摘要
以野外露头、录井描述、岩心、地震资料为基础,利用普通薄片、荧光薄片、分析化验等方法,研究了柴达木盆地红沟子油砂矿的储层特征和成矿因素。结果表明:红沟子油砂矿出露于红沟子构造高点,沿着背斜两翼分布,发育层位为新近系上油砂山组(N_2~1)和下油砂山组(N_2~2);红沟子油砂矿的岩性主要为岩屑长石砂岩和长石岩屑砂岩,石英、长石、岩屑含量为Q38F32R30,整体成熟度较低;储层物性整体随着深度变大而变差,孔隙度为3.10%~38.90%,平均为22.70%,渗透率为0.1×10^(-3)~10.0×10^(-3)μm^2,综合评价为中孔、低渗储层;油砂的含油率随着孔隙度、渗透率的增加而增加,含油率为0.12%~15.55%,平均为2.51%;充足而持续的烃源供给、优质的储层、有效的盖层封闭、盆地高寒缺氧的古气候环境、良好的运移通道和较晚的构造抬升是红沟子油砂成矿的必要因素;孔隙度大于25.00%、渗透率大于1.0×10^(-3)μm^2、砂泥互层配置良好、泥岩层较厚、靠近背斜核部的区域是今后的勘探优选目标。该研究为柴达木盆地西部油砂资源的下步勘探开发提供了依据。
Based on the field outcrop obsm＇vation, logging description, core test and seismic data. ordinary thin- section, fluorescence thin-section, laboratory tests are used to characterize the reservoir and mineralization ele- ments of Honggouzi oil sand in Qaidam Basin. Research demonstrates that the Honggouzi oil sand with Neogene up- per Youshashan （ N21 ） and lower Youshashan formations exposes in the structural high-part and distributes along the both anticlinal legs. The Honggouzi oil sand with relatively low overall maturity is mainly composed by litilic feldspar sandstone and feldspar lithic sandstone. The corresponding contents of quartz, feldspar and cuttings content are Q38F32R30. The reservoir porosity is 3. 10%- 38.90% with 22.70% on averaget the permeability is 0.1×10^-3~10.0×10^-3μm^2. It is comprehensively considered as a medium-porosity and low-peaaneability reservoir with a worse quality trend with buried depth. The oil content is 0. 12% - 15.55% with 2. 51% ola average and it increa- ses with tint increases of porosity and permeability. The mineralization elements of Honggouzi oil sand mainly con- sists of adequate and continuous supply of hydrocarbon source, high-quality reservoir, effective sealing of cap-rock, alpine and anoxic paleoclimate environment, favorable migration channel and late tectonic uplift. The future exploration should focus on the regions with porosity greater than 25.00%, permeability greater than 1.0×10^-3 μm^2 , favorable configuration of sand-mud interbedding and thick mudstone near the anticline core. This research could provide certain reference for the subsequent exploration and development of oil sands in western Qaidam Ba-
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第6期60-65,共6页
Special Oil & Gas Reservoirs
基金
国家自然科学基金"风化作用对烃源岩品质的影响--以柴达木盆地北缘石炭系烃源岩为例"(41602165)
中国地质调查局地质调查项目"柴达木盆地及周缘油气基础地质调查"(DD2016173)
关键词
油砂矿
储层特征
成矿因素
红沟子地区
柴达木盆地
oil sand
reservoir characteristic
mineralization element
Honggouzi
Qaidam Basin
