东濮凹陷北部盐湖相原油特征与成因

发布时间：2018-04-05 06:06

本文选题：东濮凹陷　切入点：盐湖相　出处：《现代地质》2017年04期

【摘要】：东濮凹陷盐湖相油气成因与成藏机理研究薄弱。采用色谱/质谱(GC/MS)等常规技术,结合傅立叶变换离子回旋共振质谱、单体烃碳同位素技术,对东濮凹陷北部文明寨、卫城地区油气特征及其成因进行了解剖。结果表明,该区原油具有植烷对姥鲛烷优势显著、伽马蜡烷富集、升藿烷"翘尾"、甾烷异构化程度较低等咸水、盐湖相原油的典型特征。原油还具有正构烷烃单体烃碳同位素呈低碳重、高碳轻、近两段式分布的特征,与柴达木盐湖相原油有所差异。原油中检测到丰富的S_1、S_2、O_1S_1、N_1、O1、O_2、O_3等芳构化程度较低的NSO化合物,其与该区低熟油的形成关系密切。油-油、油-岩详细对比表明,东濮凹陷北部原油主要来自埋深超过3 000 m的沙三—沙四段烃源岩、存在不同成熟度原油混合聚集现象。研究结果对该区进一步油气勘探具有重要指示意义。
[Abstract]:The study of oil and gas genesis and accumulation mechanism of salt lake facies in Dongpu depression is weak.By using conventional techniques such as GC / MS, Fourier transform ion cyclotron resonance mass spectrometry and single hydrocarbon carbon isotope technique, the oil and gas characteristics and their genesis in Wenzhai and Wei Cheng areas in the northern part of Dongpu depression were dissected.The results show that the crude oil in this area has the typical characteristics of phytane on pristane, gamma-alkane enrichment, hopane "curling tail", low isomerization degree of sterane and salt lake phase crude oil.The crude oil also has the characteristics of low carbon weight, high carbon and light carbon distribution, which is different from that of Qaidam salt lake crude oil.In crude oil, abundant NSO compounds with lower degree of aromatization, such as S _ S _ 1 / S _ 2T _ O _ (1) S _ (1) S _ (1) S _ (1) O _ (1) O _ (1) O _ (2) O _ (3) have been detected, which are closely related to the formation of low-mature oil in this area.The detailed comparison of oil-oil and oil-rock shows that the crude oil in the northern part of Dongpu depression mainly comes from the source rock of Sha-3-Sha 4 member with a buried depth of more than 3,000 m, and there is a mixed accumulation of crude oil with different maturity.The results are of great significance for further oil and gas exploration in this area.
【作者单位】：中国石化中原油田分公司;中国石油大学(北京)资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家科技重大专项(2016ZX05006004) 国家自然科学基金项目(41673055,41473047)
【分类号】：P618.13

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