川北米仓山构造及前缘地区震旦系灯影组深层—超深层储集层特征研究

发布时间：2018-03-12 20:35

  本文选题：米仓山构造及前缘　切入点：深层-超深层　出处：《成都理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以川北米仓山构造及前缘作为研究主体,通过对比川中高磨地区、川西南威远地区震旦系灯影组储层,综合探讨灯影组储层岩石学特征、沉积相、储集空间类型及发育情况、物性特征、成岩作用,并分析四川叠合盆地深层-超深层灯影组优质储层的形成与保存机理,结果表明:四川盆地北缘灯影组划分为开阔台地相和局限台地相,以局限台地相为主,开阔台地相见于福成剖面灯三段,为近滨沉积的一套碎屑岩,局限台地内发育藻云坪、藻砂屑滩、颗粒滩、鲕粒滩和泥云坪。自陡山沱组开始到灯三段结束,大体经历了近滨→潮间→潮下高能→潮间→近滨的环境变化,海平面经历了一次次级升降旋回;而灯四段可见多个潮下-潮间-潮上沉积旋回,以潮下-潮间沉积为主。川北米仓山构造及前缘地区震旦系灯影组岩石类型主要以复杂多样的微生物岩为主,其主要有葡萄石、核形石、泡沫绵层石、包壳颗粒岩、叠层石、凝块石、球粒岩、枝状石和纹层石,以凝块石、葡萄石和纹层石为主,其次为泡沫棉层石和核形石。其中灯四段以发育泥云坪为主的较致密的泥晶白云岩,局部(主要为顶部)发育微生物碳酸盐岩。米仓山及前缘灯影组微生物碳酸盐岩储集层主要分布在灯二段和灯四段,其储集空间类型总结起来共有2个大类和4个小类。其中2大类为:缝洞型储集空间类型和孔隙型储集空间类型,4个小类为:(1)岩溶孔洞(包括溶洞、溶孔);(2)晶间(溶)孔;(3)溶蚀裂缝(包括溶缝和裂缝);(4)粒间(溶)孔(包括砂屑、凝块颗粒间溶孔)。不同层段、不同地区的主要储集空间组合类型亦有所不同。马深1井灯二段孔隙度1.5-4.6%,平均3.3%,渗透率(0.011-0.684)×10-3μm2,平均0.248×10-3μm2;福成剖面灯四段孔隙度0.36-2.76%,平均1.27%,渗透率(0.03-0.164)×10-3μm2,平均0.192×10-3μm2;天星1井灯二段孔隙度为1.71%-4.76%,平均值为3.065%,渗透率为(0.0016-0.0129)×10-3μm2,主要分布于(0.001-0.01)×10-3μm2,平均值为0.0055×10-3μm2。利用马深1井灯影组成岩演化情况为研究主体,归纳研究区内成岩演化序列为:云泥沉积物→颗粒硬化/微生物泥晶化作用→沉积期岩溶作用/白云石化作用→胶结作用/黄铁矿化作用/轻重结晶作用→(构造抬升)-表生岩溶/淡水硅化作用/机械破裂作用→压实、压溶作用/重结晶作用→埋藏期溶蚀(热液作用)/充填作用→压实作用→(米仓山隆升灯影组剥蚀)-有机酸溶蚀硅化/岩溶作用/破裂作用→充填作用。川北米仓山地区-通南巴地区震旦系灯影组优质储层的形成和保存机理主要有:(1)沉积期的微生物岩结构以及准同生期的岩溶作用构成了优质储层发育的基础;(2)桐湾期的表生岩溶作用进一步的扩宽了沉积期岩溶形成的孔缝;(3)优质的缝洞型储层为烃类充注提供了有利通道;(4)灯影组剥蚀释压后对储层的破坏作用。
[Abstract]:Taking the structure and front edge of Micang Mountain in northern Sichuan as the main body of study, the petrological characteristics and sedimentary facies of Dengying formation reservoir of Dengying formation are discussed by comparing the reservoirs of Sinian Dengying formation in Gaomo area of central Sichuan and Weiyuan area in southwest Sichuan. The types and development of reservoir space, physical characteristics, diagenesis, and mechanism of formation and preservation of high-quality reservoirs in deep and ultra-deep Dengying formation in Sichuan superimposed basin are analyzed. The results show that the Dengying formation in the northern margin of Sichuan Basin can be divided into open platform facies and restricted platform facies, mainly limited platform facies, and the open platform meets each other in the third section of the Fucheng section, which is a set of clastic rocks deposited near the coast, and the algal cloud flat is developed within the restricted platform. Algae-sand beach, granular beach, oolitic beach and Niyunping. From Doushantuo formation to the end of the third section of Dengshan, it has generally experienced the near shore. 鈫扵idal intertidal. 鈫扴ubtidal high energy. 鈫扵idal intertidal. 鈫扵he coastal environment changes, the sea level experienced a secondary ascending and descending cycle, and the fourth section of the lamp can be seen in a number of subtidal-intertidal-upper-tidal sedimentary cycle, The rock types of the Dengying formation of the Sinian system in North Sichuan are mainly composed of complex and diverse microbe rocks, which are mainly grape stone, nucleate stone, foam laminate, cladding granular rock, stromatolite, etc. Cementite, spherulitic, dendritic and lamellitic rocks, mainly agglomerate, grapestone and lamellae, followed by foam cottonite and kernelitic stone. Among them, the fourth segment of the lamp is composed of relatively dense mudstone dolomite, which is mainly composed of mud cloud flat. The microbial carbonate rocks developed locally (mainly at the top). The microbial carbonate reservoirs of the Micang Mountain and the Dengying formation are mainly distributed in the second and fourth sections of the lantern formation. The types of reservoir space are divided into two categories and four subclasses, two of which are fracture-cavity type and pore type space type, and four small types are: 1) karst voids (including karst caverns). Intergranular (dissolving) pores (including dissolved fractures and cracks) intergranular (dissolved) pores (including sand debris, condensate intergranular dissolved pores, different layers, The main reservoir space assemblages are also different in different regions. The porosity of the second stage of Maisheng 1 well is 1.5-4.6, with an average of 3.3and a permeability of 0.011-0.684) 脳 10-3 渭 m ~ (2), averaging 0.248 脳 10 ~ (-3) 渭 m ~ (2); the porosity of the fourth member of Fucheng section lamp is 0.36-2.76 (mean 1.27, permeability 0.03-0.164) 脳 10 ~ (-3) 渭 m ~ (2), and the average of Tianxing1 well lamp is 0.192 脳 10 ~ (-3) 渭 m ~ (2), the average is 0.192 脳 10 ~ (-3) 渭 m ~ (2). The porosity is 1.71-4.76, the average value is 3.065 and the permeability is 0.0016-0.0129) 脳 10-3 渭 m2, mainly distributed in 0.001-0.01) 脳 10-3 渭 m2.The average value is 0.0055 脳 10-3 渭 m2. The diagenetic evolution sequence in the study area is as follows: cloud and mud sediments. 鈫扨article hardening / microbial sludge crystallization. 鈫扴edimentary karstification / dolomitization. 鈫扖ementation / pyritization / light and light crystallization. 鈫，

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