Abstract—

The paper analyzes methods currently used to evaluate the generation parameters of source rocks and suggests a new modified variant of the van Krevelen diagram and an original algorithm for evaluating the hydrocarbon generation properties of bitumen-bearing rocks of the Bazhenov Formation and its analogues. This is done with the application of an integrated approach that employs pyrolitic data on core samples and material-balance calculations. Data on the most probable values of the hydrogen index and the degree of transformations of the original organic matter into naphtides are suggested to use to formally subdivide the possible types of the organic matter into five groups. The paper presents processed analytical data on 340 samples from wells at 13 hydrocarbon fields and three areas in the Khanty–Mansi Autonomous Area and calculated original contents of organic matter in the rocks before naphtide generation was initiated in them, the original and current generation potential values, and the amounts of generated and migrated naphtides. The generation properties of the samples taken at minimum distances from one another (sampling sites spaced 1–3 cm apart) are demonstrated to broadly vary. The broad scatter of the generation properties of the samples cannot be explained only by that they contained organic matter of two types: terra- and aquagenetic. The broad variations in the generation characteristics of the rocks are thought to be likely explained by specifics of their microbial processing and variations in the redox parameters of sedimentation and diagenesis. The two probable reasons for the high S₁/S₂ ratios of the bitumen-bearing rocks are (1) the open porosity of the rocks and (2) active generation and sluggish migration of naphtides generated in these rocks. The very high contents of organic matter of the rocks (up to 40–50% and more) are explained by that they contain epigenetic thiobitumen, which were produced when these rocks were affected by high-enthalpy hydrothermal fluids. The minimum and maximum specific generation of naphtides in rocks of the Bazhenov Formation and its analogues are evaluated (per 1 km², per 25 m rock thickness). The specific migration of naphtides generated in the Bazhenov Formation and its analogues are compared with the specific (per 1 km²) geological hydrocarbon reserves in the Khanty-Mansi Autonomous Area.

中文翻译：

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改进的物料平衡与热解相结合的方法在估算西西伯利亚巴珍诺夫组生烃特性中的应用

摘要-

本文分析了目前用于评价烃源岩生成参数的方法，并提出了van Krevelen图的新修改形式和用于评估Bazhenov组及其类似物的含沥青岩石的生烃特性的原始算法。这是通过采用集成方法来完成的，该方法采用岩心样本上的热解数据和物料平衡计算。建议使用有关氢指数最可能的值和原始有机物转化为核苷酸的程度的数据，以将有机物的可能类型正式细分为五类。本文介绍了在汉提–曼西自治区的13个油气田和3个地区的340口井中处理的分析数据，并计算了开始生成环烷烃之前岩石中有机质的原始含量，原始值和当前产生值，以及生成和迁移的核苷酸的量。相互之间的最小距离（采样点间隔为1-3 cm）采集的样品的生成特性显示出很大的差异。不能仅通过样品包含两种类型的有机物质来解释这些样品的生成特性的广泛分布：土壤和水生。据认为，岩石的生成特征的广泛变化可能是由其微生物加工的特点以及沉积和成岩作用的氧化还原参数的变化所解释的。高S的两个可能原因含沥青岩石的₁ / S ₂比为（1）岩石的开孔孔隙率和（2）在这些岩石中产生的萘化物的活性生成和缓慢迁移。岩石中有机物的含量很高（高达40％至50％或更多），因为它们含有表观遗传的硫沥青，这些硫是在这些岩石受到高焓热液作用时产生的。评估了巴热诺夫组及其类似物在岩石中生成的最小和最大特定萘化物（每1 km ²，每25 m的岩石厚度）。将Bazhenov组及其类似物中生成的核苷酸的特定迁移与特定（每1 km ²）汉-曼西自治区的地质油气藏。