摘要:
通过薄片的镜下观察、扫描电镜、能谱分析和物性分析等手段的应用,对吐哈盆地北部斜坡柯柯亚构造中深层储层特征和成因进行了研究。结果表明,柯柯亚构造八道湾组储层几乎全部为碎屑岩,储层主要岩石类型为灰色、深灰色或灰黑色的中厚层状泥质粉砂岩、中-粗砂岩、含砾粗砂岩,普遍含大量碳屑。孔隙类型主要为粒内溶蚀孔和粒间剩余孔。成岩作用主要有压实作用、胶结作用和溶蚀作用。孔渗条件差,为特低孔特低渗类储层。沉积作用是特低孔特低渗储层发育的基础,成岩作用是中深层储层致密化的关键,粒度是储集性能的主控因素。
关键词:
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柯柯亚构造
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中深层
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裂缝
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粒度
Abstract:
The characteristics and genesis of the middle to deep reservoir rocks in the Kekeya structure, Taibei depression, Xinjiang are examined in the light of thin-section examination, SEM, energy spectrum and physical properties. The reservoir rocks in the Badaowan Formation in the Kekeya structure consist almost of clastic rocks, and are characterized by grey, dark grey or greyish black medium-to thick-bedded muddy siltstone, medium-to coarse-grained sandstone and gravel-bearing coarse-grained sandstone with abundant charcoal. The porosity types contain intragranular solution openings and intergranular residual solution openings. The diagenesis contains compaction, cementation and dissolution. These reservoir rocks have extra-low porosity and extra-low permeability caused by the deposition in the study area. The diagenesis is believed to be the key factor for the formation of the dense medium-deep reservoir rocks, and grain sizes are interpreted as main controlling factors for the reservoir quality. The results of research in this paper may provide a reference in improving exploration success in the deep reservoir rocks in China and other parts of the world.
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