【作者】 单少鸣；

【导师】 周文； 孙来喜；

【作者基本信息】 成都理工大学 ， 油气田开发地质， 2011， 硕士

【摘要】 鄂尔多斯盆地是我国较大的一个内陆沉积盆地,油气资源非常丰富,具有相当大的勘探开发潜力。子洲气田位于鄂尔多斯盆地东北部伊陕斜坡构造单元,其勘探始于上世纪八十年代,经过二十多年的研究,已成为鄂尔多斯盆地一个重要的产气区。目前,已发现多个气藏,其中山2段气藏是上古生界最为有利开发层段,其中山2³（P₁S₂³）又为山2段中的主力产层段。但目前对于子洲气田山2³段缺乏综合地质特征-测井解释为一体的研究,对于沉积体系和沉积微相展布的认识也不完全统一,使得部份研究结果和气井实际生产特征存在矛盾,如:砂体厚度大、物性好的区域,气井产量却不高等问题。论文针对气田当前存在的问题展开研究,为分类评价及预测该区有利储层提供依据。在岩心观察、钻井、录井、测井、分析化验及测试等资料的分析基础上,开展对子洲地区山西组山2³段储层评价研究。1)在总结前人对研究区沉积相研究成果,利用岩电关系、结合测井曲线形态及组合特征,确定子洲地区山2³段为三角洲前缘沉积:储层主要以水下分流河道为主,且具有砂体厚度大、连续性好及储集性能好等优点,河口坝、席状砂也有一定程度的发育。在对各个沉积微相类型单井识别的基础上,参考了各沉积微相的沉积特征,预测了山2³段沉积相的平面展布。2)通过物性分析、压汞数据、薄片观察可知,山2³段砂岩的平均孔隙度5.59%,平均渗透率为2.66×10^-3 m²,为低孔低渗储层;岩性主要为石英砂岩和岩屑砂岩,通过研究可得,研究区物性随石英含量增加而变好,反之,随岩屑含量增量变差,可见研究区石英砂岩的物性要好于岩屑砂岩;孔隙类型为残余粒间孔、溶蚀粒间孔、粒间溶孔及晶间孔隙及裂缝孔隙,孔喉分选及连通性较差。储层受沉积环境及成岩作用影响,溶蚀作用对储层起贡献作用,压实作用及胶结作用是孔隙度、渗透率降低。3)总结前人研究成果,依据测井参数,总结了适合子洲气田的泥质含量、孔隙度、渗透率等参数的测井解释模型。依据前人的气水识别方法研究对山2³段气水进行了识别。4)根据之前的研究区储层参数结合鄂尔多斯盆地碎屑岩分类标准,将研究区储层划分为三类。综合来看,研究区储层大部分为Ⅱ、Ⅲ类储层。综合储层分布分析、储层物性参数分布及储层分类评价结果,结合研究区气水分布,对子洲地区山2³段储层进行了综合评价,同时划分出了较为有利的区带。更多还原

【Abstract】 Ordos Basin , which is one of the biggest landlocked sedimentary basins and abundant in the gas and oil resources ,has a considerable potential for the exploration. zizhou area is located in the northeastern of Ordos Basin building block,the exploration of this area begins in the 1980s,after more than 20 years of research, zizhou gas filed has become one of the most important gas-producing districts of this area. There are many gas reservoirs has been found in this filed at present, and the second number of Shanxi formation gas reservoir is the optimum exploitation part of upperpalaeozoic, especially the Shan 2³ .However ,the zizhou gas filed Shan 2³’s geology composition-well logging is lack of study, and the opinions of sedimentary systems and sedimentary micro faces distribution are various,which cause the some contradictions between real and theory. For example, the thickness of sand and the physical property of some areas reach the standard, but the production of these areas are not satisfied. The present thesis launch a discussion on problems now existing in the gas reservoirs, and provide some evidences for sorting estimation and beneficial reservoir body prediction.Based on the process of core observation, boing well, well logging, analysis and examination, using he traditional geology research method .this thesis summarize the research findings of this area and its surroundings and launch the estimation of zizhou area Shanxi formation Shan 2³ reservoir.1)Referring to the research findings of sedimentary facies in this area, utilizing the electrical relationship combining the well logging curve to identify that zizhou area Shan 2³ is delta front laydown.the main style of reservoir is subsea distributary channel,it also has the advantages such as thick sandstone ,good continuity and reservoir property, mouth bar、sand sheet also have developed to some extent. On the basis of identifying and referring each microfacies,this thesis predict the seismic facies of Shan 2³ sedimentary fades.2)According to the physical properties, mercury injection data and the observation of cast thin sections, the average porosity of Shan 2³ sandstone is 5.59%,the average permeability is 2.66×10^-3 m²,which means that this area is a low porous, low permeable reservoir, the mean lithogical is quartz sandstone and cuttings sandstone, the research found that the physical property of the study area is better than cuttings sandstone , in contrast , the physical property degrade as the increasing of quartz sandstone. when pore type is residual intergranular pore, corrosion intergranular pore, intercrystal pore ,fracture pore or intergranular dissolution pore, the throat and the continuity are not satisfied. Reservoir is incentive to precipitation surroundings and digenesis, the dissolution makes contribution to reservoir ,the Compaction and cementation make the porosity and the permeability low.3)Concluding the research findings and referring to the well logging data ,this thesis summaries the well logging model ,which is fit for predicting the shale content, the porosity and the permeability data. Identifying the Shan 2³ gas-water based on the gas-water identify method, which provide great evidence for the coming prediction of this area.4)Combining the reservoir data of the study area with classification of the clastic rocks in Ordos Basin. The reservoir of the study area can be divided into three parts. Overall, styleⅡandⅢare the majority part of the reservoir of the study area, integrating the reservoir distribution analysis , reservoir physical property data with Determination of reservoir parameters and Referring to the gas-water distribution of study area in order to give a comprehensive assessment of the reservoir in zihou area Shan 2³ ,besides, make divisions of some Favorable Zones.更多还原