Really depends on the reservoir and the amount of connate water. It's not near as bad in South Texas around the eagle Ford just due to less water. The Delaware basin is a water field that makes some oil and gas too...
100% this. Although it's a chicken egg situation. There wouldn't be near as much produced water without fracing since the wells wouldn't have been drilled in the first place so no need to dispose of produced water. The injection of produced water typically pressures up and lubricates existing fault planes causing them to slip.
Anonymous Indians since we've never met them