收稿日期: 2015-05-06
修回日期: 2015-11-05
网络出版日期: 2015-11-20
基金资助
国家科技重大专项(编号:2011ZX05000-01-06);2013年中国科学院油气资源研究重点实验室开放基金(编号:Y303KF1YJG);甘肃省重点实验室专项(编号:1309RTSA041)联合资助.
Controlling Factors of Low Permeability Reservoirs of the Triassic Formation in Cheguai Region,Junggar Basin
Received date: 2015-05-06
Revised date: 2015-11-05
Online published: 2015-11-20
以岩心观察和铸体薄片鉴定为基础,结合扫描电镜以及压汞物性等综合资料,对准噶尔盆地车拐地区三叠系储层的岩石学特征、孔隙特征、物性特征及储层物性控制因素进行了研究。研究结果表明:研究区储层岩类以砾岩和砂岩为主,砾岩以砂砾岩为主,砂岩以岩屑砂岩、长石岩屑砂岩为主,偶见岩屑长石砂岩,发育原生孔隙、次生孔隙以及少量的微裂缝,储层以细小孔喉为主,物性总体较差,属于中低孔—中低渗储层.影响碎屑岩储层物性的因素为沉积作用、成岩作用和构造作用.沉积作用影响着储层的基本形态,其对储层的影响主要通过对沉积环境和岩石组构的控制来体现,车拐地区三叠系优质储层主要发育于水动力条件较强、岩石组构特征较好的扇三角洲平原和扇三角洲前缘。研究区储层埋藏较深,成岩作用复杂,主要经历了压实作用、胶结作用和溶蚀作用,其中强压实作用和胶结作用使原生孔隙损失严重,为破坏性成岩作用,而溶蚀作用产生的次生孔隙改善了储层物性,为建设性成岩作用。构造作用产生的微裂缝有效地沟通了孤立孔隙,改善了储层的渗流能力。车拐地区三叠系中低渗储层物性主控因素为沉积作用和成岩作用,其次为构造作用。沉积作用是研究区中低渗储层形成的基础,决定着储层物性的平面展布,成岩作用影响着储层物性在纵向上的延伸,是研究区形成中低渗储层的关键。
陈波,李哲,苏蓓蓓,朱永才,史基安 . 准噶尔盆地车拐地区三叠系相对优质储层主控因素[J]. 天然气地球科学, 2015 , 26(S2) : 73 -82 . DOI: 10.11764/j.issn.1672-1926.2015.S2.0073
Based on core observation and casting thin section,combined with scanning electron microscopy as well as mercury injection property and integrated information,the characteristics of reservoir sandstone,porosity,physical property and controlling factors of the Triassic Formation in Cheguai region,Junggar Basin were studied.The results show that the reservoir rock types in the study area are mainly conglomerate and sandstone,conglomerate dominated glutenite,sandstone types are mainly composed of lithic sandstone and feldspathic litharenite,occasional lithic feldspar sands-tone;Pore types are mainly primary pores and secondary pores,as well as a small amount of micro cracks;Reservoir is characterized by fine pore throat and poor physical property,belonging to low porosity and low permeability reservoirs;Influence factors on physical properties of clastic reservoir are sedimentation,diagenesis and tectonism.Sedimentation effects on reservoir are mainly through the control of the sedimentary environment and rock fabric,which affects the basic layer morphology.High quality reservoir of the Triassic Formation in Cheguai region mainly developed in the strong hydrodynamic conditions and good rock fabric features area which is mainly in fan delta plain and delta front.Diagenesis directly controls the porosity evolution.Reservoir buried deeply in the study area,experienced complex diagenesis,mainly includes:compaction,cementation,dissolution.The primary pore was seriously damaged by strong compaction and cementation,which belongs to the destructive diagenesis.Secondary porosity produced by dissolution improved reservoir properties,which is called as constructive diagenesis.Microfracture produced by the effective communication of isolated pore by tectonic activities,improves the infiltration capacity of reservoir.The reservoir properties of Triassic Formation in Cheguai region are mainly controlled by sedimentation and diagenesis,followed by tectonic.Sedimentation is the foundation of the low permeability reservoir,which determines the planar distribution of reservoir property.Diagenesis affects reservoir physical properties on the longitudinal extension,which is the key to the formation of low permeability reservoir in the study area.
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