玛湖凹陷风城组云质泥页岩储层成岩作用及其对储层发育的指示意义
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1.中国石油大学北京;2.中国石油大学(北京);3.新疆油田公司勘探开发研究院;4.中国石油新疆分公司勘探开发研究院

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Diagenesis of Dolomitic Shale Reservoir and its Indicative Significance for Reservoir Development in Fengcheng Formation, Mahu Sag
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1.China University of Petroleum,Beijing;2.China University of Petroleum(Beijing);3.Xinjiang Oilfield Company Exploration and Development Research Institute;4.Exploration and Development Research Institute of PetroChina Xinjiang Branch;5.China University of Petroleum (BeiJing)

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    摘要:

    准噶尔盆地玛湖凹陷风城组页岩油资源潜力巨大,无机成岩作用对储层的发育至关重要。然而在成岩过程中受构造运动和深部流体作用等众多因素的综合影响,导致其储层成岩演化过程复杂,成岩作用阶段及其对储层物性的影响尚未明确,限制了页岩油资源的勘探开发。研究针对玛湖凹陷风城组典型云质泥页岩储层,通过薄片鉴定、碳氧同位素、阴极发光、扫描电镜、矿物成分分析等一系列测试手段,查明储层岩石学特征,确定成岩演化环境,明确成岩作用类型及特征,确定成岩矿物溶蚀、胶结和转化关系,厘定成岩序列,确定成岩阶段,恢复成岩演化过程,深入探讨不同成岩作用类型对云质泥页岩储层物性的控制作用。结果表明,风城组云质泥页岩储层为封闭咸水湖泊环境,沉积后经历了机械压实/压溶-溶蚀-多期次胶结-多类型交代综合交替的成岩过程。对储层孔隙度影响较大的成岩作用主要为压实作用、胶结作用和溶蚀作用。其中压实作用和胶结作用是储层物性变差的主要原因,溶蚀作用是改善储层物性的主要成岩作用。研究明确了成岩作用对风城组云质泥页岩储层物性的影响,为风城组泥页岩储层的发育机制研究提供了理论支持,有利于提高页岩油勘探精度。

    Abstract:

    The shale oil resource potential of Fengcheng Formation in Mahu Sag of Junggar Basin is huge. Diagenesis is very important for reservoir development. However, in the process of diagenesis, it is affected by many factors such as tectonic movement and deep hydrothermal fluids, resulting in complex diagenetic evolution process of the reservoir, the diagenesis stage and its effect on porosity reservoir properties are unclear. Which limits the exploration and development of oil and gas resources. In this study, a series of test methods such as thin section identification, carbon and oxygen isotope, cathode luminescence, scanning electron microscopy and mineral composition analysis were used to identify the petrological characteristics of the reservoir, determine the diagenetic evolution environment, clarify the types and characteristics of diagenesis. The relationship between dissolution, cementation and transformation of diagenetic minerals was determined. The diagenetic sequence and diagenetic stage are determined, and the diagenetic evolution process is restored. The controlling effect of different diagenesis types on the physical properties of dolomitic shales has been deeply discussed. The results show that the cloud shale reservoir of Fengcheng Formation is a closed saline lake environment. After the deposition, it experienced the diagenetic process of mechanical compaction/pressure solution-dissolution-multistage cementation-multitype metasomatic synthesis alternated. Compaction, cementation and dissolution are the main diagenesis that have great influence on reservoir porosity. Compaction and cementation are the main reasons for the deterioration of reservoir physical properties, and dissolution is the main diagenesis to improve reservoir physical properties. This study clarified the influence of diagenesis on the physical properties of dolomitic shale reservoir in Fengcheng Formation, which provided theoretical support for the development mechanism of shale reservoir in Fengcheng Formation and was conducive to improving the accuracy of shale oil exploration.

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  • 收稿日期:2022-08-13
  • 最后修改日期:2023-02-16
  • 录用日期:2024-05-25
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