| 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组混积岩成因及其孔隙发育特征 |
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| 引用本文： | 王剑,袁波,刘金,李勇,李二庭,马聪,张宝真.准噶尔盆地吉木萨尔凹陷二叠系芦草沟组混积岩成因及其孔隙发育特征[J].石油实验地质,2022,44(3):413-424. |
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| 作者姓名： | 王剑 袁波 刘金 李勇 李二庭 马聪 张宝真 |
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| 作者单位： | 1. 中国石油 新疆油田分公司 实验检测研究院, 新疆 克拉玛依 834000; |
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| 基金项目： | 国家科技重大专项(2017ZX05008-004-008)和新疆维吾尔自治区重点实验室开放课题(2017D04023)联合资助。 |
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| 摘 要： | 以岩性特征差异对混积岩储层孔隙成因的影响作用为主线，从岩石组构与颗粒堆积学的关系角度分析孔隙的成因和特征。研究认为:(1)基于水动力条件、矿物组合和岩石结构特征，并以碎屑颗粒、黏土矿物和碳酸盐类矿物三端元作为划分依据，芦草沟组“甜点”岩性主要有凝灰质砂屑云岩、凝灰质长石岩屑粉细砂岩、凝灰质云屑砂岩及凝灰质云质粉砂岩。混积岩主要为母源混合成因，并且垂向上各类型混积岩层可互层叠置而形成相缘混合。(2)基于颗粒的球形堆积模型，当碎屑颗粒含量低于52.4%时，孔隙度随颗粒含量的增加而减小；当碎屑颗粒含量达到52.4%时，如果碎屑颗粒含量继续增加，粒间孔隙将大量出现，孔隙度将快速增大，逐渐演变为常规的砂岩储层。(3)根据碎屑颗粒、黏土矿物和碳酸盐类矿物三种端元组分与孔隙类型的关系，芦草沟组混积岩的孔隙类型可以划分为粒间孔、粒内溶孔和晶间孔，凝灰质砂屑云岩、凝灰质长石岩屑粉细砂岩的孔隙类型以颗粒支撑的粒间孔和粒内溶孔为主，而凝灰质云屑砂岩及凝灰质云质粉砂岩以晶间孔较发育为特征。混积岩优质储层的发育主要受碎屑颗粒组分含量控制，易溶碎屑组分含量及溶蚀作用对储层物性具有改善作用。
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| 关 键 词： | 混积岩 混积成因 孔隙特征 芦草沟组 吉木萨尔凹陷 准噶尔盆地 |
| 收稿时间： | 2021-12-15 |
Genesis and pore development characteristics of Permian Lucaogou migmatites,Jimsar Sag,Junggar Basin |
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| Abstract: | Taking the influence of lithological characteristics differences on the genesis of pores in migmatite reservoirs as the main line, the genesis and characteristics of pores were analyzed from the perspective of the relationship between rock fabric and grain deposition. (1) Based on hydrodynamic conditions, mineral assemblage and rock structure characteristics, and taking three endmembers of clastic particles, clay minerals and carbonate minerals for classification, the "sweet spots" in the Lucaogou Formation are mainly composed of tuffaceous sandy dolomite, tuffaceous feldspar detrital siltstone, tuffaceous dolomitic sandstone and tuffaceous dolomitic siltstone. The migmatites have mixed sources, and various types of migmatite layers can be superimposed on each other vertically to form facies marginal mixing. (2) Based on the spherical accumulation model, when the content of debris particles is lower than 52.4%, the porosity decreases with the increase of particle content. When the content of clastic particles reaches 52.4%, if the content of clastic particlesJP]continues to increase,large number of ntergranular pores will appear, and the porosity will increase rapidly, gradually evolving into a conventional sandstone reservoir. (3) According to the relationship between the three end components of clastic particles, clay minerals and carbonate minerals and the pore types, the pores of the migmatites in the Lucaogou Formation can be classified into three types including intergranular pore, intragranular dissolved pore and intercrystalline pore. The pores in tuffaceous sandy dolomites and tuffaceous feldspar detrital siltstones are mainly intergranular and intragranular dissolved ones supported by particles, while those in tuffaceous dolomitic sandstones and tuffaceous dolomitic siltstones are mainly intercrystalline ones. The development of high-quality migmatite reservoirs is mainly controlled by the content of clastic particle components, and the content of soluble clastic components and dissolution effect can improve the physical properties of the reservoirs. |
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