The Laojunmiao metamorphic complex, exposed on the northeastern margin of the Junggar basin,consists mainly of quartz schists of greenschist facies, with some marbles bearing pre Devonian tabulates and crinoids resting on it.

As a result, they have seriously polluted the soil of the Laojunmiao region along the petroleum river.

Study on law of productivity declining in fractured wells of M reservoir, Laojunmiao oilfield;

Laojunmiao oilfield is the first field exploited by water flooding process.

In order to study the petroleum pollution in the soil of Laojunmiao oilfield, the oil concentrations of the soil samples from three layers (surface, substrate and understratum) in four sample districts in Laojunmiao oilfield were analyzed by Soxhlet Extraction- Gravimetric method, and then the transferring of oil pollutant in soil was studied.

The paper discusses the great effect of the old metamorphic rock system in the basement of eastern china on the volcanic rocks of mesozoic era and the precious metallic and poly metallic deposits associated with magmatism,and points out that the old metamorphic rock system .

Laojunmiao structural belt is located in Cenozoic foreland thrust belt in southern margin of Jiuquan Basin, which is superposed over the southern uplift and Shida sag of Early Cretaceous faulted basin.

Laojunmiao structural belt is located in Cenozoic foreland thrust belt of south margin,Jiuquan basin,which is superposed over the south uplift and Shida depression of Early Cretaceous faulted basin.