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现代地质 ›› 2025, Vol. 39 ›› Issue (03): 787-800.DOI: 10.19657/j.geoscience.1000-8527.2024.135

• 能源地质与工程 • 上一篇    下一篇

济阳坳陷太古宙基岩储层特征及油气成藏模式

穆星1(), 孟涛1, 石泉清1, 李继岩1, 刘鹏1, 方正伟1, 赵贤2, 牛花朋2   

  1. 1.中国石油化工股份有限公司胜利油田分公司勘探开发研究院,山东 东营 257015
    2.中国石油大学(北京) 地球科学学院,北京 102249
  • 出版日期:2025-06-10 发布日期:2025-07-03
  • 作者简介:穆 星,男,博士,高级工程师,1968年出生,主要从事复杂储层预测与油气地质综合研究工作。Email:muxing.slyt@sinopec.com
  • 基金资助:
    中国石油化工股份有限公司研究项目“济阳坳陷太古界潜山油气成藏条件及目标评价”(P22067)

Archean Basement Rock Reservoir Characteristics and Hydrocarbon Accumulation Model in Jiyang Depression

MU Xing1(), MENG Tao1, SHI Quanqing1, LI Jiyan1, LIU Peng1, FANG Zhengwei1, ZHAO Xian2, NIU Huapeng2   

  1. 1. Research Institute of Petroleum Exploration and Development, Sinopec Shengli Oilfield Company, Dongying, Shandong 257015, China
    2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
  • Published:2025-06-10 Online:2025-07-03

摘要: 济阳坳陷太古宙基岩是目前渤海湾盆地油气勘探重点之一,但针对该地区基岩储层特征及油气成藏条件研究尚不成熟。本文基于岩心观察、薄片鉴定的基础上,结合常量元素分析、XRD、扫描电镜、核磁共振和井震资料分析,对济阳坳陷太古宙基岩的储层发育特征及油气成藏的有利地质条件进行研究。结果表明,济阳坳陷太古宙基岩储层岩石类型主要为花岗岩类、辉长岩类、长英质片麻岩类、斜长角闪岩类、碎裂岩类;发育风化壳型、内幕型储层;风化壳型以半风化带物性最好,储集空间为溶蚀孔、溶蚀缝、构造裂缝以及溶蚀扩大缝,储层孔隙度集中在2.2%~3.8%,渗透率均值为2.79×10-3 μm2,成像测井缝密度均值为1.4条/m,以Ⅱ类储层为主,Ⅰ类次之;内幕型储集空间以构造裂缝为主,其次为少量溶蚀孔缝,孔隙度主要分布在1.1%~1.9%,渗透率均值为1.69×10-3 μm2,成像测井缝密度均值为0.6条/m,以Ⅲ类储层为主,Ⅱ类次之;埕北地区基岩储层临近黄河口生烃凹陷,油气沿太古宙基岩潜山顶部不整合面和构造断裂运移,上覆下古生界寒武系—奥陶系碳酸盐岩、新生界古近系沙三和沙四的泥岩提供有效封堵,最终油气在新近纪上新世明化镇期(3.0~1.5 Ma)于基岩顶部风化壳、内幕裂缝内聚集成藏。该研究成果对济阳坳陷基岩的油气勘探具有重要的意义。

关键词: 济阳坳陷, 太古宙, 基岩储层, 成藏模式

Abstract:

Archean basement rock in Jiyang Depression has gradually become one of the focuses of hydrocarbon exploration. At present, the research on the characteristics of basement rock reservoir and the conditions of hydrocarbon accumulation in this area is not mature. On the basis of core observation, thin section identification, macroelement analysis, XRD, scanning electron microscopy, nuclear magnetic resonance and well seismic data analysis, the development characteristics of Archean basement rock reservoir and favorable geological conditions for hydrocarbon accumulation in Jiyang Depression are studied. The results show that the rock types of Archean basement rock reservoir in Jiyang Depression are mainly granites, gabbro, felsic gneiss, plagioclase amphibolite and cataclastic rock. Developed weathered crust type and inside type reservoir; The physical properties of the weathered crust are best in the semi-weathered zone, and the reservoir space is the solution pore, solution fracture, structural fracture and solution expansion fracture. The porosity of the reservoir is concentrated in 2.2%~3.8%, the average permeability is 2.79×10-3 μm2, and the average density of imaging logging fractures is 1.4 bars/m. The weathering crust is dominated by Class Ⅱ reservoirs, followed by class Ⅰ reservoirs. The inside type reservoir space is dominated by structural fractures, followed by a small number of dissolution fractures, with porosity ranging from 1.1% to 1.9%, average permeability of 1.69×10-3 μm2, and average density of imaging logging fractures of 0.6/m, which is dominated by Class Ⅲ reservoirs, followed by class Ⅱ reservoirs. The basement rock reservoir in Chengbei area is adjacent to the hydrocarbon-generating depression of the Yellow River Estuary, and hydrocarbon migrated along the top unconformity and tectonic fault of the Archean basement rock buried hill, overlying the lower Paleozoic Cambrian-Ordovician carbonate rocks, and the mudstones of the Paleogene Sha3 and Sha4 provide effective sealing. Finally, hydrocarbon accumulated in weathering crust and inside fractures at the top of basement rock during the Ming Huazhen period (3.0~1.5 Ma) of Neogene Pliocene. The research results are of great significance to the hydrocarbon exploration of basement rock in Jiyang Depression.

Key words: Jiyang depression, Archean, basement reservoir, hydrocarbon accumulation model

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