川东北开江—梁平海槽两侧长兴组生物礁储层差异性研究

发布时间：2018-04-01 14:13

本文选题：川东北地区　切入点：长兴组　出处：《成都理工大学》2015年硕士论文

【摘要】：针对四川盆地上二叠统长兴组生物礁储层前人进行了大量的综合研究,并在沉积相、岩相古地理特征、储层特征、成藏条件等方面取得了重大的研究进展。但是对四川盆地北部地区上二叠统长兴组的台缘生物礁储层进行微相精细刻画相对较少且缺乏系统性。本文以现代岩石学、沉积学、层序地层学和储层地质学等理论为指导,以川东北长兴组台缘生物礁为研究对象,通过对不同野外露头剖面及长兴组发育的台地边缘生物礁精细分析,解释不同生物礁发育特征,建立不同地区生物礁发育模式。通过对野外剖面生物礁的GR实测,结合钻井GR曲线,对不同地区和微相生物礁的测井响应特征进行了研究,并分析了测井响应的差异性,建立了生物礁不同微相储层的识别模式。对长兴组台缘、台内礁不同微相孔隙类型、物性特征等进行了精细分析,深入研究了开江—梁平海槽两侧生物礁、生物礁不同微相储集空间、物性参数的差异,分析了生物礁储层发育的主要控制因素,进而分析了生物礁不同微相储层发育演化特征。论文取得了如下主要成果和认识:(1)通过海槽两侧台缘生物礁沉积微相分析,认为海槽东侧多期次生物礁更发育,礁体规模较为均一,连片性更好,且普遍向海槽进积发育,白云岩化强烈。海槽西侧发育大规模的单个礁体,但总体分布不均,生物礁以加积为主。(2)海槽两侧生物礁储层的差异性,主要表现为:储集岩石类型的差异、储集空间的差异、储层物性的差异、储层的测井响应特征的差异。差异性分析表明,海槽西侧的元坝和龙岗地区,礁坪物性最优,礁核次之,礁基相对较差,并且各微相孔渗具有较好相关性。海槽东侧则以礁前和礁坪物性较好,礁核、礁基次之。不同地区生物礁储层特征表现为海槽东侧各微相物性总体优于海槽西侧的元坝和龙岗地区。(3)开江—梁平海槽两侧生物礁储层发育的主控因素主要表现为:沉积相是台缘生物礁储层形成的物质基础,成岩作用决定了储层发育演化的质量,构造破裂作用对储层具有建设性和破坏型双重影响。其中,对生物礁储层物性影响最大的是白云石化作用和溶蚀作用。(4)白云石化作用对长兴组碳酸盐岩储层的改造作用明显,白云岩岩石结晶程度高,具中粗晶结构,生物骨架孔、溶孔及晶间孔丰富,具有理想的储集条件。溶蚀作用可以改变储层的孔隙类型和孔隙结构,增加储层的孔隙度。(5)海槽不同台缘带云化程度存在明显差异,表现为:海槽西侧礁坪云化程度相对较强,岩石类型可见颗粒灰岩、具残余结构云岩和晶粒云岩;礁核云化程度较浅,岩石类型以灰岩为主;礁基岩性以泥晶生屑灰岩为主,粒间主要为泥晶填隙。海槽东侧礁坪晶粒白云岩多见,礁核以礁云岩为主,礁基云化程度相对较弱,主要为灰质云岩和云质生屑灰岩,泥晶填隙为主。
[Abstract]:A large number of comprehensive studies have been carried out on the reef reservoirs of the Changxing formation of the Upper Permian in Sichuan Basin, and great progress has been made in sedimentary facies, lithofacies and paleogeography, reservoir characteristics and reservoir forming conditions.However, the microfacies fine characterization of the upper Permian Changxing formation in the northern part of Sichuan basin is relatively few and lack of systematicness.Guided by the theories of modern petrology, sedimentology, sequence stratigraphy and reservoir geology, this paper studies the reef in the platform margin of Changxing formation in northeastern Sichuan.Based on the detailed analysis of the reef on the terrace edge of different outcrop profiles and Changxing formation, the developmental characteristics of different reefs were explained and the development models of reefs in different areas were established.The logging response characteristics of bioreefs in different areas and microfacies were studied by measuring gr of field profile and combining with drilling gr curves, and the difference of log response was analyzed.The identification pattern of different microfacies reservoirs in reef was established.Based on the detailed analysis of the pore types and physical properties of different microfacies in the platform margin and reef of Changxing formation, the differences between the two sides of the reef, the different microfacies storage space and the physical parameters of the reef are studied in depth.The main controlling factors of reef reservoir development are analyzed, and the development and evolution characteristics of different microfacies reservoirs are analyzed.By analyzing the sedimentary microfacies of the reef on the two sides of the trough, it is concluded that the multi-stage reef in the eastern side of the trough is more developed, the scale of the reef is more uniform, the continuity is better, and the reef is generally developed to the trough.Dolomitization is intense.On the west side of the trough, a large scale single reef is developed, but the overall distribution is uneven. The difference of the reef reservoirs on both sides of the trough is mainly composed of accretion and accumulation. The difference of reservoir rock type and reservoir space is the main manifestation of the difference of reservoir rock type and reservoir space.The difference of reservoir physical property and logging response of reservoir.The difference analysis shows that in Yuanba and Longgang areas in the west side of the trough, the physical properties of reef flat are the best, the reef core is the second, the reef base is relatively poor, and the microfacies porosity and permeability have good correlation.In the east side of the trough, the physical properties of the front reef and reef flat are better, the reef core and reef base are the second.The main factors controlling the development of reef reservoirs on both sides of Kaijiang-Liangping trough are as follows: sedimentary facies.It is the material foundation of the formation of the reef reservoir in the margin of the Taiwan platform.Diagenesis determines the quality of reservoir development and evolution, and structural rupture has both constructive and destructive effects on reservoir.Among them, dolomitization and dissolution have the greatest influence on the physical properties of the reef reservoir. The dolomitization has obvious effect on the transformation of carbonate reservoir of Changxing formation. The dolomite has a high degree of crystallization, medium coarse crystal structure and biological skeleton pore.The solution pore and intergranular pore are abundant and have ideal reservoir conditions.Dissolution can change the pore type and pore structure of the reservoir and increase the porosity of the reservoir. (5) there are obvious differences in the clouding degree of different platform margin zones in the trough, which shows that the degree of cloud formation in the reef flat is relatively strong in the west side of the trough.The rock types can be seen as granular limestone with residual structure dolomite and grain dolomite; the reef core is relatively shallow and the rock type is dominated by limestone; the reef bedrock is dominated by argillaceous clastic limestone with intergranular intergranular filling.In the eastern side of the trough, the grain dolomite is more common, the reef core is dominated by reef dolomite, and the reef base is relatively weak, mainly composed of gray dolomite and dolomite, and mudstone filling.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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