| 1 | The community similarity coefficient between the different community is less than 0.5; | |
| 2 | In Dong Sheng district, Yijinholo County, Hangjin County , there are a shortage of raw materials. | |
| 3 | Natural gas geochemical exploration; Hydrocarbon; Geochemical characteristics; Hangjinqi area; Ordos basin. ; | |
| 4 | It is quite prevalent and implicative for hydrocarbon showings of upper paleozoic on drilling in the region of hangjinqi. | |
| 5 | To program Hangjin County and Etukeqian County to be a construction area. The business enterprise scale can be appropriate to expand with full making use of surplus raw materials. |