Geologic Featur e and Study Progr ess of Silur ian Asphaltic Sandstone in Tazhong Area, Tarim Basin

Abstract

Abstract: The Silurian asphalt sandstone is widespread in Tazhong area of Tarim basin and mainly found in the upper slope of paleouplift 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.

Key words: Tarim basin, Tazhong uplift, Silurian, asphalt sandstone

CLC Number:

GUO Jian-jun, CHEN Jian-fa. Geologic Featur e and Study Progr ess of Silur ian Asphaltic Sandstone in Tazhong Area, Tarim Basin[J]. Xinjiang Petroleum Geology, 2006, 27(2): 151-155.

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