CNOOC China Limited Tianjin Branch Tianjin 300459 China;
CNOOC China Limited Tianjin Branch Tianjin 300459 China;
Bohai Bay Basin; oil type lacustrine basin; large nature gas pool; Bozhong 19-6; regional"quilt-like"overpressure mudstone; rapid and high-intensity gas generation in late period; large scale reservoir;