Reservoir characteristics and evaluation methods of the Upper Paleozoic Taiyuan Formation in the eastern margin of Ordos Basin
In view of the strong heterogeneity of lithology and physical properties of tight rock reservoirs in Taiyuan Formation and the unclear development characteristics of effective reservoirs,the understanding of natural gas reservoir enrichment law has been affected.In this paper,the basic geological data were deeply excavated to analyze the reservoir characteristics of Taiyuan Formation in detail,and the following understandings were found:(1)The reservoir of Taiyuan Formation is a typical tight sandstone.The lithology is mainly fine-coarse grained lithic sandstone,quartz sandstone,low porosity and low permeability,and the reservoir formed by strong hydrodynamic deposition such as tidal flat,sand bar and underwater distributary channel is conducive to gas reservoir formation and easy to form a sweet spot of tight sandstone;(2)The application of gas measurement derived and methane abnormal multiple,as well as the sensitive parameters in logging data,gamma,permeability and φD-N crossplot has a good effect,can quickly identify the gas reservoir,effectively guide the later exploration and fracturing formation selection.
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