Geochemical Characteristics and Its Significance of Permian Bitumen from Lintanchang Structure in Southeast Margin of Sichuan Basin
Received date: 2011-07-22
Revised date: 2011-09-08
Online published: 2011-12-10
Based on the detailed geological studies on the outcrop and wells about Permian,with the methods of petrology,organic and inorganic geochemistry,we make a study on the formation and destruction of Permian paleo\|oil pool.Several conclusions obtained are as follows:①There are two types of bitumen,four forms,namely the soft bitumen(calcite\|bitumen filling the cave,sheet bitumen filling the residual pore,disseminated bitumen around the bioclast) and semi\|graphite(filling in the fracture).②Bitumen in cave of Maokou limestone originates from Silurian source rock,but semi\|graphite in fracture may originate from Permian microorganisms and algae,as endogenous causes.And the alkane chromatography indicates that there is significantly different among the Silurian shale,Cambrian shale and Upper Sinian Dengying Formation bitumen.③The filling time of Maokou paleo\|oil pool is Indosinian,and oil cracking period is Yanshanian.The bitumen is the product of deep burial and tectonic compression.
Key words: Paleo-oil pool; Permian; Lintanchang; Southeast margin; Sichuan basin.
Ma Wen-xin, Liu Shu-gen, Huang Wen-ming, Wang Guo-zhi, Zhang Chang-jun . Geochemical Characteristics and Its Significance of Permian Bitumen from Lintanchang Structure in Southeast Margin of Sichuan Basin[J]. Natural Gas Geoscience, 2011 , 22(6) : 1064 -1075 . DOI: 10.11764/j.issn.1672-1926.2011.06.1064
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