High Abundance Carotane from Marine Strata in Well Gulong-1 in Tarim Basin and Its Geological Significance

Abstract

Abstract: β-carotane is a saturated C40 dicyclic alkane, which is generally used as an indicator of strongly reducing lacustrine environment. The organic matter detected from marine Ordovician strata in Well Gulong-1 in Tarim basin is characterized by high concentration of C₂₈ sterane (28%~31%) and gammacerane (m(G)/m(C₃₀H)=0.29~0.39), C23 concentration is predominant in tricyclic terpanes. These different features from source rocks of Middle-Upper Ordovician and Cambrian indicate that there is another source rock of Lower Ordovician or Cambian in southwestern slope of Manjiar sag or Guchengxu uplift formed in strongly reducing or oxygen-free sedimentary environment, besides existed Middle-Lower Cambian and Middle-Upper Ordovician source rocks, from which the hydrocarbon drainage had happened toward Guchengxu uplift. The geochemical analysis suggests that these organic maters underwent biodegradation here.

Key words: Tarim basin, Well Gulong-1, β-carotane, γ-carotane, source rock

CLC Number:

TE112.113

GUO Jian-jun, CHEN Jian-fa, CHEN Zhong-yu. High Abundance Carotane from Marine Strata in Well Gulong-1 in Tarim Basin and Its Geological Significance[J]. Xinjiang Petroleum Geology, 2007, 28(5): 585-588.

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