A.鉆超深井 B.鉆鹽巖層和含鹽量較高的水層 C.保護(hù)油、氣層 D.鉆松軟地層
A.3.3%~3.7% B.33%~37% C.10%~30% D.1%~3%
A.5~7 B.7~9 C.9~11 D.11~13