Geologic Feature and Study Progress of Silurian Asphaltic Sandstone in Tazhong Area, Tarim Basin
2006
The Silurian asphalt sandstone is widespread in Tazhong area of Tarim basin and mainly found in the upper slope of paleo-uplift and oil-generating basin of Lower Paleozoic, which shows that the widespread asphalt sandstone could be the outcrop of paleo-oil pools in this area. The distribution of asphalt sandstone is mostly controlled by oil source, paleo-uplift, sedimentary system and petrophysical property. Microscopically, the asphalt characteristic also reflects the multi-stage filling and destructive accumulation history of Silurian hydrocarbons, with ebb and flow of oily bitumen content and colloid-asphltenes content. The strata with high asphltenes content appear relatively low volume of movable oil, and the bituminous reflectance is low and scattered, averaging 0.15%~0.50%. It is concluded that the source supply of Silurian asphalt sandstone is mainly from Middle and Lower Cambrian.
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