剑阁—元坝地区须三段致密砂岩储层特征研究
发布时间：2018-12-28 19:45
【摘要】：本研究区的须三段地层是一套储层基质物性差、非均质性强、致密性高、气藏复杂的砂泥岩互层,目前处于勘探早期。本文在前人研究成果的基础上,充分利用钻井取心、扫描电镜、铸体薄片、测井、录井、测试和化验分析等资料,针对研究区须三段的沉积特征、砂体分布特征、储层特征、成岩作用、致密化进程等方面进行了研究,最终对研究区影响储层发育的因素进行了分析。研究认为,剑阁-元坝地区属于扇三角洲-湖泊的沉积环境,主要发育了扇三角洲前缘亚相、滨浅湖亚相,有利的沉积微相为水下分流河道微相、河口坝微相以及一部分席状砂微相;岩石类型主要为细粒-中粒钙屑砂岩,石英岩屑砂岩次之,还有少量的长石岩屑砂岩,颗粒间的杂基以粘土杂基为主,胶结物以碳酸盐胶结物为主,储集空间类型主要为粒间溶孔、粒内溶孔、粘土杂基微孔;主要成岩作用类型有压实、溶蚀、胶结等作用;成岩作用的成岩阶段处于中成岩B期;储层的致密化时间是J3sn(遂宁组)沉积末期;影响储层发育的控制因素主要有构造作用、沉积作用和成岩作用,沉积作用主要对储层的发育的宏观展布进行控制,溶蚀作用作为建设性成岩作用是该地区层段出现次生孔隙的主要作用之一,压实作用、胶结作用作为破坏性成岩作用,是储层致密的最主要原因。而构造作用作为大区域作用通过大幅度提高储层渗透率而提高油气产能,是储层高产的重要条件。
[Abstract]:The Xu3 formation in this study area is a set of sandstone and mudstone interbeds with poor physical properties, strong heterogeneity, high compactness and complex gas reservoirs, which are in the early stage of exploration. On the basis of previous research achievements, this paper makes full use of the data of drilling coring, scanning electron microscope, casting thin slice, logging, testing and laboratory analysis, aiming at the sedimentary characteristics, sand body distribution characteristics, reservoir characteristics of the three members in the study area. The diagenesis and densification process are studied, and the factors affecting reservoir development in the study area are analyzed. It is considered that the Jiango-Yuanba area belongs to the fan-delta-lake sedimentary environment, which mainly develops the fan delta front subfacies, the shoreside shallow lake subfacies, and the favorable sedimentary microfacies are subaqueous distributary channel microfacies. Estuarine dam microfacies and some sheet sand microfacies; The rock types are mainly fine-grained and medium-grained calcareous sandstone, followed by quartz lithic sandstone, and a small amount of feldspar lithic sandstone. The intergranular complex is dominated by clay complex, and the cementation is dominated by carbonate cementation. The main types of reservoir space are intergranular dissolved pore, intragranular dissolved pore and clay heterogenous micropore. The main diagenesis types are compaction, dissolution, cementation, etc. The diagenetic stage of diagenesis is in stage B of middle diagenesis, and the densification time of reservoir is the end of J3sn (Suining formation). The main controlling factors affecting reservoir development are tectonic, sedimentary and diagenesis, and sedimentary processes mainly control the macroscopic distribution of reservoir development. Dissolution as a constructive diagenesis is one of the main reasons for the formation of secondary pores in this area. Compaction and cementation as destructive diagenesis are the main reasons for reservoir compaction. The tectonism, as a large area action, improves the oil and gas productivity by increasing the permeability of the reservoir, which is an important condition for the high yield of the reservoir.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
本文编号：2394351
[Abstract]:The Xu3 formation in this study area is a set of sandstone and mudstone interbeds with poor physical properties, strong heterogeneity, high compactness and complex gas reservoirs, which are in the early stage of exploration. On the basis of previous research achievements, this paper makes full use of the data of drilling coring, scanning electron microscope, casting thin slice, logging, testing and laboratory analysis, aiming at the sedimentary characteristics, sand body distribution characteristics, reservoir characteristics of the three members in the study area. The diagenesis and densification process are studied, and the factors affecting reservoir development in the study area are analyzed. It is considered that the Jiango-Yuanba area belongs to the fan-delta-lake sedimentary environment, which mainly develops the fan delta front subfacies, the shoreside shallow lake subfacies, and the favorable sedimentary microfacies are subaqueous distributary channel microfacies. Estuarine dam microfacies and some sheet sand microfacies; The rock types are mainly fine-grained and medium-grained calcareous sandstone, followed by quartz lithic sandstone, and a small amount of feldspar lithic sandstone. The intergranular complex is dominated by clay complex, and the cementation is dominated by carbonate cementation. The main types of reservoir space are intergranular dissolved pore, intragranular dissolved pore and clay heterogenous micropore. The main diagenesis types are compaction, dissolution, cementation, etc. The diagenetic stage of diagenesis is in stage B of middle diagenesis, and the densification time of reservoir is the end of J3sn (Suining formation). The main controlling factors affecting reservoir development are tectonic, sedimentary and diagenesis, and sedimentary processes mainly control the macroscopic distribution of reservoir development. Dissolution as a constructive diagenesis is one of the main reasons for the formation of secondary pores in this area. Compaction and cementation as destructive diagenesis are the main reasons for reservoir compaction. The tectonism, as a large area action, improves the oil and gas productivity by increasing the permeability of the reservoir, which is an important condition for the high yield of the reservoir.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
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