鄂尔多斯盆地三叠系延长组超低渗透储层致密史与油藏成藏史

doi:10.11743/ogg20090205

Abstract

Abstract:

According to the genesis of the super-low permeability reservoirs in the Late Triassic Yanchang Formation in the central Ordos lacustrine basin,diagenetic sequences and homogenization temperature of host minerals of inclusions were analyzed.Hydrocarbon inclusions in albite were formed during the early charging in the early of the Late Jurassic;hydrocarbon inclusions in quartz overgrowth developed during the peak hydrocarbon generation and expulsion in the Early Cretaceous;while those in ferruginous carbonates were generated during the early phase of the uplifting and cooling process at the end of the Early Cretaceous and were the products of late charging.Taking account of current development characteristics of pores in the reservoirs,palaeo-porosity and palaeo-permeability of reservoirs during the peak hydrocarbon generation and expulsion were discussed.It is proposed that the super-low permeability reservoirs had not been developed during the peak hydrocarbon generation and expulsion,and that cementing of ferruginous carbonates is the crucial factor for the compacting of reservoirs.

Key words: compacting history, accumulating history, hydrocarbon inclusion, diagenestic sequence, paleo-physical property, super-low permeability reservoir, Ordos Basin

CLC Number:

TE122

Deng Xiuqin, Liu Xinshe, Li Shixiang. The relationship between compacting history and hydrocarbon accumulating history of the super-low permeability reservoirs in the Triassic Yanchang Formation in the Ordos Basin[J]. Oil & Gas Geology, 2009, 30(2): 156-161.

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The relationship between compacting history and hydrocarbon accumulating history of the super-low permeability reservoirs in the Triassic Yanchang Formation in the Ordos Basin

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