Effect Factor Analysis of Oil Content of Upper Triassic Oil Shale in Tongchuan Area, Ordos Basin

Abstract

Abstract: Tongchuan oil shale is located in Weibei Uplifted Area southwest of Ordos Basin, and it is mainly developed in Member Chang7 and Member Chang6 of Triassic Yanchang Formation, with Ⅱ1 and Ⅱ2 organic matter, and medium oil content. And it is at the immature and low-mature stage. Oil content and TOC are positively correlated with organic carbon; oil shale could be formed when TOC is higher than 0.997 or organic carbon is higher than 10.4%. In addition, a correlation exists between kerogen maceral and oil content to a certain degree. Tongchuan oil shale is formed in fresh water and reductive surroundings rich in organic matter. Enrichment, preservation condition, abundance and type of organic matter in oil shale are affected by flooding, oxygen deficiency, volcanic event and turbidity-current event occurred asMember Chang7 deposited, and thus the oil content is influenced

Key words: Ordos Basin, Tongchuan Area, oil shale, oil content, effect factor

CLC Number:

P618.13

Sun Shasha, Liu Renhe and Bai Wenhua. Effect Factor Analysis of Oil Content of Upper Triassic Oil Shale in Tongchuan Area, Ordos Basin[J]. China Petroleum Exploration, 2011, 16(2): 79-83,88.

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Effect Factor Analysis of Oil Content of Upper Triassic Oil Shale in Tongchuan Area, Ordos Basin

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