白河区吴50井、资源6井、吴45井区油藏评价

发布时间：2018-06-10 21:25

本文选题：可采储量 + 注采井网　；参考：《西安石油大学》2015年硕士论文

【摘要】：白河区位于鄂尔多斯盆地陕北斜坡,吴起县吴仓堡西,约25 km2,延长组油藏主要含油层位为长4+5油层组和长8油层组,油藏规模小,具隐蔽性,勘探难度大,目前地层压力降低,产能降低,含水率较高。针对目前的勘探开发现状和存在的主要问题,需加大力度研究长4+5油层组和长8油层组的含油情况,包括沉积微相和砂体展布研究、储层微观特征和非均质性研究;本文在基础地质研究的基础上进行油藏开发方案设计,确定设计原则、开发方式、开发层系、井网井距、单井日产、日注能力、合理压力保持水平、方案部署及指标预测,进一步扩大油田的生产规模。根据研究得到如下成果:1.本区长4+5、长8储层主要为特低孔、特低渗储层。本区油藏的形成和分布也都受鼻状隆起控制,油藏主要受岩性控制,构造对油藏的控制作用很小,本区属于未饱和岩性油藏,原始驱动类型为弹性溶解气驱动。2.长4+5、长8储层非均质性较强,为中等到强非均质性,影响储层非均质性的因素主要有沉积微相、碎屑成分与结构和储层中发育的裂缝和微裂隙。本区研究认为油层有效厚度的起算厚度为0.4m;夹层起扣厚度为0.4m;孔隙度的分布主要采用测井解释孔隙度,采用容积法计算地质储量,长4+51、长4+52、长81油层水驱采收率预测采收率为:21.9%、22%、21.17%,得到本区油层可采储量为160.91×104t。3.白河油区主体主体采用菱形反9点注采井网形式;通过优化设计,建议研究层段主体网为:井距460m、排距130m,井排方向为北东68o的不规则菱形反九点注采井网。综合应用初期单井产能、目前单井产能、视流度法,对白河油区长4+5、长81油层的产能评价,所得结果为0.89t、1.56t。4.白河油区的合理地层压力应该保持在17.16MPa。长4+5油层平均地层破裂压力为25.33MPa,合理流压为5.69 MPa,最低流压为4.26 MPa,合理生产压差为9.29MPa左右;长8油层的平均地层破裂压力为24.5MPa,合理流压为5.29 MPa,最低流压为3.98MPa,合理生产压差为9.55MPa左右。
[Abstract]:The Baihe area is located on the northern slope of Shaanxi in Ordos Basin, Wuqi County, Wucangbao West, about 25 km ~ 2. The main oil-bearing layers of Yanchang formation reservoir are Chang 45 reservoir and Chang 8 reservoir. The reservoir size is small, the reservoir is hidden, and the exploration is difficult. At present, formation pressure is reduced, productivity is reduced, water content is high. In view of the present situation of exploration and development and the main problems, it is necessary to study the oil content of Chang 45 and Chang 8 reservoirs, including the distribution of sedimentary microfacies and sand bodies, the microscopic characteristics and heterogeneity of reservoirs. On the basis of basic geological research, this paper designs reservoir development schemes, determines design principles, development methods, development layers, well spacing, daily production per well, daily injection capacity, reasonable pressure level, plan deployment and index prediction. Further expand the production scale of oil fields. According to the study, the following results were obtained: 1. The reservoir of Chang 8 is mainly very low porosity and very low permeability reservoir. The formation and distribution of the reservoir in this area are also controlled by nose uplift, the reservoir is mainly controlled by lithology, and the structure has little controlling effect on the reservoir. The area belongs to the unsaturated lithologic reservoir, and the original driving type is elastic dissolved gas drive .2. The reservoir heterogeneity of Chang 45 and Chang 8 is relatively strong, which is medium to strong heterogeneity. The main factors affecting reservoir heterogeneity are sedimentary microfacies, clastic composition and structure, and fractures and microfractures developed in the reservoir. It is considered that the starting thickness of effective reservoir thickness is 0.4 m, the starting thickness of intercalation is 0.4 m, the porosity distribution is mainly interpreted by logging, and the geological reserves are calculated by volume method. The oil recovery of Chang 451, Chang 452and Chang81 oil reservoir is predicted to be 1: 21.9and 222.17. the recoverable reserves of reservoir in this area are 160.91 脳 104t.3. The main body of Baihe oil area adopts the form of rhombic inverse 9 point injection-production well pattern, and through the optimization design, it is suggested that the main body network of the study interval is 460m well spacing, 130m row distance, and the irregular rhombic reverse nine-point injection-production pattern with the direction of north east 68o. In the early stage of application, the productivity of single well is evaluated by the method of apparent mobility, and the result is 0.89 t / 1.56t.4. The reasonable formation pressure in Baihe oil area should be kept at 17.16 MPA. The average formation fracture pressure of Chang 45 reservoir is 25.33 MPA, the reasonable flow pressure is 5.69 MPA, the lowest flow pressure is 4.26 MPA, and the reasonable production pressure difference is about 9.29 MPA; The average formation fracture pressure of Chang 8 reservoir is 24.5 MPA, the reasonable flow pressure is 5.29 MPA, the lowest flow pressure is 3.98 MPA, and the reasonable production pressure difference is about 9.55 MPA.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE34

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