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中国页岩油资源潜力巨大,而页岩油的可动性评价影响了该类资源的勘探与开发。本文提出一种泥页岩油可动资源量评价方法,具体包括以下内容:1划分泥页岩层系,识别标准为:起始段和结尾段为大于2m的泥页岩段,单层泥页岩内有机质成熟度(RO)和有机碳均值大于0.5%,单层砂岩厚度小于2m,10m范围内薄砂层累计厚度小于4m,总厚度≥30m,页岩油可动资源量评价是针对狭义的泥页岩;2页岩饱和吸附油量评价模型,是基于泥页岩体积(展布、厚度)、有机碳、泥页岩密度和饱和吸附系数4个参数建立的;3原地页岩油资源量评价模型,是依据页岩含油率、泥页岩体积、岩石密度及轻烃重烃补偿系数4个参数建立的;4页岩油可动资源量评价模型,结合物质平衡原理,页岩油可动资源量等于原地页岩油资源量减去页岩油饱和吸附油量。应用上述方法对东濮凹陷古近系沙河街组沙一段、沙三上亚段、沙三中亚段、沙三下亚段泥页岩层系内页岩油资源量进行评价,结果为:沙一段、沙三上亚段、沙三中亚段及沙三下亚段泥页岩层系内页岩油可动资源量分别为1.27×108t、4.27×108t、2.73×108t和2.59×108t,柳屯洼陷具有很大的勘探潜力。
The potential of shale oil resources in China is huge, while the evaluation of shale oil mobility affects the exploration and development of such resources. This paper presents a method for evaluating the amount of mobile shale oil resources, including the following: 1. Divided into shale formations, the identification criteria are: Shale section with initial section and ending section of more than 2m, The maturity of organic matter (RO) and organic carbon in the rock are greater than 0.5%, the thickness of single-layer sandstone is less than 2m, the cumulative thickness of thin sand layer is less than 4m and the total thickness is greater than 30m within 10m. Mud shale; 2 shale saturated oil adsorption evaluation model is based on shale volume (distribution, thickness), organic carbon, shale density and saturation adsorption coefficient established by the four parameters; 3 original shale oil The resource evaluation model was established based on four parameters: shale oil content, shale volume, rock density and light hydrocarbon heavy hydrocarbon compensation coefficient. The evaluation model of 4 shale oil mobile resources, combined with the material balance principle, The amount of oil mobile resources is equal to the amount of shale oil resources in place of shale oil saturation adsorption oil. The above methods were used to evaluate the amount of shale oil in the Shalei Formation, Sha3 Upper Member, Middle Sha3 Member and Sha3 Lower Member shale formation of the Paleogene Shahejie Formation in the Dongpu Depression. The results are as follows: The mobilized resources of shale oil in the first shale, upper third sandstone, middle third sandstone and lower third sandstone shale formation are 1.27 × 108t, 4.27 × 108t, 2.73 × 108t and 2.59 × 108t, respectively Tuen depression has great exploration potential.