Biolithite loss zone is a kind of special reservoirs where rock structure is frailish and lot of pore spaces and gas exist, while severe circulation loss and well blowout and well kick occur.

• 礁灰岩漏失地层是一类结构脆弱,并含有大量孔洞和气体的特殊地层,常常是严重井漏与天然气的井喷井涌并存。