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运用岩心观察、薄片鉴定、图像分析及流体包裹体分析等技术手段,对廊固凹陷沙四上亚段储层成岩作用类型进行研究,建立储层成岩作用演化序列。在此基础上重新探讨成岩相的分类命名方案,以成岩作用演化序列为约束,在廊固凹陷沙四上亚段储层中划分4类典型的成岩相组合类型。利用自然伽马、电阻率及声波时差测井曲线特征,采用Fisher典型判别分析确定各成岩相组合类型的定量判别函数,并建立测井参数交会图版。采用铸体薄片鉴定与测井识别相结合的手段,在对典型井段储层成岩体系进行精细分析的基础上,结合沉积相研究,分析廊固凹陷沙四上亚段储层沉积—成岩相组合平面分布规律。研究结果表明,Ⅰ类成岩相组合主要分布于旧州—固安构造带近岸水下扇扇根及部分扇中沉积环境,Ⅱ类成岩相组合主要分布在河西务构造带北部区块辫状河三角洲及旧州—固安构造带近岸水下扇扇缘沉积环境,Ⅲ类成岩相组合类型主要分布在河西务构造带中南部区块辫状河三角洲沉积环境中,Ⅳ类成岩相组合类型主要分布在河西务构造带南部以及柳泉—曹家务构造带南部辫状河三角洲沉积环境中。
Using core observation, thin slice identification, image analysis and fluid inclusion analysis, the types of reservoir diagenesis in the Uppermost Member of Shahejie Formation in the Langgu Sag are studied, and the evolution sequence of reservoir diagenesis is established. On this basis, the classification and naming scheme of diagenetic facies is re-explored. Four diagenetic assemblages of diagenetic facies are divided into four types in the reservoir of the Uppermost Member of Es4 in the Langgu Sag. Using the characteristics of natural gamma ray, resistivity and acoustic time-lapse logging, Fisher discriminant analysis was used to determine the quantitative discriminant function of each diagenetic assemblage, and a cross-plot of logging parameters was established. Based on the detailed analysis of reservoir diagenetic system in a typical well section and the study of sedimentary facies, a method of combining the identification of the thin slab and logging identification is used to analyze the reservoir sedimentary-diagenetic facies Combination of plane distribution law. The results show that the type Ⅰ diagenetic facies assemblages are mainly distributed in the sedimentary environment of the submarine fan fan and part of the fan in the Jiuzhou-Gu’an structural belt, and the type Ⅱ diagenetic facies assemblages are mainly distributed in the braided River delta and old state-Gu’an tectonic belt. The type Ⅲ diagenetic facies assemblages are mainly distributed in the sedimentary environment of the braided river delta in the central-southern Hexiwu-tectonic belt. The combination of Ⅳ diagenetic facies The types are mainly distributed in the southern Hexiwu tectonic belt and in the depositional environment of southern Braided River Delta in the Liuquan-Caojiawu tectonic belt.