用储层油气包裹体岩相学确定油气成藏期次—以鄂尔多斯盆地陇东油田为例

doi:10.11743/ogg20060209

Abstract

Abstract:

The main diagenetic types of the sandstone reservoirs in Chang-3 reservoir in Longdong oilfield,Ordos basin,include compaction,cementation,corrosion and fracturing.The diagenetic authigenic minerals are dominated by chlorite,authigenetic quartz,calcite and gypsum.Two different phases of hydrocarbon inclusions have been identified according to the formation time series of the host diagenetic minerals.The hydrocarbon inclusions formed in the first phase would have been formed during the burial diagenesis in late early diagenetic stage,and are distributed in the dissolution pores and bottom of overgrowth edge of minerals,such as quartz and feldspar,as well as in earlier fractures.They are characterized by irregularity in shape and small in size,gene-(rally) in the range of 3-8 μm,and are dominated by multiple phase hydrocarbon inclusions.The hydrocarbon inclusions formed in the second phase would have been formed during basin uplifting stage in late latediagenetic stage,and are distributed in the late-formed fractures,siliceous cement and sparry calcite cement.They gene-(rally) contain saline water,and the boundaries of oil,gas and water are clear.It is believed that the former represents the process of hydrocarbon migration and charging,while the latter represents the process of large scale oil/gas accumulation and reservoiring.Based on the temperatures of hydrocarbon inclusion formed in various phases and analyses of the sedimentary and thermal evolution history of reservoirs,the time of hydrocarbon migration and charging is determined to be about 122 Ma(Early Cretaceous),while that of large-scale accumulation and reservoiring is about 80 Ma(late Late Cretaceous).

Key words: hydrocarbon inclusion, petrography, time of reservoiring, Longdong oilfield, Ordos basin

CLC Number:

TE112.3

Li Rongxi, Xi Shengli, Di Lingjun. Oil/gas reservoiring phases determined through petrographic analysis of hydrocarbon inclusions in reservoirs taking Longdong oilfield,Ordos basin,as an example[J]. Oil & Gas Geology, 2006, 27(2): 194-199,217.

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Oil/gas reservoiring phases determined through petrographic analysis of hydrocarbon inclusions in reservoirs taking Longdong oilfield,Ordos basin,as an example

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