Aryl-Isoprenoids in Crude Oil and Its Implication in Geological Exploration

Abstract

Abstract: Investigations of aryl-isoprenoids in sedimentary organic matter suggest that these compounds are the diagenetic productsof certain precursors from photosynthetic green sulphur bacteria Chlorobiaceae,indicating that its source rock was formed in anintense reductive environment.Marine oils from the tableland-basin region in Tarim basin generally contain abundant aryl-isoprenoids with the carbon number range of C]o~C23 The pyrolytic products of the bitumen fraction in the oils are also characterized by a typical sulphur bacteria origin,i.e.,an abnormal enrichment of tetra-methyl benezenes in the C2~C5 alkylbenzene fraction. These data indicate that the major marine oil and gas were originated at least from one set of the importantsource rocks developed in a water-layered anaerobic sedimentary environment in the tableland-basin region of Tarim basin,iraddition to the consensus that they were derived from the Upper-Mid Ordovician sedimentary rocks with clay -mottar dome faciescontrolled by the upwelling ocean current in an incline at the platform margin.

Key words: Tarim basin, aromatic hydrocarbon, Paleozoic, organic matter, anaerobic bacteria

CLC Number:

Aryl-Isoprenoids in Crude Oil and Its Implication in Geological Exploration. Aryl-Isoprenoids in Crude Oil and Its Implication in Geological Exploration[J]. Xinjiang Petroleum Geology, 2004, 25(1): 215-218.

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