延安气田延气2-延128井区上古生界致密砂岩气测井解释研究

发布时间：2018-01-04 19:28

本文关键词：延安气田延气2-延128井区上古生界致密砂岩气测井解释研究　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本论文以延安气田延气2-延128井区上古生界储层为例,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,从延安气田延气2-延128井区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0.01m D~3.0m D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。确定研究区有效厚度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,进一步确认有效厚度下限标准符合该地区实际地质情况。
[Abstract]:This paper takes the Upper Paleozoic reservoir of Yanan gas extension 2-Yan 128 well area as an example, based on the previous research results, through the analysis of sedimentation and diagenesis, the use of logging data. Based on the basic geological data, core analysis data and actual production performance of oil field, the geological characteristics of Upper Paleozoic reservoir in Yanan gas extension well 2-Yan 128 area are discussed. The difficult problems such as lithology identification, complex pore structure and complex logging response characteristics of tight sandstone reservoirs in the study area are studied in this paper. The results and understandings are as follows: two types of sedimentary system, delta sedimentary system (Box 8), are mainly developed in the study area. The reservoir lithology mainly includes fine sandstone, medium sandstone, coarse sandstone, gravel coarse sandstone, fine conglomerate, medium conglomerate and sandy conglomerate. The main porosity is between 4.0 and 12.0, and the permeability is between 0.01m D and 3.0m. it is very low porosity. The types of diagenesis include mechanical compaction, pressure-solubilization, cementation and dissolution. The diagenetic evolution is complicated. The regression equation of measured porosity and sonic time difference is obtained by using acoustic moveout to establish each layer porosity chart. The porosity interpretation model is tested by the core analysis porosity, and the average relative error between the porosity treated by logging and the core analysis porosity after the logging is less than 7. The gas saturation is determined by closed coring and log interpretation, and the analytical interpretation model of gas saturation in each layer is established, and the lower limit of physical property and the lower limit of electric property of effective thickness in the study area are determined. At the same time, the lower limit standard is verified, and the gas production is found in all the layers that meet the lower limit requirement. It is further confirmed that the lower limit standard of effective thickness accords with the actual geological conditions in this 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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