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Petroleum geology and exploration of Tarim Basin, China



Petroleum geology and exploration of Tarim Basin, China



Annual Meeting Abstracts - American Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists 5: 82-83



Since 1989 CNPC has carried on large-scale oil and gas exploration and geological research in Tarim Basin of Xinjiang Province, China. Twelve thousand km 2-D seismic, 4500 km (super 2) 3-D seismic, and 200 exploratory wells have been completed; 95 wells yield commercial oil or gas flows. At this time, eight oil/gas fields have been discovered; they include Lunnan, Yaha, and Tazhong No. 4, having proved 2.7X10 (super 8) t of oil and 109.2X10 (super 9) m (super 3) of gas in place. Two million six hundred thousand tons of crude oil was yielded in 1995 and 5X10 (super 6) t crude oil will be produced in 1997. The facies of discovered oil-gas pools in Tarim Basin are complex: there are condensate gas pools, volatile oil pools, normal oil pools, and some heavy oil pools. Structural traps form 80% of oil-gas pools. Oil-gases are mainly reservoired in sandstone beds. The burial depths of oil-gas pools range mainly from 4000 to 5500 m. Oil and condensate gas occupy 60% and 40% of proved reserves respectively. Oil-gas pools are mainly distributed in the Mesozoic-Cenozoic group, in which Tertiary occupies 50%, Triassic occupies 30% and Carboniferous occupies 20%. Tarim Basin is a large overlapped composite basin, composed of Paleozoic cratonic basins and Mesozoic-Cenozoic foreland basins. Paleozoic and Mesozoic-Cenozoic oil-gas pools have different distribution character. Paleozoic oil-gas accumulations are controlled by cratonic paleo-uplifts and slopes. Mesozoic-Cenozoic oil-gas accumulations are controlled by foredeep uplifts and imbricate thrust structures of foreland thrust belts.

Accession: 019706286

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