Geochronological Records of Oil-Gas Accumulations in the Permian Reservoirs of the Northeastern Ordo

来源 :Acta Geologica Sinica(English Edition) | 被引量 : 0次 | 上传用户:li_qinglong
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Geochronology of oil-gas accumulation(OGA)is a challenging subject of petroleum geology in multi-cycle superimposed basins.By K-Ar dating of authigenic illite(AI)and fluid inclusion(FI)analysis combined with apatite fission track(AFT)thermal modeling,a case study of constraining the OGA times of the Permian reservoirs in northeast Ordos basin(NOB)has been conducted in this paper.AI dating of the Permian oil-gas-bearing sandstone core-samples shows a wide time domain of178–108 Ma.The distribution of the AI ages presents 2-stage primary OGA processes in the Permian reservoirs,which developed in the time domains of 175–155 Ma and 145–115 Ma with 2-peak ages of165 Ma and 130 Ma,respectively.The FI temperature peaks of the samples and their projected ages on the AFT thermal path not only present two groups with a low and a high peak temperatures in ranges of 90–78°C and 125–118°C,respectively corresponding to 2-stage primary OGA processes of162–153 Ma and 140–128 Ma in the Permian reservoirs,but also appear a medium temperature group with the peak of 98°C in agreement with a secondary OGA process of c.~30 Ma in the Upper Permian reservoirs.The integrated analysis of the AI and FI ages and the tectono-thermal evolution reveals that the Permian reservoirs in the NOB experienced at least 2-stage primary OGA processes of 165–153 Ma and 140–128 Ma in agreement with the subsidence thermal process of the Mid-Early Jurassic and the tectono-thermal event of the Early Cretaceous.Then,the Upper Permian reservoirs further experienced at least 1-stage secondary OGA process of c.~30 Ma in coincidence with a critical tectonic conversion between the slow and the rapid uplift processes from the Late Cretaceous to Neogene. Geochronology of oil-gas accumulation (OGA) is a challenging subject of petroleum geology in multi-cycle superimposed basins. BY Ky Ar dating of authigenic illite (AI) and fluid inclusion (FI) analysis combined with apatite fission track modeling, a case study of constraining the OGA times of the Permian reservoirs in northeast Ordos basin (NOB) has been conducted in this paper. A dating of the Permian oil-gas-bearing sandstone core-samples shows a wide time domain of 178-108 Ma. The distribution of the AI ​​ages presents 2-stage primary OGA processes in the Permian reservoirs, which developed in the time domains of 175-155 Ma and 145-115 Ma with 2-peak ages of 165 Ma and 130 Ma, respectively. FI temperature peaks of the samples and their projected ages on the AFT thermal path not only present two groups with a low and a high peak temperatures in ranges of 90-78 ° C and 125-118 ° C, respectively corresponding to 2-stage primary OGA processes of 162-153 Ma and 140-128 Ma in the P ermian reservoirs, but also appear a medium temperature group with the peak of 98 ° C in agreement with a secondary OGA process of c. ~ 30 Ma in the Upper Permian reservoirs. The integrated analysis of the AI ​​and FI ages and the tectono-thermal evolution reveals that the Permian reservoirs in the NOB experienced at least 2-stage primary OGA processes of 165-153 Ma and 140-128 Ma in agreement with the subsidence thermal process of the Mid-Early Jurassic and the tectono-thermal event of the Early Cretaceous. Chen, the Upper Permian reservoirs further experienced at least 1-stage secondary OGA process of c. ~ 30 Ma in coincidence with a critical tectonic conversion between the slow and the rapid uplift processes from the Late Cretaceous to Neogene.
其他文献
本文通过对荣华二采区10
期刊
初中语文作为初中阶段重要的科目,如何引导学生学好初中语文是初中语文教师重要的任务,学好初中语文对于学生的理解能力和阅读能力都有很大的帮助,初中语文主要包括阅读、写作、
在较长时间的戏曲创作辅导工作中,常常会遭遇这样一种情况,就是许多人往往并不关心戏曲的戏剧性,更不琢磨如何使“戏剧性”得以深厚,而主要把注意力放在故事或情节甚至许许多
我国汉代外交家张骞的故里——陕西省城固县——有31%的耕地种植着柑橘,年产柑橘20万吨,占西北地区柑橘总产量的70%,成为西北地区乃至我国柑橘生产北缘地带最大的优质柑橘生
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
2008年11月,我在海南意外地品尝了此前从未吃过的水果——莲雾。莲雾的模样堪称俊美,外形和大小都接近华北地区常见的雪花梨,其表皮色泽红润,十分光滑,有一种素雅的蜡质光泽
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7