黄骅坳陷中区和北区沙河街组陆相页岩气形成条件及资源潜力

发布时间：2018-12-12 11:51

【摘要】：以黄骅坳陷中区和北区古近系沙河街组湖相富有机质泥页岩为重点研究对象,在大量样品实验测试数据深入分析与镜下观察的基础上,从页岩的发育特征、有机质丰度、有机质类型、热演化程度及储集性能等方面出发,明确了研究区沙河街组陆相页岩气形成条件及资源潜力。研究区沙河街组有效生烃泥页岩的累积厚度大(大于1 000 m),有机质丰度高(大于1.0%),有机质类型适中(以Ⅱ_1及Ⅱ_2型为主),热演化程度以成熟—高熟为主,储集性能较好,具备良好的页岩气成藏条件。通过与美国主要产气页岩、中国陆相和海相页岩层段的主要特征参数指标相比较,建立了以富有机质泥页岩的厚度、有机碳含量、镜质组反射率、埋深及地层压力等参数作为页岩气有利区的评价标准,初步优选歧口凹陷西南部及张巨河一带为页岩气勘探的有利区,且以沙三段为页岩气富集的最有利层段。初步估算黄骅坳陷中区和北区沙河街组陆相泥页岩形成的页岩气总远景资源量约为0.46×10~(12)m~3,其中沙三段占73%,充分表明了黄骅坳陷中区和北区沙河街组陆相页岩气资源潜力较大。
[Abstract]:Taking the Huanghua depression central area and the northern Paleogene Shahejie formation lacustrine facies rich organic matter shale as the research object, based on the massive sample experimental test data thorough analysis and the microscopic observation, from the shale development characteristic, the organic matter abundance, Based on the types of organic matter, thermal evolution and reservoir properties, the formation conditions and resource potential of continental shale gas in Shahejie formation are determined. In the study area, the effective hydrocarbon generating shale of Shahejie formation has a large cumulative thickness (> 1 000 m), organic matter abundance (> 1.0%) and moderate organic matter type (鈪，

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