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常规-非常规油气协同发展引发储集体类型的多样性,品质整体变差,孔隙结构更为复杂,亟需建立相对统一的孔隙结构评价方案,为储层评价与甜点区优选提供技术支持。基于岩石孔隙结构解剖,提出“孔隙结构四分法”评价方案,将孔隙系统分为毫米孔(大于1mm)、微米孔(1~1 000μm)、亚微米孔(100~1 000nm)及纳米孔(小于100nm);明确了不同类型孔隙系统发育位置、流体作用力及流动机理,建立了对应的分析评价技术。解剖了克拉2气田巴什基齐克组常规砂岩、新安边油田长7段致密砂岩、川中大安寨段介壳灰岩、川南龙马溪组页岩4类储层,明确了各储层类型孔隙结构的差异性及不同级别孔隙所占比例,探讨了孔隙结构对储层物性、资源经济性及开发工艺的影响;孔隙结构分级研究需与储层有效性评价紧密结合,特征尺度决定流体相态与作用力,影响流体可动性及油气开发工艺。进一步加强孔隙分级评价关键界限值的研究,完善孔隙结构表征技术的融合,建立孔隙结构与岩性和产能的定量关系是未来研究的重点。
The conventional-unconventional oil and gas synergistic development leads to the diversity of reservoir types, the overall deterioration of the quality and the more complicated pore structure. Therefore, it is urgent to establish a relatively unified pore structure evaluation scheme to provide technical support for reservoir evaluation and dessert area optimization. Based on the anatomy of the pore structure of rock, the evaluation scheme of “four-point pore structure” is proposed. The pore system is divided into millimeter (greater than 1mm), micropore (1-1000μm), submicron (100-1000nm) (Less than 100nm). The developmental positions, fluid forces and flow mechanisms of different types of pore systems were clarified. Corresponding analytical and evaluation techniques were established. The conventional sandstone in the Bashijiqi Formation in the Kela-2 gas field, the tight sandstone in Chang 7 section of Xin’Abian Oilfield, the crustal limestone in Daanzhai Section of Central Sichuan Basin and the 4 types of shale in Longmaxi Formation in southern Sichuan Basin were dissected, and the pore structure of each reservoir type And the different proportions of pores, the influence of pore structure on reservoir physical properties, resource economy and development process is discussed. The study of pore structure classification needs to be closely integrated with reservoir validity evaluation. The characteristic scale determines the phase behavior of fluid Force, affecting fluid mobility and oil and gas development process. It is the focus of future research to further strengthen the research on the critical critical value of pore grading evaluation, to improve the integration of pore structure characterization techniques and to establish the quantitative relationship between pore structure and lithology and productivity.