Abstract：The control factors of the sandstone reservoir development of the Upper Paleozoic in the Ordos Basin include the synsedimentary volcanism,provenance conditions, tectonism, climate conditions, sedimentation and diagenesis. The easily dissolved volcanic clastic components(including grains and matrix), which were derived from the synsedimentary volcanism,have dominant controls on the formation of the high-permeabale and secondary dissolved-porous reservoirs in the study area. The thickly bedded weathered rocks abounding with medium-coarse grained quartz were eroded in the provenance area to the north of the Ordos Basin, thus the medium-coarse grained sandy sediments accumulated in the basin during the deposition of the Shanxi Formation and Shihezi Formation and thickly bedded sandstones were developed. The regional tectonic control is mainly represented by that the areas where incision of the inherited sags of the Ordovician occurred are usually the thickly bedded sandstones developing areas which were influenced by the river for a long period. Climate mainly influences the degree of the chemical weathering of source rocks and thus controls the composition maturity of rocks. The formation of the quartz sandstones in the coal-bearing Shanxi Formation of Permian in the basin is closely related with the humid climate conditions in the Permian. Sedimentary controls include sedimentary facies belts and sedimentary microfacies control. The former mainly controls the macro distribution of sandbodies, while the latter is shown as the difference of petrophysical properties of different microfacies. Diagenesis has various influences. Influences of filling, replacement and cementation of the carbonate minerals on the reservoirs tightening are analyzed in this paper. The tightening of the reservoir is probably due to the reason that the sandstones are distributed in the exposed environments near the ground surface.
Yang Yihua,Bao Hongping,Jia Yani et al. Analysis on control factors of sandstone reservoir of the Upper Paleozoic in Ordos Basin[J]. JOPC, 2008, 10(1): 25-32.
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