吴起油田王洼子区块长6储层特征研究

发布时间：2018-06-06 03:33

  本文选题：鄂尔多斯盆地 + 长61油层亚组　； 参考：《西安石油大学》2015年硕士论文

【摘要】：吴起油田王洼子区块位于陕西省吴起县西部,构造位置处于鄂尔多斯盆地的伊陕斜坡西部边缘,长6油层组是本区主力产油层。根据岩性、电性特征,进一步将长6油层组划分为长61、长62、长63、长64个油层亚组,在地层对比的基础上,建立了全区统一的地层格架。王洼子区块长6油层总体构造格架为一平缓的西倾单斜,在西倾单斜上发育较小幅度的鼻状构造。根据本区区域沉积背景、砂体平面分布形态、岩石类型、测井曲线等分析确定,研究区长6油层组属于三角洲前缘亚相,进一步划为水下分流河道、水下分流间湾、河口坝以及前缘席状砂4类沉积微相。通过砂地比等值线图、砂体分布图等进一步分析了长6油层组中长61、长62、长63以及长64油层亚组的沉积微相类型及展布特征。长61为主力油层,对长61储层进行详细分析评价。岩心观察、室内岩石薄片镜下鉴定、分析测定等表明研究区长61油层组储层砂岩主要是浅灰色细粒长石砂岩和岩屑质长石砂岩,孔隙类型以粒间孔隙为主,储层砂岩己达中成岩A阶段的中晚期-中成岩B阶段的早期。长61油层组储层物性较差,主要为一套特低孔-超低渗储层。长61油层组储层的层内非均质性较强。综合研究分析,根据储层分类标准,长61储层为Ⅳa或Ⅳb类储层。
[Abstract]:The Wangwa sub-block of Wuqi Oilfield is located in the western part of Wuqi County, Shaanxi Province. The structural position is located on the western edge of the Yishan slope in the Ordos Basin. The Chang 6 oil formation is the main oil producing layer in this area. According to the lithology and electrical characteristics, Chang 6 oil formation is further divided into Chang 61, Chang 62, Chang 63 and Chang 64 reservoirs. On the basis of stratigraphic correlation, a unified stratigraphic framework is established. The overall tectonic framework of Chang 6 reservoir in Wangwazi block is a gentle westward tilting monocline with a relatively small rhinoid structure developed on the westward tilting monocline. According to the regional sedimentary background, sand body plane distribution, rock type, logging curve, etc., the Chang 6 oil formation in the study area belongs to delta front subfacies, which is further divided into underwater distributary channel and underwater distributary bay. Estuarine dams and front matting sand four types of sedimentary microfacies. The sedimentary microfacies types and distribution characteristics of Chang-6 oil formation subformations Chang61, Chang62, Chang63 and Chang64 are further analyzed by means of the sand-land ratio isoline map and sand body distribution map. Chang61 is the main reservoir, the Chang61 reservoir is analyzed and evaluated in detail. Core observation, microscopic identification, analysis and measurement of reservoir sandstone of Chang61 formation in the study area show that the reservoir sandstones are mainly light gray fine-grained feldspathic sandstone and lithic feldspathic sandstone, and the pore types are mainly intergranular pores. Reservoir sandstone has reached the middle-late-middle diagenetic stage B of the middle diagenesis A stage. The reservoir physical properties of Chang61 reservoir group are poor, mainly a set of ultra-low porosity and ultra-low permeability reservoirs. Reservoir heterogeneity of Chang 61 reservoir is strong. According to the criteria of reservoir classification, Chang 61 reservoir is classified as 鈪，

本文编号：1984872