济阳坳陷不同类型页岩油差异性分析  

Difference analysis on different types of shale oils in Jiyang depression

作　　者：宁方兴[1] 

机构地区：[1]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2014年第6期6-9,14,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家"973"计划"陆相页岩油富集要素与有利区预测"(2014CB239104)

摘　　要：济阳坳陷具备形成页岩油气的有利条件,但勘探效果不理想,亟需深入研究。为此,从划分页岩油类型入手,分析不同类型页岩油的差异性。根据页岩油的赋存空间和赋存岩石类型,可将研究区的页岩油划分为泥页岩型和夹层型页岩油2种类型;其中,泥页岩型页岩油可划分为基质型和裂缝型页岩油2个亚类,夹层型页岩油可划分为砂岩夹层型和碳酸盐岩夹层型页岩油2个亚类。提出根据裂缝发育系数划分页岩油类型的方法,将济阳坳陷裂缝发育系数大于0.2的泥页岩型页岩油确定为裂缝型页岩油,裂缝发育系数小于0.2的确定为基质型页岩油。研究区不同类型页岩油在空间分布、流体、物性、储集空间、赋存状态和产能等方面均存在差异。裂缝型页岩油和夹层型页岩油赋存于较大的储集空间,物性较好,赋存状态以游离态为主,因此裂缝型页岩油和夹层型页岩油的产能高于基质型页岩油。夹层型页岩油的储集空间小于裂缝型页岩油,气油比高,因此夹层型页岩油的产能低于裂缝型页岩油。There are advantageous conditions for shale oil and gas accumulation in Jiyang depression, but it should be studied in depthbecause of its poor exploration effect. On the basis of shale oil classification, differences between shale oils were analyzed. Accordingto shale oil storage space and its hosting rock type, 2 shale oil types were divided: mudstone-shale type, interlayer type. Mudstone-shale type includes matrix type and fractured type. Interlayer type includes sandstone interlayer type and carbonate rock interlayertype. Shale oils are defined as fractured type when fracture development coefficient is more than 0.2. Shale oils are defined as matrixtype when fracture development coefficient is less than 0.2. Differences exist in many aspects including shale oil distribution, fluidtypes, physical properties, storage spaces, occurrence states and deliverability of different type shale oils. Fractured type shale oils andinterlayer type shale oils occur in larger storage space with better physical properties and free occurrence state. Therefore, the deliver-ability of fracture type and interlayer type shale oils are higher than that of the matrix type shale oils. The storage spaces for interlayertype shale oils with high gas-oil ratio are less than those for fractured type shale oils. Therefore, the deliverability of interlayer typeshale oils is lower than that of fracture type shale oils.

关 键 词：页岩油 基质型 裂缝型 夹层型 差异性 裂缝发育系数 济阳坳陷 

分 类 号：TE112[石油与天然气工程—油气勘探]