准噶尔盆地乌尔禾地区风城组页岩油成藏特征与“甜点”评价

doi:10.3969/j.issn.1006-6535.2025.02.005

摘要/Abstract

摘要： 为明确准噶尔盆地乌尔禾地区风城组页岩油地质特征,通过岩心、薄片观察及地球化学特征等资料,分析了风城组沉积及储集性能,并结合脆性与含油性特征,进行地质、工程双“甜点”评价。研究表明:风城组形成于高盐度闭塞缺氧的还原环境,储集岩类型主要为咸水细粒混积岩,纵向变化复杂,非均质性强,有机质含量垂向差异大,混积岩有机质平均含量为1.22%,干酪根类型以Ⅱ₁型为主,处于成熟—高成熟阶段,咸水条件下生烃潜力高;风城组储集空间以溶蚀孔、微裂缝为主,占比分别为40.00%与39.45%,具有细歪度、分选差、排驱压力变化大、中值压力高等特点,为典型的低孔低渗致密储层,主要含油层岩性为纹层状白云质泥岩及泥质白云岩;一类“甜点”体具有高脆性、高含油面积、物性好、裂缝发育程度高等特点,集中分布于风城组二亚段及三亚段底部,二亚段中上部以二类“甜点”体发育为主。研究结果对准噶尔盆地风城组页岩油开发具有指导意义。

关键词: 沉积环境, 页岩油, 储层特征, “甜点”预测, 风城组, 乌尔禾地区, 准噶尔盆地

Abstract: To clarify the geological characteristics of shale oil in Fengcheng Formation, Urho District, Junggar Basin, this study analyzed the deposition and reservoir performance of the formation based on the core samples, thin sections observation, and geochemical characteristics data, and conducted a dual "sweet spots" evaluation integrating geological and engineering aspects in consideration of brittleness and oil content characteristics. The study results show that: the Fengcheng Formation was deposited in a hypersaline, anoxic, and reductive environment, with the main reservoir rock types being saline fine-grained mixed sedimentary rocks. These rocks exhibit complex longitudinal variations, strong heterogeneity, and significant vertical differences in organic matter content, have an average organic matter content of 1.22%, with type Ⅱ₁ kerogen being predominant, indicating a mature to over-mature stage with high hydrocarbon generation potential under saline conditions. The reservoir spaces in Fengcheng Formation are primarily dissolution pores and micro-fractures, accounting for 40.00% and 39.45% respectively, characterized by fine skewness, poor sorting, large variations in displacement pressure, and high median pressures, typical of low porosity and low permeability tight reservoirs. The main oil-bearing rock types are laminated dolomitic mudstones and argillaceous dolomites. The first class "sweet spots" are characterized by high brittleness, large oil-bearing area, good physical properties, and a high degree of fracture development, mainly distributed at the bottom of the second and third sub-members of Fengcheng Formation, and at the middle and upper parts of the second sub member, the second class "sweet spots" bed primarily develops. The findings of this study have guiding significance for the development of shale oil in Fengcheng Formation of Junggar Basin.

Key words: sedimentary environment, shale oil, reservoir characteristics, "sweet spot"prediction, Fengcheng Formation, Urho District, Junggar Basin

中图分类号:

TE122

宋涛. 准噶尔盆地乌尔禾地区风城组页岩油成藏特征与“甜点”评价[J]. 特种油气藏, 2025, 32(2): 42-50.

SONG Tao. Accumulation characteristics and "sweet spot" evaluation of shale oil in Fengcheng Formation, Urho District, Junggar Basin[J]. Special Oil & Gas Reservoirs, 2025, 32(2): 42-50.

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