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Based on detailed studies, this paper proposesthat in the Tarim Basin, hydrocarbon reservoirs widespreadeither in vertical sequences or in plane and high-porosity andhigh-permeability reservoirs are developed all over the basin.However, obvious difference and heterogeneity exist amongdifferent kinds of reservoirs. The lithologic characteristics,reservoir space types and reservoir properties in variousstrata have been probed. The result indicates that althoughthe Paleozoic carbonates have been deeply buried for a longperiod, high-quality reservoirs with the porosity of up to 5%-8% (12% as the maximum) and the permeability of10×10~(-3)-100×10~(-3) μm~2 (1000×10~(-3)μm~2 as the maximum)can be found in certain areas. These include the area withthe development of reefs and carbonate beaches, the weath-ered-crust buried-hill belts that have undergone thelong-term exposure, weathering and leaching, the area withthe development of dolomitization, and those areas that haveexperienced the resolution of carbonic acid and organic acidgenerated by the maturity of the organic matter. Finally, thegenesis of the high-porosity and high-permeability reservoirsin deep-buried conditions (with the depth more than 3500 m)have been investigated thoroughly.
Based on detailed studies, this paper proposes that in the Tarim Basin, hydrocarbon reservoirs widespreadeither in vertical sequences or in plane and high-porosity and high-permeability reservoirs are developed all over the basin. However, difference difference and heterogeneity exist amongdifferent kinds of reservoirs. lithologic characteristics, reservoir space types and reservoir properties in various strata have been probed. The result indicates that although the Paleozoic carbonates have been deeply buried for a long period, high-quality reservoirs with the porosity of up to 5% -8% (12% as the maximum) and the permeability of10 × 10 -3 -100 × 10 -3 μm -2 (1000 × 10 -3 μm -2 as the maximum) can be found in certain areas. These two include the area with the development of reefs and carbonate beaches, the weath-ered-crust buried-hill belts that have undergone the long-term exposure, weathering and leaching, the area with the development of dolomitization, and those areas that haveexperienced the r esolution of carbonic acid and organic acidgenerated by the maturity of the organic matter. Finally, the development of the high-porosity and high-permeability reservoirsin deep-buried conditions (with the depth more than 3500 m) have been investigated thoroughly.