Oil-Gas Source and Accumulation Characteristics of Paleogene in Bonan Sub-Sag in Shengli Oil Field

Abstract

Abstract: The distribution and characteristic of oil and gas in Bonan sub-sag in Shengli oil field are described. The oil-gas source is determined through the biomarker features of biomarkers, and the process of the oil-gas accumulation is analyzed. The research indicates that the oil-gas evolution stages between the step-fault zone and the deep zone in Bonan sub-sag are different, due to different buried depths of source rocks. The oil and gas in the 3rd and 4th members of the Shahejie formation in this sub-sag are of nature with both source and reservoir. In the step-fault zone oil-gas is accumulated in one phase, with low maturity; in the deep zone there exist two processes of petroleum accumulation, but mainly trapping the gas generated at wet gas period, with high dry coefficient and stepped trapping features.

Key words: Bonan sub-sag, accumulation stage, reservoir characteristic, Eogene, Paleogene

CLC Number:

TE112.1

GUO Rui-chao, LI Yan-jun, WANG Ting-dong, SONG Guo-qi, LI Wen-tao, YIN Chang-he, LIU Chen. Oil-Gas Source and Accumulation Characteristics of Paleogene in Bonan Sub-Sag in Shengli Oil Field[J]. Xinjiang Petroleum Geology, 2009, 30(6): 674-676.

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Oil-Gas Source and Accumulation Characteristics of Paleogene in Bonan Sub-Sag in Shengli Oil Field

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