柴达木盆地英西地区湖相混积岩致密储层成岩相类型与测井表征方法
Types and Logging Prediction Methods of Diagenetic Facies in the Tight Reservoir of Mixed Siliciclastic-Carbonate Lacustrine Successions from Yingxi Area, Qaidam Basin
DOI: 10.12677/AG.2019.97069, PDF,  被引量    国家自然科学基金支持
作者: 代全齐, 王贵文*, 范旭强, 贺智博, 赵 星：中国石油大学(北京)油气资源与探测国家重点实验室，北京；中国石油大学(北京)地球科学学院，北京；马丽娟：青海油田勘探事业部，甘肃 酒泉；李亚锋, 伍坤宇：青海油田勘探开发研究院，甘肃 酒泉
关键词: 成岩作用；成岩相；测井表征；储层质量；致密混积岩；Diagenesis； Diagenetic Facies； Well Logs Prediction； Reservoir Quality； Tight Mixed Siliciclastic-Carbonate
摘要: 柴达木盆地英西地区下干柴沟组上段作为一套典型的湖相混积岩致密储层，成岩相的分类特征与测井表征对指导该区的油气勘探具有至关重要的作用。X衍射、薄片和扫描电镜等资料表明，储层矿物类型以白云石、方解石、石英和黏土矿物为主，成岩作用主要分为压实作用、胶结作用、破裂作用和溶蚀作用。根据矿物组分和成岩作用类型与强度，将成岩相划分为成岩微裂缝相、溶蚀相、晶间孔相和压实致密相。其中，压实致密相和晶间孔相发育广泛，成岩微裂缝相和溶蚀相为有利成岩相。含砂或砂质灰云岩有利于成岩微裂缝相的发育，溶蚀相多发育在碳酸盐矿物含量高的层段，普遍发育的泥粉晶碳酸盐矿物和高含量的黏土矿物是导致储层晶间孔相和压实致密相广泛发育的根本原因。在明确成岩相主控因素的基础上，通过挑选成岩相响应敏感的测井参数，运用主成分分析法对成岩相类型进行测井定量表征。结果表明，单井纵向成岩相类型变化频率快，成岩微裂缝相常与构造裂缝伴生，而在无构造裂缝的叠加作用时，溶蚀相物性最好，压实致密成岩相物性最差。
Abstract: The upper section of the Lower Ganchaigou Formation in the Yingxi area of the Qaidam Basin is a typical compact reservoir of mixed Siliciclastic-carbonate Lacustrine Successions. Classification characteristics of diagenetic facies and log characterization are critical to guide oil and gas exploration in this area. The analysis results of X-ray diffraction, thin sections and scanning electron microscopy indicate that the types of reservoir minerals are dominated by dolomite, calcite, quartz and clay minerals. The diagenesis is mainly divided into compaction, cementation, rupture and dissolution. According to the mineral composition and diagenesis type and strength, the diagenetic facies are divided into diagenetic microfracture facies, dissolution facies, intercrystalline pore facies and compacted dense facies. Among them, compacted dense facies and intercrystalline pore facies are widely developed, and diagenetic microfracture facies and dissolved facies are favorable diagenetic facies. Sandy or sandy limy dolostone is favorable for the development of diagenetic microfracture facies. The dissolution facies is mostly developed in the high carbonate minerals. The commonly developed micritic carbonate minerals and high-content clay minerals are the reasons why the intercrystalline pore facies and compacted dense facies developed. On the basis of clarifying the main controlling factors of diagenetic facies, the sensible logging parameters of the diagenetic facies response were selected and characterized by principal component analysis. The results show that the change frequency of the vertical diagenetic facies is fast, and the diagenetic microfractures are often associated with structural fractures. However, in the superposition of no structural fractures, the petrophysical properties of dissolution facies are the best. The compacted lithofacies have the worst petrophysical properties.
文章引用：代全齐, 王贵文, 范旭强, 贺智博, 赵星, 马丽娟, 李亚锋, 伍坤宇. 柴达木盆地英西地区湖相混积岩致密储层成岩相类型与测井表征方法[J]. 地球科学前沿, 2019, 9(7): 645-659. https://doi.org/10.12677/AG.2019.97069

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