Geologic characteristics and controlling factors of tight sand reservoir in the mid-eastern Ordos Basin
Online published: 2013-11-26
The study on the geologic characteristics and controlling factors of Permian tight sand reservoir in the Mideastern Ordos Basin is still a blank field. Based on core description, rock sample analysis and test, and diagenetic evolution analysis, this paper studied the microscopic characteristics and controlling factors of the reservoir. The results show that the capillary pressure curves in the eighth member of Shihezi Formation and the second member of Shanxi Formation are characterized by steep tilt, which indicates poor porosity（the average value of the two members is 6.14% and 4.49% respectively） and permeability（the average value of the two members is 0.389 mD and 0.749 mD respectively）. The reservoir development is controlled by depositional settings and diagenesis. The reservoirs of the eighth member of Shihezi Formation and the second member of Shanxi Formation are mainly developed in distributary channel sand bodies of the delta front subfacies and in the late diagenetic stage B, and the second member of Shanxi Formation is even in the stage C in some region. The compaction and cementation of silica, carbonate and clay mineral make the reservoir properties poor, and dissolution is constructive for reservoir properties.
ZHENG Rongcai , WANG Haihong , HOU Changbing , WANG Changyong , WU Yanyan . Geologic characteristics and controlling factors of tight sand reservoir in the mid-eastern Ordos Basin[J]. Lithologic Reservoirs, 2013 , 25(6) : 71 -78 . DOI: 10.3969/j.issn.1673-8926.2013.06.013
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