西湖凹陷孔雀亭地区原油特征与来源分析

Characteristics and Sources Analysis of Crude Oil in Kongqueting Area, Xihu Sag

张如凤 杨鹏程 杨超 张书迪 赵嘉骏

ZHANG Rufeng YANG Pengcheng YANG Chao ZHANG Shudi ZHAO Jiajun

中国石油化工股份有限公司上海海洋油气分公司研究院，上海　200120 中石化海洋石油工程有限公司上海钻井分公司，上海　201208

Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China SINOPEC Offshore Petroleum Engineering Co. Ltd. Shanghai Drilling Branch, Shanghai 201208, China

为解决西湖凹陷孔雀亭地区油气来源复杂的问题，利用地球化学分析手段，依据原油生物标志化合物特征和碳同位素特征，对孔雀亭不同构造位置的原油进行了分析，并进一步分析其油气来源。孔雀亭地区不同构造带的原油特征差异明显，第一类原油是以陆源高等植物贡献为主的原油，主要来源于本地脂镜贫氢相煤系烃源岩，高带、中低带和南翼原油属于此类；第二类原油是以陆源高等植物和水生生物双重贡献的原油，北翼原油属于此类，主要来源于周边深层脂镜富氢相的暗色泥岩。该文据原油来源分析，进一步明确了西湖凹陷深部勘探潜力。

To solve the problem of complex sources of crude oil in Kongqueting area, Xihu Sag, using geochemical analysis methods, oil samples from different structural locations of Kongqueting area were analyzed based on the characteristics of biomarker characteristics and carbon isotope. Oil sources were further analyzed. The characteristics of crude oil in different structural zones in Kongqueting area vary significantly. The first type of crude oil is mainly contributed by terrestrial higher plants, which mainly comes from local lipid-mirror hydrogen depleted coal measures source rocks, and crude oil of the high, middle, and low zones, as well as the crude oil of the southern wing, belongs to this type. The second type of crude oil with the dual contributions of terrestrial higher plants and aquatic organisms, and the crude oil of the northern wing belongs to this category, which mainly comes from the dark mudstone with hydrogen-rich lipid mirror in the surrounding deep layer. Based on the analysis of oil sources, this paper further clarifies the deep exploration potential of Xihu Sag.

https://doi.org/10.3969/j.issn.1008-2336.2023.02.012