Geochronology of hydrocarbon accumulation and reconstruction is an important and challenging subject of petroleum geology in multi-cycle superimposed basin. By fluid inclusion （FI） analysis combined with the apatite...Geochronology of hydrocarbon accumulation and reconstruction is an important and challenging subject of petroleum geology in multi-cycle superimposed basin. By fluid inclusion （FI） analysis combined with the apatite fission track （AFT） modeling thermal path of the FI host rock, a case study of constraining the hydrocarbon accumulation and reconstruction periods of the Permian reservoirs in Northeast Ordos Basin （OB） has been conducted. The FI homogenization temperatures of the oil-gas-bearing sandstone core-samples from the Lower to Upper Permian reservoirs statistically present two groups with a low and a high temperature peaks in ranges of 90-78 and 125-118 ℃, re- spectively, corresponding to 2-stage primary hydrocarbon accumulations of the Early-Middle Mesozoic. Besides, there exists another group with a medium-high peak temperature of 98 ℃ in the Upper Per- mian reservoirs, corresponding to the hydrocarbon reconstruction and destruction of the Late Meso- zoic to Cenozoic. According to the projected ages of the FI peak temperatures on the AFT thermal path of the FI host rocks, it is further induced that there experienced 3-stage hydrocarbon accumulations in the Permian reservoirs during the Mesozoic to Cenozoic. These are： （1） all the various primary hydro- carbon Permian reservoirs together developed 2-stage accumulations of 162-153 and 140-128 Ma in agreement with the multi-cycle subsidence burial heating process of the basin; （2） the Upper Per- mian reservoirs further experienced 1-stage secondary hydrocarbon accumulation and re- construction at ca. 30 Ma in coincidence with a critical tectonic conversion of the slow to rapid uplifting process from the Late Cretaceous to Neogene.展开更多
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 wi...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 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.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℃ and 125-118℃,respectively corresponding to 2-stage primary OGA processes of 162-153 Ma and 140-128 Ma in the Permian reservoirs,but also appear a medium temperature group with the peak of 98℃ 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.展开更多
基金supported by the Special Research Fund ofMinistry of Education,China(No.20116101110006)the Preferred Foundation of Study Abroad Returnees of the Human Resources and Social Security of China(No.20105SWZ26)the Key Project of Natural Science Basic Research Plan inShaanxi Province,China(No.2012JZ5001)
文摘Geochronology of hydrocarbon accumulation and reconstruction is an important and challenging subject of petroleum geology in multi-cycle superimposed basin. By fluid inclusion （FI） analysis combined with the apatite fission track （AFT） modeling thermal path of the FI host rock, a case study of constraining the hydrocarbon accumulation and reconstruction periods of the Permian reservoirs in Northeast Ordos Basin （OB） has been conducted. The FI homogenization temperatures of the oil-gas-bearing sandstone core-samples from the Lower to Upper Permian reservoirs statistically present two groups with a low and a high temperature peaks in ranges of 90-78 and 125-118 ℃, re- spectively, corresponding to 2-stage primary hydrocarbon accumulations of the Early-Middle Mesozoic. Besides, there exists another group with a medium-high peak temperature of 98 ℃ in the Upper Per- mian reservoirs, corresponding to the hydrocarbon reconstruction and destruction of the Late Meso- zoic to Cenozoic. According to the projected ages of the FI peak temperatures on the AFT thermal path of the FI host rocks, it is further induced that there experienced 3-stage hydrocarbon accumulations in the Permian reservoirs during the Mesozoic to Cenozoic. These are： （1） all the various primary hydro- carbon Permian reservoirs together developed 2-stage accumulations of 162-153 and 140-128 Ma in agreement with the multi-cycle subsidence burial heating process of the basin; （2） the Upper Per- mian reservoirs further experienced 1-stage secondary hydrocarbon accumulation and re- construction at ca. 30 Ma in coincidence with a critical tectonic conversion of the slow to rapid uplifting process from the Late Cretaceous to Neogene.
基金supported by the National Basic Research Program of China (No.2003CB2146007)the Special Research Fund for the Doctoral Program of Colleges and Universities of the National Education Ministry of China (No. 20116101110006)+2 种基金the Key Project of Natural Science Basic Research Plan in Shaanxi Province of China (No.2012JZ5001)the Oil-gas Survey Project of China Geological Survey Bureau (1212011220761)the Preferred Foundation of Study Abroad Returnees of the Human Resources and Social Security of China
文摘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 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.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℃ and 125-118℃,respectively corresponding to 2-stage primary OGA processes of 162-153 Ma and 140-128 Ma in the Permian reservoirs,but also appear a medium temperature group with the peak of 98℃ 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.
