多期次油气成藏流体包裹体间接定年——以鄂尔多斯盆地东北部二叠系油气藏为例  

Indirect dating of multi-stage hydrocarbon accumulations by fluid inclusion data:a case study of the Permian hydrocarbon accumulation in the northeast Ordos Basin

作　　者：陈刚[1] 丁超[1] 徐黎明[2] 章辉若[2] 李楠[1] 李岩[1] 胡延旭[1] 黄得顺[1] 

机构地区：[1]西北大学地质学系大陆动力学国家重点实验室,陕西西安710069 [2]中国石油长庆油田公司,陕西西安710021

出　　处：《石油学报》2012年第6期1003-1011,共9页Acta Petrolei Sinica

基　　金：国家重点基础研究发展计划(973)项目(2003CB214607);国家留学回国人员择优资助与留学基金西部计划项目(2007108644);教育部高校博士点专项科研基金项目(20116101110006);陕西省自然科学基金重点项目(2012JZ5001)资助

摘　　要：多期次油气成藏年代学是多旋回叠合盆地油气成藏动力学研究的热点问题。运用流体包裹体测温与其宿主岩层磷灰石裂变径迹(AFT)热史模拟相结合的研究方法,探讨了鄂尔多斯盆地东北部二叠系多期次油气成藏的温度和时间序列。结果表明,研究区二叠系不同含油气层段中生代—新生代总体经历了2～3期油气成藏事件:①二叠系各层段在中生代早中期多旋回沉降埋藏增温阶段经历了2期原生油气成藏事件,成藏温度主要分布在78.9～89.3℃和120.7～124.5℃,成藏时间分别为距今162～153 Ma和140～128 Ma;②上二叠统在晚白垩世以来抬升改造阶段经历了1期油气次生成藏事件,成藏温度主要集中在98.6℃,成藏时间接近30 Ma。对于多旋回叠合含油气盆地复杂成岩-成藏系统而言,多井段样品、多类型定年数据与其宿主岩石构造热演化史相结合的系统分析,有可能是更为客观地全面认识多旋回叠合盆地油气成藏期次和时间及其多期次油气动态成藏过程的重要途径。Geochronology of multi-stage hydrocarbon accumulations is a key frontier for petroleum reservoir-forming dynamics in a multi-cycle superimposed basin.An indirect dating method is introduced in the present paper that combines fluid inclusion（FI） analysis with FI homogenization temperature peaks of oil-gas-bearing sandstone samples and the apatite fission track（AFT） thermal modeling of the FI host rock.A case study of times of Permian multi-stage hydrocarbon accumulations in the northeast Ordos Basin was conducted,and it reveled generally that there have been 2～3 stages of hydrocarbons accumulations in different Permian strata since Meso-Cenozoic.The various Permian hydrocarbon-bearing intervals experienced 2 stages of primary hydrocarbon accumulations during 162～153 Ma and 140～128 Ma,respectively,corresponding to two domains of temperature peaks at 78.9～89.3℃ and 120.7～124.5℃,respectively,in coincidence with the Early-Middle Mesozoic multi-cycle subsidence-burial heating processes.The Upper Permian reservoirs further experienced at least 1 stage of secondary hydrocarbon accumulation in 30 Ma,corresponding to a temperature peak at 98.6℃ in coincidence with the Late Cretaceous to Neogene uplifting process of the basin.The integrated analysis of muliti-well interval samples and multi-type dating data with techono-thermal history of the host rock is therefore considered as an important approach to systemically realize the time sequence and dynamic process of multi-stage oil-gas accumulations in the superimposed basin.

关 键 词：鄂尔多斯盆地东北部 二叠系 油气成藏年代学 流体包裹体分析 磷灰石裂变径迹热史模拟 

分 类 号：TE112.3[石油与天然气工程—油气勘探]