红山嘴油田石炭系火山岩储层裂缝发育特征及主控因素

doi:10.3969/j.issn.1006-6535.2021.03.004

摘要/Abstract

摘要： 红山嘴油田石炭系火山岩是典型的孔隙-裂缝性双重介质储层,裂缝是影响油气运聚成藏和富集高产的重要因素,也是制约研究区火山岩油气勘探的关键。为了实现石炭系火山岩油藏的高效开发,综合岩心、薄片、成像测井资料,在火山岩储层裂缝特征分析的基础上,分析影响裂缝发育的主控因素。结果表明:石炭系火山岩裂缝以构造缝为主,其次为成岩缝和风化缝;构造缝以高角度缝和低角度斜交缝最发育;存在近东西、北西和北北东向3组裂缝,以小尺度缝和微缝为主,是不同期次构造运动的产物。裂缝的形成和分布受岩性、风化壳、断层和成岩作用控制,不同岩性火山岩矿物组成差异导致其裂缝类型及孔缝组合迥然不同,风化强度差异控制了风化壳内风化缝的形成及溶蚀缝的发育;断层活动影响了伴生裂缝走向和分布,距断层越近裂缝线密度越高;成岩作用充填、改造早期原生裂缝的同时形成一定的次生溶蚀缝,加剧了火山岩储层裂缝的非均质性。研究结果对准噶尔盆地西北缘石炭系火山岩油藏的有效开发具有指导意义。

关键词: 裂缝特征, 影响因素, 石炭系, 火山岩储层, 构造运动, 红山嘴油田

Abstract: Carboniferous volcanic reservoir in Hongshanzui Oilfield is a typical pore-fractured dual media reservoir. Fracture is an important factor affecting hydrocarbon migration, accumulation, concentration and high yield, and also a key to restricting volcanic reservoir exploration in the study area. In order to achieve the efficient development of Carboniferous volcanic reservoirs, the main controlling factors affecting fracture development were identified based on the analysis of fracture characteristics of volcanic reservoirs, in combination with core, slice, and imaging logging data. The results showed that The fractures of Carboniferous volcanic rocks were mainly tectonic fracture, followed by diagenetic fracture and weathered fracture. Among tectonic fractures, high-angle fracture and low-angle oblique fracture were most developed. There were three groups of fractures in nearly east-west, northwest, and north-north east directions, dominated by small fractures and micro fractures, which were generated by different tectonic movements. The formation and distribution of fractures were controlled by lithology, weathered crust, faults and diagenesis. The difference in mineral composition of different lithological volcanic rocks resulted in different fracture types and pore-fracture combination modes. The difference in weathering intensity controlled the formation of weathered fracture and the development of dissolution fractures in the weathered crust. Fault activity affected the strike and distribution of associated fractures. The closer to the fault, the higher the density of fractures was. The early primary fractures were filled and reconstructed under the action of diagenesis, intensifying the fracture heterogeneity of volcanic reservoir. The study results play a guiding role in the effective development of Carboniferous volcanic reservoir in the northwestern margin of Junggar Basin.

Key words: fracture characteristics, influencing factors, Carboniferous, volcanic reservoir, tectonic movement, Hongshanzui Oilfield

中图分类号:

TE122.2

张兴勇. 红山嘴油田石炭系火山岩储层裂缝发育特征及主控因素[J]. 特种油气藏, 2021, 28(3): 25-32.

Zhang Xingyong. Fracture Development Characteristics and Main Controlling Factors of Carboniferous Volcanic Reservoir in Hongshanzui Oilfield[J]. Special Oil & Gas Reservoirs, 2021, 28(3): 25-32.

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