New fields,new types and resource potentials of oil-gas exploration and development in Santanghu Basin
Over the past 30 years,significant progress has been made in the oil-gas exploration and development of Jurassic low-pres-sure sandstone reservoirs,Permian tuff reservoirs,and Carboniferous volcanic weathering crust reservoirs in Santanghu Basin,with the proved geological reserves of 168 × 108 t and a production capacity of crude oil of 56 × 104t/a.The remaining oil-gas resources in Santanghu Basin have great potentials,but the proved unused reserves are insufficient.It is necessary to expand new fields and im-plement new types of oil-gas exploration and development,so as to achieve new discoveries and breakthroughs,and support stable and sustainable oil-gas production.Based on the understandings from the recent research on basin structure,source rock distribu-tion,reservoir characteristics,as well as coal rock experiment,four new fields are proposed,i.e.,southern thrust belt,shale oil in subsag areas,megaclast reservoirs at the near-source margin,and interior reservoirs in Carboniferous volcanics,with the petroleum geological resources of 0.86 × 108t,2.45 × 108t,0.69 × 108 t and 0.96 × 108t,respectively.Also,two new types are proposed,i.e.,coalbed methane in Jurassic Xishanyao Formation and tar-rich coal in Badaowan Formation,with the coalbed methane resources of 1 427 × 108 m3 and tar resources of 60.1 × 108 t,respectively.There is great resource potentials and broad prospects for exploration and development.Based on the hydrocarbon exploration degrees,geological conditions,and development technologies,deployments and arrangements were made at three levels,i.e.,strategic deployment,strategic breakthrough,and strategic preparation.
resource potentialexploration and developmentforeland thrust beltshale oilvolcanic reservoirscoal-based oil-gasSantanghu Basin
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