吴起油田38井区长6储层综合评价

发布时间：2017-12-28 19:07

本文关键词：吴起油田38井区长6储层综合评价　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：吴起油田38井区位于鄂尔多斯盆地二级构造单元陕北斜坡中南部。本论文主要研究长6油层,由于研究区地质条件较复杂,含油层位多,横向、纵向非均质性都很强,油藏规模大,因此对研究区长6储层进行综合评价,为后续开发方案调整提供依据。研究区长6油层处于三角洲沉积环境,属于三角洲前缘亚相沉积,发育水下分流河道、河道侧翼及分流间湾微相,其中水下分流河道在研究区为砂体的主要沉积环境。长6油层的岩性主要为浅灰色、灰绿色、灰色中粒长石砂岩和细粒长石砂岩。其成岩作用类型主要有压实及压溶作用和胶结作用。孔隙类型以粒间孔-溶孔组合型为主。长6油层孔隙度平均值为10.0%,长6油层渗透率平均值为0.54×10-3μm2。长6油层层内非均质性强,层间及平面非均质性表现一般。根据研究区储层特征,选取渗透率、孔隙度、砂体厚度、排驱压力、中值半径、沉积微相、岩性作为储层评价参数,将研究区储层分为3类,并对各类储层的典型井进行分析。因此选取I、II类储层较多的长61、长62油层组作为进一步开发方案调整的实施层位。
[Abstract]:Wuqi oilfield 38 wells located in Ordos basin two tectonic units of North Shaanxi Slope south. This paper mainly studies Chang 6 oil reservoir. Because the geological conditions of the study area are more complex, the oil bearing zone is more, the lateral and vertical heterogeneity is strong, and the scale of the reservoir is large. Therefore, the reservoir length of Chang 6 reservoir is comprehensively evaluated, which provides a basis for the adjustment of subsequent development plan. The Chang 6 reservoir is located in delta sedimentary environment. It belongs to delta front subfacies deposition, and develops underwater distributary channel, channel flank and distributary Bay microfacies. The underwater distributary channel is the main sedimentary environment of sand body in the study area. The lithology of the Chang 6 reservoir is mainly light gray, gray green, gray medium feldspar sandstone and fine feldspar sandstone. The main types of diagenesis are compaction, pressure dissolution and cementation. The type of pore is mainly composed of intergranular pore and dissolved pore combination. The average porosity of the long 6 oil layer is 10%, and the average permeability of the long 6 oil layer is 0.54 * 10-3 Mu m2. In the long 6 reservoir, the heterogeneity is strong, and the interlayer and plane heterogeneity are common. According to the reservoir characteristics in the study area, we selected permeability, porosity, sand body thickness, displacement pressure, median radius, sedimentary microfacies and lithology as reservoir evaluation parameters, and divided the reservoir in the study area into 3 categories, and analyzed the typical wells of various reservoirs. Therefore, the long 61 and long 62 reservoir groups of I and II reservoirs are selected as the implementation layers of the further development scheme adjustment.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE31;P618.13

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