四川盆地高石梯东部地区震旦系灯影组微生物白云岩储层特征及成因

发布时间：2018-05-20 08:44

本文选题：微生物岩 + 微生物白云岩　；参考：《天然气地球科学》2017年08期

【摘要】：四川盆地高石梯东部地区上震旦统灯影组微生物碳酸盐岩是重要的天然气产层。结合区域地质研究,通过岩心观察、镜下鉴定,对研究区微生物碳酸盐岩岩石学、成岩作用类型及序列展开系统研究,明确了储集空间特征,探讨了储层发育主控因素。上震旦统灯影组微生物碳酸盐岩以白云岩为主,岩石类型主要包括叠层石、球粒岩、凝块石和泡沫绵层白云岩。微生物白云岩储层主要发育于灯四上段、灯四下段和灯二段,储集空间类型以发育窗格孔、空腔溶洞、粒间溶孔、晶间溶孔和铸模孔为特征,优质储层段孔隙度一般在1%~6%之间,渗透率一般小于1×10-3μm2。微生物白云岩储层发育的控制因素主要包括原始岩石类型和成岩作用。原始沉积岩石中的微生物结构决定了储层的储集空间类型和孔隙结构特征;成岩作用是储层是否发育的关键因素,建设性成岩作用包括早期微生物白云石化作用、埋藏溶蚀作用与岩溶作用;破坏性成岩作用主要包括过度白云石化作用和硅化作用。
[Abstract]:The microbial carbonate rock of Dengying formation of Upper Sinian is an important natural gas producing layer in the eastern area of Gaoshiti, Sichuan Basin. Combined with regional geological research, through core observation and microscopic identification, the authors systematically studied the lithology, diagenesis types and sequences of microbial carbonate rocks in the study area, identified the characteristics of reservoir space and discussed the main controlling factors of reservoir development. The microbial carbonate rocks of the Dengying formation of the Upper Sinian are dominated by dolomite. The rock types mainly include stromatolites, spherulites, clots and foam dolomite. The microbial dolomite reservoir is mainly developed in the upper segment of the fourth section of the lamp, the lower segment of the lamp and the second section of the lamp. The reservoir space type is characterized by the development pane hole, the cavity, the intergranular dissolved pore, the intergranular dissolved pore and the mold pore. The porosity of the high quality reservoir is generally between 1% and 6%. The permeability is generally less than 1 脳 10 ~ (-3) 渭 m ~ (2). The main controlling factors of microbial dolomite reservoir development include primitive rock types and diagenesis. The microorganism structure in the original sedimentary rocks determines the reservoir space type and pore structure characteristics, diagenesis is the key factor for reservoir development, and constructive diagenesis includes early microorganism dolomitization. Burial dissolution and karstification and destructive diagenesis mainly include excessive dolomitization and silicification.
【作者单位】：中国石油勘探开发研究院;
【基金】：国家科技重大专项(编号2016ZX05004) 中国石油股份公司科技重大专项(编号:2014E-32-01)联合资助
【分类号】：P618.13

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