鄂尔多斯盆地陕北斜坡东南部长7段致密砂岩油藏成藏物性下限

发布时间：2018-03-21 14:33

  本文选题：致密砂岩储层　切入点：物性下限　出处：《天然气地球科学》2017年02期 　论文类型：期刊论文

【摘要】：成藏物性下限研究可为致密砂岩储层的含油有效性评价提供重要参数,可为资源潜力较大的鄂尔多斯盆地致密油勘探发现提供重要指导。运用录井、测井、试油试采、物性、压汞、流体包裹体、铸体薄片、扫描电镜等资料,综合确认了鄂尔多斯盆地陕北斜坡东南部长7段有效储层物性下限和油气的关键成藏时期,进一步对现今有效储层物性下限进行关键成藏时期以来成岩作用对物性的改变量校正,得到了研究区长7段致密砂岩油气成藏物性下限。结果表明,研究区长7段有效储层孔隙度下限为5.0%,渗透率下限为0.038×10~(-3)μm~2;关键成藏时期主要为早白垩世中晚期,关键成藏时期与现今时期储层物性存在较大差异,研究区Ⅳ_a型、Ⅳ_n型、Ⅴ型3种储层类型在2个时期的物性差异大小平均值分别为5.15%、3.46%、2.32%;研究区Ⅳ_b型、Ⅴ型储层的物性大小多分布在现今有效储层物性下限值附近,这2种储层类型的关键成藏与现今时期孔隙度相差平均为2.79%,进而得到研究区长7段致密砂岩油气成藏孔隙度下限约为7.79%、成藏渗透率下限约为0.10×10~(-3)μm~2。
[Abstract]:The study on the lower limit of physical properties of reservoir formation can provide important parameters for evaluating the oil-bearing effectiveness of tight sandstone reservoir, and provide important guidance for exploration and discovery of tight oil in Ordos Basin with great resource potential. Mercury injection, fluid inclusions, thin sections of casting, scanning electron microscopy and other data have comprehensively confirmed the lower limit of effective reservoir properties and the key oil and gas accumulation period of the 7 member of the southeastern part of the North Shaanxi slope in Ordos Basin. The lower limit of physical properties of present effective reservoir is further corrected by diagenesis since the key reservoir forming period, and the lower limit of hydrocarbon reservoir formation of tight sandstone in the study area of Chang7 formation is obtained. The lower limit of effective reservoir porosity and permeability of Chang7 formation are 5.0 and 0.038 脳 10 ~ (-3) 渭 m ~ (-2) 渭 m ~ (-2) respectively. The key reservoir forming period is mainly the middle and late early Cretaceous, and the key reservoir forming period is different from that of present period. The average values of the physical properties of the three types of reservoirs in the two periods are 5.153.46 and 2.32.The physical properties of the reservoirs of type 鈪，

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