银根-额济纳旗盆地拐子湖凹陷白垩系油源对比分析

Cretaceous oil-source correlation in Guaizihu Sag, Yin'gen-E'ji'naqi Basin

王萍 向连格 姜海健 陈清堂 史大海 陈强路 王杰 徐良发

WANG Ping XIANG Liange JIANG Haijian CHEN Qingtang SHI Dahai CHEN Qianglu WANG Jie XU Liangfa

1. 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126; 2. 宁夏回族自治区地质调查院, 银川 750021; 3. 中国石化 中原油田分公司, 河南 濮阳 457000

1. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China; 2. Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan, Ningxia 750021, China; 3. Zhongyuan Oil Field Branch Company, SINOPEC, Puyang, Henan 457000, China

银根-额济纳旗盆地拐子湖凹陷X井白垩系巴音戈壁组二段发现的高产油流展示了该低勘探盆地的光明前景。目前对原油的来源尚没有统一的认识，为了有效预测油气藏和明确勘探方向，开展了油源对比研究。对X井苏红图组一段油砂、巴音戈壁组二段原油及苏红图组二段、巴音戈壁组二段、巴音戈壁组一段泥岩开展的族组分含量、生物标志化合物及碳同位素组成等研究表明，油砂、原油与巴音戈壁组一段烃源岩各方面地化特征最为接近，生标上均具有高C30重排藿烷、高伽马蜡烷含量、低Pr/Ph值、高成熟度的特征，反映出X井苏红图组一段油砂和巴音戈壁组二段原油同源，均与巴音戈壁组一段烃源岩具有良好的亲缘关系。

Recently, high oil product was gained in the second member of the Cretaceous Bayingebi Formation (K1b2) in the well X in the Guaizihu Sag of Yin'gen-E'ji'naqi Basin, which revealed a bright exploration prospect. It has not obtained a quite unified understanding of petroleum source, so some research were made on the oil-source correlation,which will be helpful for the prediction of hydrocarbon reservoir and the selection of exploration direction. The analyses of composition, biomarker and carbon isotope were made with oil sand samples from the first member of Suhongtu Formation (K1s1), crude oil samples from the second member of Bayingebi Formation, and mudstone samples from the second member of Suhongtu Formation (K1s2) as well as and the second and first members of Bayingebi Formation. The geochemical features of oil sands, crude oil are close with K1b1 source rocks, showing high contents of C30-diahopane and gammacerane, low Pr/Ph and high maturity. The good similarity reflects that K1s1 oil sands and K1b2oil are homologous, and their parent material are both from K1b1source rocks.

国家科技重大专项（2017ZX05005001）和国家自然科学基金（41872122）联合资助。

https://doi.org/10.11781/sysydz201903427