求翻译：单相液体的渗流特征是油气渗流研究的基础问题，对于中、高渗透砂岩中渗流问题的研究已经进行了很多，其理论基本成熟。但对于低渗砂岩的渗流，由于其影响因素较多，渗流机理较为复杂。是什么意思？

Single-phase liquid flow characteristics of oil and gas seepage problem, many studies have been conducted in high permeability sandstone seepage theory is basically mature. , Due to its affected by many factors but low permeability sandstone seepage, percolation mechanism is more complex.

The single-phase liquid seeping oil and gas seepage characteristics is the basis of the study in question, for in sandstone, high penetration of seepage study has been carried out a lot, its basic theory. But for the low seeps through sandstone of the seeping, because of its impact factor more, seep

The single-phase liquid transfusion characteristic is the oil gas transfusion research foundation question, regarding, in the high seepage sandstone the transfusion question research has already carried on very many, its theory basic mature.But regarding infiltrates the sandstone lowly the transfusi

Seepage characteristics of single-phase liquid is the basis for research on seepage problem of oil and gas, for middle and high-permeability sandstone of seepage problems in research has been going on for many, its theoretical maturity. But for seepage in low permeability sandstone, due to its impac

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