Ordos;
Branch;
of;
Research;
Institute;
of;
Petroleum;
Exploration;
and;
Development,;
PetroChina,;
Beijing;
100083,;
China;
Langfang;
Branch;
of;
Research;
Institute;
of;
Petroleum;
Exploration;
and;
Development,;
PetroChina,;
Langfang;
065007,;
China;