Fluid Inclusion Analysis for Constraining the Hydrocarbon Accumulation Periods of the Permian Reservoirs in Northeast Ordos Basin  

作　　者：陈刚 李书恒 章辉若 杨甫 丁超 雷盼盼 胡延旭 

机构地区：[1]State Key Laboratory of Continental Dynamics and Department of Geology,Northwest University [2]Changqing Oilfield Company,PetroChina Company Limited,CNPC [3]Department of Geology,Northwest University

出　　处：《Journal of Earth Science》2013年第4期589-598,共10页地球科学学刊（英文版）

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)

摘　　要：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.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.

关 键 词：Northeast Ordos Basin Permian reservoir fluid inclusion apatite fission track GEOCHRONOLOGY hydrocarbon accumulation. 

分 类 号：P618.13[天文地球—矿床学]