川东卧龙河—板东地区长兴组台内礁滩储层特征及主控因素

发布时间：2018-01-08 13:02

本文关键词：川东卧龙河—板东地区长兴组台内礁滩储层特征及主控因素　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文应用前人研究成果、野外剖面、测井、岩心、薄片、物性、地球化学等资料,以层序地层学、沉积岩石学及碳酸盐储层地质学为理论指导,对川东卧龙河—板东地区上二叠统长兴组台内生物礁滩储层特征、成岩作用及储层发育主控因素进行了系统研究。本次论文主要取得了如下认识:(1)在四川盆地川东地区长兴组顶部发现并证实了风化壳的存在,并构建了风化壳的垂向序列。(2)研究区的野外露头、岩心和薄片资料表明,礁滩相与非礁相地层均受到了表生岩溶作用的改造,本次论文总结了长兴组早成岩期表生岩溶识别标志,包括"花斑状"岩溶系统、垂直溶沟、大型顺层溶洞,岩溶系统中充填角砾、疏松离散的碳酸盐岩砂或粉砂等。研究区礁盖/礁基微相残余生屑细—中晶白云岩具有明显的"花斑状"岩溶系统,储集空间主要为残余粒间(溶)孔、晶间(溶)孔、小型溶洞、溶缝,发育孔隙型和裂缝—孔隙型储层,为区内孔渗性能最好的储集岩类。(3)通过大量文献调研,系统梳理对比了全球多条剖面二叠纪—三叠纪界线(PTB)附近全球海平面升降事件研究进展,研究表明长兴末期存在较长时期的大规模海退,研究区所处的上扬子碳酸盐岩台地发生了大面积暴露,指出了早成岩期表生岩溶是长兴组礁滩型优质储层形成的根本原因;多种白云石化作用均未明显改变储层的孔隙结构,适度白云石化作用形成的抗压、抗溶支撑格架是储层孔隙保存的重要因素;埋藏溶蚀和构造破裂作用对研究区礁滩储层的贡献较小,主要对前期储层进行调整与改造。
[Abstract]:Based on the results of previous studies, field sections, logging, core, thin section, physical properties, geochemical data on sequence stratigraphy, sedimentary petrology and carbonate reservoir geology theory, to the East in East Sichuan Wolong River - two Permian Changxin formation in the reef reservoir characteristics, factors the main development of diagenesis and reservoir were studied. The main results as follows: (1) at the top of the Changxin group in the eastern Sichuan Basin discovered and proved the existence of weathering crust, and the construction of the weathering crust of the vertical sequence. (2) the study area of outcrop, core and slice data show that the reef and non reef strata have been supergene karstification dissolution, this paper summarizes the Changxin formation of the early diagenetic stage of epigenetic karst identification, including "graniphyric" karst system, vertical Grike, large-scale bedding karst, karst filling system Discrete carbonate breccia, loose sand or silty sand. The study area cover / reef reef base microfacies residual bioclastic dolomite and fine - MICROTEK has obvious "graniphyric" karst system, reservoir space is mainly residual intergranular pore, intergranular (karst) (karst) small hole, cave, solution joint development, pore type and fracture pore reservoir, porosity and permeability of reservoir for the region's best performance. (3) through extensive literature research, systematically compared the global Permian Triassic boundary section (PTB) of the global eustatic events near the research shows that the large-scale regression at the end of the Changxin there is a long period, the study area of the upper Yangtze carbonate platform has a large area exposed, pointed out that the early diagenetic stage of epigenetic karst is the fundamental reason of Changxin formation reef formation of good reservoirs; many dolomitization did not obviously change the pore structure of the reservoir, moderate The compressive and anti soluble support grid formed by dolomitization is an important factor for the preservation of reservoir pores, and the contribution of buried dissolution and structural fracturing to the reef Shoal Reservoir is relatively small, which mainly adjusts and improves the previous reservoir.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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