温梯度低于现今地温梯度。古地温恢复及热史模拟表明最高地温是在现今达到的,下白垩统烃源岩热演化程度主要受现今地温场控制。包裹体均一温度分析表明G盆地南部凹陷存在两次流体作用事件,分别发生在晚白垩世早期(96.0～87.0 Ma)及第四纪(3.0～0 Ma)。下白垩统油气的主要成藏期在晚白垩世早期。
|
| 关 键 词： | 非洲G盆地 南部凹陷 古地温 热演化史 成藏期次 |
| 收稿时间： | 2013-05-05 |
| 修稿时间： | 2013-05-05; |
The geothermal history and hydrocarbon accumulation periods in the southern depression of G Basin,Africa |
| |
| Tian Tao
,
Ren Zhanli
,
Wu Xiaoqing
,
Chen Yulin.The geothermal history and hydrocarbon accumulation periods in the southern depression of G Basin,Africa[J].Chinese Journal of Geology,2013,48(4):1258-1270. |
| |
| Authors: | Tian Tao Ren Zhanli Wu Xiaoqing Chen Yulin |
| |
| Institution: | 1. National Key Laboratory of Continental Dynamics Department of Geology, Northwest University, Xi'an 710069;
2. CNPC Logging, Xi'an 710021 |
| |
| Abstract: | The G Basin is a typical passive rift basin in Africa which growth formed by the influence of the shear zone of Central Africa.And the southern depression is the most important petroleum generative depression of the basin.In order tofurther clarify the exploration direction,need carry out the study of thegeothermal history andhydrocarbon accumulation.Reservoir temperature shows that the current average geothermal gradient is 3.9 ℃/100 m,belongs to the middle geothermal field.According to the vitrinite reflectance and inclusion thermometry,restored the thermal evolution history of southern depression.The study shows that the paleogeothermal gradient of the depression was 2.4～3.77 ℃/100 m in Cretaceous and the paleogeothermal gradient is lower than today's.The paleotemperature recovery and thermal history modeling show that the maximum paleotemperature reached in the present day and the thermal evolution of Hydrocarbon source rocks in Lower Crataceous is mainly controled by present geothermal field.The study onhomogenization temperature of fluid inclusion shows that there were two fluid action events experienced in the southern depression of G Basin and they occurred at the early stage of Late Cretaceous(96.0～87.0 Ma)and Quaternary Period(3.0～0 Ma).The primaryhydrocarbon reservoir forming stages of Lower Cretaceous is the early stage of Late Cretaceous. |
| |
| Keywords: | G Basin in Africa Southern depression Palaeogeothermal Geothermal history Hydrocarbon accumulation |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《地质科学》浏览原始摘要信息 |
| 点击此处可从《地质科学》下载免费的PDF全文 |
|
