Near-bit ultradeep measurement system for geosteering and formation evaluation

A downhole drilling system for directional drilling, comprising:

• a drill bit,
• a downhole motor configured to rotate the drill bit;
• a deep-reading electromagnetic logging tool comprising a first antenna array,
• a near-bit resistivity tool comprising a second antenna array;
• wherein the first antenna array is disposed above the downhole motor and
• the second antenna array is disposed below the downhole motor and above the drill bit,
• wherein the first antenna array comprises a first transmitter and at least two first receivers that receive signals transmitted from the first transmitter, and a distance between the first transmitter and one of the at least two first receivers is larger than 10 meters and less than or equal to 17 meters, and
• wherein the second antenna array comprises a second transmitter and at least two second receivers.