zone of oil and gas accumulation
Exploration and Development of Oil and Gas
exploitation of oil and gas field
exploitation of oil and gas
EXHAUSTED OIL AND GAS RESERVOIRS
evidences of oil and gas
evaluation of oil and gas resources
evaluation of oil and gas bearing trap0
evaluation of oil and gas accumulation
EVALUATION OF OIL AND GAS
evaluating of cap rock of oil and gas
episodic reservoir-forming of oil and gas
Enrichment and migration of oil and gas
energy conservation of oil and gas gathering transportation system
early oil or gas accumulation
dynamic system of oil migration and accumulation
Downward migration of oil and gas