Compression needed for the engine to run?

What is your question?

Working on a 1995 mitsibushi diamante 3.0. Like a rookie I went for the fuel pump with a no start. I have 60psi at the pump. Injectors are firing and I believe the relays are working properly. Some carbon by rear tail pipe. Compresion tested the front three cylinders. I have 70 psi 50 psi and 100psi. The car attemps to fire when cranked but will not start. I need to do a wet test on the cylinders. I am thinking the compression is the issue. The car was also low on oil, none showing on the dip stick. I put two quarts in and it is ok now. The intake nees to be pulled to check the rear cylinders. If they are as low as the front then I have some major engine wear I recon. Have you ever gotten an engine to run with compression this low?