鄂尔多斯盆地南部上古生界气层测井评价

发布时间：2018-03-23 09:30

本文选题：致密砂岩储层　切入点：测井解释　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本论文以鄂尔多斯盆地南部上古生界储层为例,在结合前人的研究成果的基础上,通过对沉积作用以及成岩作用的分析,利用测井资料、基础地质资料、岩心分析化验资料以及油田实际生产动态等资料,从鄂尔多斯盆地南部上古生界储层的地质特征出发,针对研究区致密砂岩储层的岩性识别、复杂的孔隙结构及其测井响应特征复杂等困难问题进行了研究,取得的成果和认识如下：研究区主要发育两种类型的沉积体系即三角洲沉积体系(盒8段、山1段和山2段)和障壁海岸沉积体系(本溪组)。储层岩性主要有细砂岩、中砂岩、粗砂岩、含砾粗砂岩、细砾岩、中砾岩和砂质砾岩等,其孔隙度主体介于4.0%～12.0%,渗透率在0.01mD～3.0mD之间,属特低孔、特低渗致密型储集层。成岩作用类型多样：主要有机械压实作用、压溶作用、胶结作用和溶蚀作用等,成岩演化复杂。通过采用声波时差建立各小层孔隙度图版,得到实测孔隙度与声波时差回归分析公式,并利用归位后的岩心分析孔隙度对孔隙度解释模型进行检验,认为测井处理孔隙度与归位后的岩心分析孔隙度的平均相对误差均不超过7%；采用密闭取心和测井解释两种方法进行含气饱和度确定,建立各层位含气饱和度分析解释模型。确定研究区气层物性下限和电性下限标准,并对下限标准进行验证,达到下限要求的层位均有气产出,进一步确认气层下限标准符合该地区实际地质情况。
[Abstract]:This paper takes the Upper Paleozoic reservoir in the southern Ordos Basin as an example, based on the previous research results, through the analysis of sedimentation and diagenesis, using logging data, basic geological data. Based on the core analysis data and the actual production performance of the oilfield, based on the geological characteristics of the Upper Paleozoic reservoirs in the southern Ordos Basin, the lithologic identification of the tight sandstone reservoirs in the study area is carried out. The complex pore structure and its logging response are studied in this paper. The results and understandings are as follows: two types of sedimentary system, delta sedimentary system, are mainly developed in the study area. Shan 1 and Shan 2 member) and barrier coast sedimentary system (Benxi formation). The reservoir lithology is mainly fine sandstone, medium sandstone, coarse sandstone, gravel coarse sandstone, fine conglomerate, medium conglomerate and sandy conglomerate, etc., the reservoir lithology is mainly fine sandstone, medium sandstone, coarse sandstone, gravel coarse sandstone, fine conglomerate, medium conglomerate and sandy conglomerate, etc. The porosity of the reservoir is between 4.0 and 12.0, and the permeability is between 0.01mD~3.0mD, which belongs to ultra-low porosity and ultra-low permeability dense reservoir. The diagenesis is of various types: mechanical compaction, pressure solution, cementation and dissolution, etc. The diagenetic evolution is complicated. By using acoustic time difference to establish the porosity chart of each layer, the regression equation of measured porosity and acoustic time difference is obtained, and the porosity interpretation model is tested by the returned core analysis porosity. It is considered that the average relative error of porosity in log processing and core analysis after well logging is less than 7, and gas saturation is determined by means of closed coring and log interpretation. The analysis and interpretation model of gas saturation in each layer is established. The lower limit of physical property and the lower limit of electric property are determined in the study area, and the lower limit standard is verified. It is further confirmed that the lower limit of gas reservoir is in line with the actual geological conditions in the area.
【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】：P618.13;P631.81

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