Generating and maintaining conductivity of microfractures in tight formations by generating gas and heat

A method comprising:

• (a) introducing a first pad fluid into a subterranean formation at a rate and pressure sufficient to create or enhance at least one fracture therein,
• wherein the first pad fluid comprises a first pad base fluid, micro-proppant particulates, and either a gas-generating chemical or an activator;
• (b) placing the micro-proppant particulates and the gas-generating chemical or the activator present in the first pad fluid into the at least one fracture;
• (c) introducing a second pad fluid into the subterranean formation,
• wherein the second pad fluid comprises a second pad base fluid and either of the gas-generating chemical or the activator that is not present in the first pad base fluid;
• (d) reacting the gas-generating chemical and the activator in the at least one fracture so as to generate gas and heat, thereby creating or enhancing at least one microfracture therein;
• (e) introducing a fracturing fluid into the subterranean formation,
• wherein the fracturing fluid comprises a fracturing base fluid and macro-proppant particulates;
• and
• (f) placing the macro-proppant particulates into the at least one fracture so as to form a proppant pack therein.