银根-额济纳旗盆地烃源岩特征及油气富集规律

doi:10.7623/syxb202108005

石油学报 ›› 2021, Vol. 42 ›› Issue (8): 1026-1038.DOI: 10.7623/syxb202108005

银根-额济纳旗盆地烃源岩特征及油气富集规律

周勇水^1,2, 李红磊^1,2, 史大海¹, 陈帆¹

1. 中国石油化工股份有限公司中原油田分公司博士后工作站河南郑州 450018;
2. 中国石油化工股份有限公司中原油田分公司勘探开发研究院河南郑州 450018

收稿日期:2020-04-24 修回日期:2020-09-09 出版日期:2021-08-25 发布日期:2021-08-31
通讯作者: 李红磊,男,1982年12月生,2006年获吉林大学学士学位,2016年获长江大学博士学位,现为中国石油化工股份有限公司中原油田分公司勘探开发研究院高级工程师,主要从事烃源岩生烃及油气成藏机理研究。Email:lishirenlei@163.com
作者简介:周勇水,男,1986年2月生,2011年获长江大学硕士学位,2014年获中国石油大学(北京)博士学位,现为中国石油化工股份有限公司中原油田分公司勘探开发研究院高级工程师,主要从事油气地球化学及油气成藏机理研究。Email:yszhou0226@sina.com
基金资助:
自然资源部重点项目"‘十三五’全国油气资源评价"（2017YQZYPJ01）资助。

Characteristics of source rocks and enrichment laws of hydrocarbons in Yin'gen-Ejinaqi Basin

Zhou Yongshui^1,2, Li Honglei^1,2, Shi Dahai¹, Chen Fan¹

1. Postdoctoral Research Workstation of Sinopec Zhongyuan Oilfield Company, Henan Zhengzhou 450018, China;
2. Exploration and Development Research Institute of Sinopec Zhongyuan Oilfield Company, Henan Zhengzhou 450018, China

Received:2020-04-24 Revised:2020-09-09 Online:2021-08-25 Published:2021-08-31

摘要/Abstract

摘要： 基于对银根-额济纳旗盆地上古生界、侏罗系和白垩系烃源岩地球化学特征的系统评价，分析了盆地内各凹陷的油气来源和富集规律。盆地上古生界石炭系—二叠系暗色泥岩整体已达到过成熟阶段，中生界凹陷内已发生浅变质—变质作用，油气保存条件较差，油气资源和勘探潜力小；中—下侏罗统发育一套煤系烃源岩，在盆地腹部及南部凹陷中已达成熟阶段，具有一定生烃潜力；白垩系巴音戈壁组烃源岩的有机质丰度高、类型较好，是盆地的主力烃源岩层系，且油源对比结果证实，盆地已发现的油气均来源于该套烃源岩。银根-额济纳旗盆地的油气成藏过程可划分为早白垩世晚期油气成藏和早白垩世末期调整改造2个阶段，油气的富集主要受巴音戈壁组烃源岩的热演化程度和晚期构造活动强度共同控制。银根-额济纳旗盆地腹部是其油气富集的最有利区，中西部是油气勘探的有利区，中东部的油气成藏条件较差。

关键词: 银额盆地, 烃源岩, 成熟度, 油气来源, 甾萜类化合物, 油气富集

Abstract: Based on systematically evaluating the geochemical characteristics of the Upper Paleozoic, Jurassic and Cretaceous source rocks in Yin'gen-Ejinaqi Basin, this paper analyzes the oil and gas sources and enrichment laws of sags in the basin. The Upper Paleozoic Carboniferous-Permian dark mudstone in the basin has reached the over-mature stage as a whole, and epimetamorphism and metamorphism had occurred in the Mesozoic inside the sag, leading to poor oil and gas preservation conditions, and less hydrocarbon resources and low exploration potential. A set of Middle-Lower Jurassic coal-measure source rocks are developed in the basin and has reached the mature stage in the central basin and the southern sag, with certain hydrocarbon potential. The source rocks of the Cretaceous Bayingebi Formation have good types of organic matter with high abundance, and they are the main source rock strata in the basin. The oil-source correlation results confirm that all the oil and gas discovered in the basin originate from this set of source rocks. The hydrocarbon accumulation process in Yin'gen-Ejinaqi Basin can be divided into two stages:hydrocarbon accumulation in the Late Early Cretaceous, adjustment and reconstruction in the Late Early Cretaceous. The hydrocarbon enrichment is mainly controlled by the thermal evolution of the Bayingebi Formation source rocks and the intensity of late tectonic activities. The hinterland of Yin'gen-Ejinaqi Basin is the most favorable area for hydrocarbon enrichment, the central-western area is favorable for oil-gas exploration, and oil and gas accumulation conditions are poor in the central-eastern area.

Key words: Yin'gen-Ejinaqi Basin, source rock, maturity, oil and gas source, steroids and terpenoids, hydrocarbon enrichment

中图分类号:

TE122.1

周勇水, 李红磊, 史大海, 陈帆. 银根-额济纳旗盆地烃源岩特征及油气富集规律[J]. 石油学报, 2021, 42(8): 1026-1038.

Zhou Yongshui, Li Honglei, Shi Dahai, Chen Fan. Characteristics of source rocks and enrichment laws of hydrocarbons in Yin'gen-Ejinaqi Basin[J]. Acta Petrolei Sinica, 2021, 42(8): 1026-1038.

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银根-额济纳旗盆地烃源岩特征及油气富集规律

Characteristics of source rocks and enrichment laws of hydrocarbons in Yin'gen-Ejinaqi Basin

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