【作者】 刘建伟；

【导师】 张哨楠；

【作者基本信息】 成都理工大学 ， 矿产普查与勘探， 2010， 硕士

【摘要】 2000年以来,塔河油田西南部多口井钻遇东河砂岩段,岩性以灰白色石英砂岩、岩屑石英砂岩为主且油迹发育层段多,测井解释最高油气柱超过60m。东河砂岩段是塔里木盆地下古生界在经历海西早期运动构造变形,长期遭受剥蚀、夷平之后,晚泥盆世海侵形成的海岸陆屑超复沉积。本文主要采用薄片、岩芯、测井等资料,对塔河油田西南部东河塘组沉积相和储层特征进行了较为详细的研究,研究结果表明:1.塔河油田西南部上泥盆统东河塘组属滨岸沉积体系,存在前滨、后滨、临滨等6种微相。2.通过单井的沉积微相划分和联井剖面的对比发现,以临滨、前滨为主要类型的砂体在空间展布上较稳定,应加强对这些部位的进一步勘探。3.从厚度上看,东河塘组储层非常发育,西北砂体厚度大,向东南变薄,储层中主要发育粒间孔,有较好的孔渗条件,为Ⅱ类较好的储集岩。4.用Kridge法作了该区东河塘组储层厚度分布等值线图,为评估储层的厚度分布提供了定量数据,从而确定出研究区西部和西北部有较好的勘探前景。总之,塔河地区叠加在奥陶系油气藏之上的上泥盆统东河砂岩段具有良好的勘探前景,既是塔河油田外围新的勘探评价层系,也是塔河油田新的油气勘探领域,为扩大油气勘探成果,增储上产,寻找塔河地区新的后备基地具有重要的现实意义。更多还原

【Abstract】 Donghe Sands, a sands body within Donghetang Formation of Later Devonian, had been discovered in several wells in southwestern Tahe Oilfield since 2000, it was mainly composed of light-gray quartzose and lithic quartzose sandstones, the interpreted column filled hydrocarbon was over 60 m with the evidence of wireline-log data, and hydrocarbon indications occur frequently in the drilling. It was overlain an unconformity which was resulting from long period erosion of the uplifted Northern Tarim basin due to the Early Hercynian orogeny during the time of transgression in Later Devonian.By use of the data of thin section and core, we make a detailed study about sedimentary facies and reservoir characters. The results show that:1. 6 microfacies including foreshore, backshore, shoreface and a beach sedimentary system have been identified from the Upper Devonian of the southwest of Tahe oilfield.2. microfacies of single well and contrast of microfacies of adjacent wells have been ascertained, we find that the sand body mainly with foreshore and shoreface is comparably stable in space, so we should attach great importance to the exploitation in these region.3. Judging from the thickness, the reservoir is developed,Northwest sand thick and thin to the southeast, the reservoir has development intergranular pore, has a good porosity and permeability conditions for better reservoir of ClassⅡrock.4.By use of the method of Kridge, we make a forecast of thickness and distributing of the reservoir. It provide quantificational data to evaluate the thickness of reservoir, and it shows that the west and southwest of the research region have better interests for exploitation.In all,the Donghe Sands overlain the oil pools of Ordovician have a good prospection for oil exploration, and it can to be the new domain and succession for expanding of Tahe Oil Field.更多还原