柴达木盆地西部南翼山地区新近系油砂山组III-V油组藻灰岩储层特征及控制因素
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中国地质大学(北京)海洋学院

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TE122

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Characteristics and controlling factors of Algal limestone reservoir in Neogene Oil Shashan Formation III-V oil Formation, Nanyishan Oilfield of Western Qaidam Basin
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Ocean Sciences College,China University of Geosciences Beijing

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    摘要:

    柴达木盆地西部南翼山地区新近系湖湘碳酸盐岩发育广泛,其中藻灰岩储层是最优储层。为进一步探索其储层特征及控制因素,通过厘米级别岩心描述、重点井段取样综合分析和测录井资料,对柴达木盆地西部地区南翼山油田新近系油砂山组III-V油组藻灰岩储层进行了研究。研究发现,①油砂山组III-V油组储层有明显的混积特征,以碳酸盐岩为主,平均质量分数40.2%,黏土矿物和陆源碎屑平均质量分数分别为27.8%和23.2%,储层岩性主要以藻灰岩和灰云岩为主,平均体积分数分别为33.6%和42.9%。②藻灰岩分为藻团块灰岩、藻叠层灰岩、藻凝块灰岩三种类型,结构组分主要是藻球粒和内碎屑,其次是藻丝结构、团块、藻屑和黏连组构;灰云岩分为砂质泥晶云岩、颗粒泥晶灰岩和泥晶灰岩三种岩性,主要由颗粒、泥晶基质和胶结物组成。③研究区储层孔隙以溶蚀孔和晶间孔为主,微裂缝发育。藻灰岩以溶蚀孔为主,非均质性强,孔隙中值半径0.085um,细喉道,样品孔隙度23.17%,渗透率54.3md,排驱压力2.97MPa,表现高孔中渗特征。灰云岩孔喉均匀,孔隙中值半径0.039um,微型喉道,样品孔隙度17.24%,渗透率15.13md,排驱压力10.34MPa,表现中孔低渗特征。藻灰岩孔隙结构优于灰云岩,储层质量更高。④研究区储层主要受控与岩性、矿物种类、碳酸盐矿物含量和成岩作用,泥质含量增加会降低储层质量,碳酸盐岩含量与储层质量呈正相关,溶蚀作用与白云石化作用对储层是建设性成岩作用,改善了储层的空间结构,胶结作用会破坏储层结构,降低储层物性。

    Abstract:

    The lacustrine carbonate rocks are widely developed in Neogene, the Nanyishan Oilfield of Western Qaidam Basin, Algal limestone reservoir is the best reservoir. In order to further explore the reservoir characteristics and control factors, the algal limestone reservoir of the Neogene Oil Shashan Formation III-V in the Nanyishan Oilfield was investigated through centimeter-scale core descriptions, key section sampling, and logging data, located in the western Qaidam Basin. Several points were revealed below: (1) The III-V reservoir of N21-N22 exhibits mixed sedimentation, comprising mainly carbonate rocks (40.2% on average), with significant proportions of clay minerals (27.8% on average) and terrigenous clasts (23.2% on average). The predominant lithologies in the reservoir are algae limestone and limestone, constituting 33.6% and 42.9% of the volume fraction, respectively. (2) Algal limestone is categorized into three types: algal mass limestone, algal stromatolite limestone, and algal clot limestone. These variations primarily stem from structural components such as algal spherules, endoclasts, algal filament structures, clumps, algal debris, and cohesive fabric. Meanwhile, limestone was classified into sandy limestone, granular micrite, and micrite, while particles, micrite matrix, and cement were the main components. (3) Dissolved pores and intercrystalline pores dominate the reservoir, with micro-fractures developed. Algae limestone reservoirs exhibit strong heterogeneity, mainly comprised of dissolution pores, with a median pore radius of 0.085 um, small throat size, 23.17% porosity, 54.3 md permeability, and 2.97 MPa displacement pressure, showcasing high porosity and medium permeability characteristics. In contrast, limestone displays uniform pore throats, with a median pore radius of 0.039 um, 17.24% porosity, 15.13 md permeability, and 10.34 MPa drainage pressure, indicating medium porosity and low permeability characteristics. Algal limestone exhibits superior pore structure and higher reservoir quality compared to limestone. (4) Reservoir were mainly controlled by lithology, mineral type and content, and diagenesis. Shale content has negative impacts on reservoir quality, while carbonate rock content correlates positively with reservoir quality. Dissolution and dolomization enhance reservoir spatial structure, while cementation deteriorates reservoir structure and physical properties.

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郭德光,李琦. 柴达木盆地西部南翼山地区新近系油砂山组III-V油组藻灰岩储层特征及控制因素[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-06
  • 最后修改日期:2024-05-28
  • 录用日期:2024-06-05
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