Study on Sedimentary Microfacies and Impact on Development of Chang 61 Reservoir in Shijiapan Area, Ordos Basin
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摘要: 重新认识开发中后期油藏的沉积环境、沉积微相及其展布特征，对于查明剩余油分布、后期注采井网设计具有重要的现实意义。通过系统收集和整理研究区的岩心、录井和大量测井资料，对地层进行详细划分，在建立岩电关系基础上，对鄂尔多斯盆地史家畔地区长61油层的沉积微相进行了系统研究。并对研究区历年生产状况、注水受效特征、地层能量等进行统计。结果表明：长61油层属三角洲沉积体系，发育三角洲平原亚相，分流河道和河漫滩构成其主要微相。进一步编制各小层沉积微相平面图，分析长61砂体的沉积特征和沉积微相的平面展布特征，讨论了沉积微相与含油性的关系，以及沉积微相研究对解决目前主要开发矛盾和问题的作用，从而为后期油田开发方案的调整提供可靠地质依据。Abstract: It is of great practical significance to re-recognize the sedimentary environment, sedimentary microfacies and distribution characteristics of the reservoir in the middle and late development stages, which is important for identifying the remaining oil distribution and well deign. By systematically collecting and arranging the core, mudlog and logging data in this studying area, the strata have been divided in detail. On the basis of establishing the relationship between rock and electricity, the sedimentary microfacies of Chang 61 reservoir in Shijiapan area, Ordos Basin have been systematically studied. In addition, the production status over the years, water injection efficiency characteristics and formation energy in this area have been counted and analyzed. The results show that the Chang 61 reservoir is a deltaic sedimentary system, developing deltaic subfacies, with the main microfacies composed by distributary channel and river floodplain. And then, the sedimentary microfacies plan of various layers have been further prepared, the sedimentary characteristics sand body of Chang 61 and the plane distribution characteristics of sedimentary microfacies have been analyzed. Finally, the relationship between sedimentary microfacies and oil-bearing properties, and the role of sedimentary microfacies in resolving major development contradictions and problems at present have discussed which will provide a reliable geological basis for the adjustment of later-stage oilfield development programs.
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Key words:
- development /
- sedimentary microfacies /
- Chang 61 reservoir /
- Shijiapan area /
- Ordos Basin
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