Diagenesis of Lower Cretaceous Reservoir Sandstones from Jiudong&nbsp; Depression in Jiuquan Basin

LV  Cheng-Fu, QIN  Chang-Wen, CHEN  Guo-Dun, DU  Gui-Chao, CHEN  Ji, HAN  Xiao-Song, WEI  Hao-Yuan

doi:10.11764/j.issn.1672-1926.2010.06.939

Natural Gas Geoscience >

2010 , Vol. 21 >Issue 6: 939 - 946

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.06.939

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Diagenesis of Lower Cretaceous Reservoir Sandstones from Jiudong Depression in Jiuquan Basin

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1.Key Laboratory of Petroleum Resources Research，Institute of Geology and Geophysics，Chinese
Academy of Sciences，Lanzhou 730000,China;2.CNOOC Research Center，Beijing 100027，China;
3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;4.Yumen Petroleum Exploration and Development Institute,Yumen 735200,China.

Received date: 2010-04-16

Revised date: 2010-07-07

Online published: 2010-12-10

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Abstract

Reservoir sandstones in Jiudong depression were characterized by low porosity and low permeability and poor reservoir properties were restrictive factors for oil and gas explorations.Here we studied the petrography,diagenetic stage and diagenesis of this area,and their effects on reservoir quality based on analyses of thin sections,SEM observations,casting thin sections and fluorescence thin sections,X-ray diffraction and mercury porosimetry measurements.The reservoir sandstones of lower Cretaceous were at the late diagenetic stage A and B,with the diagenesis of compaction,cementation and dissolution.The reservoir sandstones were poor sorted,poor rounded and showed near-source characteristics.Compaction was the main factor that caused the tight reservoirs in the buried history.Clay and carbonate cements with high contents in sandstones distributed inhomogeneously,which was related to different sedimentary environments.Clay and carbonate cements were important factors controlling the quality of reservoirs.Carbonate cements greatly preserved the porosity in eodiagenesis by prevention of early mechanical compaction,and generated secondary pores in the late diagenesis by dissolution.Dissolution of feldspar grains and carbonate cements created a secondary porosity zones,thus greatly improved the reservoir qualities.

Key words： Low porosity-low permeability; Diagenesis; Diagenetic sequence; Reservoir quality; Jiudong depression

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LV Cheng-Fu, QIN Chang-Wen, CHEN Guo-Dun, DU Gui-Chao, CHEN Ji, HAN Xiao-Song, WEI Hao-Yuan . Diagenesis of Lower Cretaceous Reservoir Sandstones from Jiudong Depression in Jiuquan Basin[J]. Natural Gas Geoscience, 2010 , 21(6) : 939 -946 . DOI: 10.11764/j.issn.1672-1926.2010.06.939

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