盖层封盖能力对天然气聚集的影响-以鄂尔多斯盆地大牛地气田大12井区为例

doi:10.11743/ogg20110610

Abstract

Abstract:

In view of the large variations of production capacity both vertically and laterally in Daniudi gas field,this paper analyzed the influences of the caprock sealing mechanism and capability on natural gas accumulation by cores,laboratory test and logging data.The result indicates that the caprocks are overpressure sealing caprocks consisting of interbedded tight mudstone and undercompacted mudstone.The sealing capability is jointly controlled by the normal compacted mudstone and uncompacted mudstone.Thickness,total porosity,gross-to-net ratio and abnormal pore fluid pressure are selected as parameters to assess the sealing capacity of caprocks.The sealing capability is in positive correlation with the tested average open flow capacity and the maximum open flow capacity.The 3rd member of Xiashihezi Formation is the main gas pay zone thanks to the regional caprocks,and the high yield area is located on the western edge of the study area.The other pay zones are controlled by the sealing ability of direct caprocks,their gas are too scattered with low abundance to form large-scale contig- uous gas-bearing areas which is a key factor limiting productivity in the D-12 wellblock.

Key words: caprock, sealing mechanism, natural gas, Daniudi gas field, Ordos Basin

CLC Number:

TE112.25

Zhang Wenqi, Wang Zhizhang, Hou Xiulin, Xu Fang, Liu Lang, Li Chunlei. Influences of caprock sealing capacity on natural gas accumulation: an example from D-12 wellblock of Daniudi gas field in Ordos Basin[J]. Oil & Gas Geology, 2011, 32(6): 882-889.

References

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Influences of caprock sealing capacity on natural gas accumulation: an example from D-12 wellblock of Daniudi gas field in Ordos Basin

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