济阳坳陷页岩油富集主控因素

济阳坳陷页岩油类型包括泥页岩型和夹层型2种类型。在分析泥页岩型和夹层型页岩油特征的基础上,通过数理统计、典型解剖、分析测试技术和生排烃模拟实验,明确了济阳坳陷页岩油富集的主控因素。泥页岩型页岩油富集的主控因素是:泥页岩岩相、异常高压、页岩油的可动性和泥页岩(微)裂缝;富有机质纹层状岩相的异常高压过渡段的页岩油可动性好,裂缝越发育越有利于济阳坳陷页岩油的富集。夹层型页岩油富集的主控因素与常规油藏类似,主要受物性和异常高压控制;夹层的物性越好,异常压力越高越有利于夹层型页岩油的富集。该成果对中国东部陆相断陷盆地页岩油勘探有一定指导作用。

The main control factors of shale oil enrichment in Jiyang depression

There are two types of shale oil in Jiyang depression, i.e., mud-shale type and interlayer type. Through analyzing shale oil characteristics of these two types, the main control factors of shale oil enrichment in Jiyang depression were identified using mathematical statistics, typical anatomy, analysis and testing technology as well as hydrocarbon generation and expulsion simulation experiment. The main control factors for mud-shale type include mud-shale lithofacies, abnormally high pressure, shale oil mobility and mud-shale (micro) fissures. In abnormally high pressure transition segment of organic-rich laminated lithofacies, the better the mobility of shale oil is and the more developed the fissures are, the more beneficial it will be for the enrichment of shale oil in Jiyang depression. The main control factors for interlayer type are similar to those of conventional oil reservoirs, i.e., primarily controlled by physical properties and abnormally high pressure. The better the physical properties of interlayers are and the higher the abnormal pressure is, the more beneficial it will be for the enrichment of interlayer-type shale oil. These results have certain guiding significances for shale oil exploration in terrestrial rift basins of eastern China.