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油气资源结构是指不同类型油气资源量的大小及空间配置关系,其研究结果能为勘探决策提供重要支撑。辽河西部凹陷中北部雷家地区沙河街组四段发育优质烃源岩和多种类型储层,形成常规、非常规石油协同发育,低熟、成熟石油混合聚集特征。在成藏要素综合分析的基础上,研究了雷家地区沙四段常规油、致密油、页岩油空间分布特征。结合盆地模拟法、小面元容积法、EUR分布类比法、体积法估算雷家地区沙四段生烃量、排烃量、滞留量和聚集量,详细研究了沙四段资源定量组成及分布特征,建立沙四段油气资源结构模型。结果表明,雷家地区沙四段以生油为主,页岩油分布在洼陷中心,致密油环绕页岩油分布,常规油聚集在页岩油和致密油分布区外围。缓坡带—洼陷带—陡坡带剖面上,依次分布低熟稠油、低熟—成熟混源致密油、成熟页岩油和成熟常规油。沙四段烃源岩总生油量为12.9×10~8t,总的石油地质资源量为10.45×10~8t。其中,页岩油地质资源量为7.51×10~8t,占比71.9%;致密油地质资源量为2.25×10~8t,占比21.5%;常规油地质资源量为0.69×10~8t,占比6.6%。页岩油、致密油、常规油地质资源量的比例约为11∶3∶1。
The structure of oil and gas resources refers to the size and spatial distribution of different types of oil and gas resources. The results of this study can provide important support for exploration and decision-making. High-quality source rocks and various types of reservoirs are developed in the fourth member of Shahejie Formation in the Leijia area in the central-northern Liaohe West Depression, forming a mixture of conventional and unconventional oil co-development, low-mature and mature petroleum. Based on the comprehensive analysis of the forming elements, the spatial distribution characteristics of conventional oil, tight oil and shale oil in Sha 4 Member of Leijia area were studied. Combined with basin simulation, facet volume method, EUR distribution analogy and volumetric method, the hydrocarbon generation, hydrocarbon expulsion, retention and accumulation in Shahejie Formation of Leijia area were estimated. The quantitative composition and distribution of resources Characteristics of the Shahejie formation of oil and gas resources structural model. The results show that the Shahejie Formation is dominated by oil in the Leijia area, and the shale oil is distributed in the center of the depression. The tight oil surrounds the distribution of shale oil, and the conventional oil accumulates in the periphery of the shale oil and tight oil distribution area. Gentle slope zone - subsidence zone - steep slope zone profiles, followed by distribution of low-mature heavy oil, low mature - mature mixed source tight oil, mature shale oil and mature conventional oil. The total oil production of the source rocks of the fourth member of Shahejiekou Formation is 12.9 × 10 ~ 8t and the total amount of petroleum geological resources is 10.45 × 10 ~ 8t. Among them, the amount of shale oil geological resources 7.51 × 10 ~ 8t, accounting for 71.9%; tight oil geological resources 2.25 × 10 ~ 8t, accounting for 21.5%; conventional oil geological resources for 0.69 × 10 ~ 8t, accounting for Than 6.6%. Shale oil, tight oil, conventional oil geological resources ratio is about 11:3: 1.