元坝地区千佛崖组储层特征及其成岩作用
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摘要
研究川东北元坝地区中侏罗统千佛崖组储层特征,探讨其成岩作用与成岩演化模式。通过薄片观察、物性分析、扫描电镜及阴极发光等测试手段对钻井岩心和露头剖面的147块岩石样品进行分析,结果表明:元坝地区千佛崖组的储层岩石类型以细粒岩屑长石砂岩和细粒岩屑砂岩为主,其次为细粒长石岩屑砂岩。储集空间类型按成因可分为剩余原生粒间孔、次生孔隙和裂缝,次生孔隙可分为粒间溶孔和铸模孔。野外样品和岩心样品皆表现为孔隙度与渗透率较低,但孔渗关系较好。储层经历了压实作用、胶结作用、交代作用、溶蚀作用和自生矿物的沉淀,根据对储层的影响可分为破坏性成岩作用、建设性成岩作用和保持性成岩作用。破坏性成岩作用包括压实作用和胶结作用,建设性成岩作用为溶蚀作用,保持性成岩作用则为自生矿物的沉淀和破裂作用。成岩作用被划分为早成岩阶段A期、早成岩阶段B期、中成岩阶段A期和中成岩阶段B期2个阶段4个期次。
Study of diagenesis and reservoir characteristics of the Middle Jurassic Qianfoya Formation in Yuanba area of Sichuan Basin shows that the main reservoir rock type is fine-grained arkose sandstone and fine lithic sandstone,followed by fine grained feldspathic lithic sandstone.Reservoir space types in terms of genesis can be classified into residual primary intergranular pore,secondary pore and fracture,and the secondary pores can be further divided into intergranular dissolved pore and moldic pore.The porosity and permeability in the rocks are lower,but the relationship between porosity and permeability is well.During the process of rock formation,the reservoir experiences three kinds of diageneses,the destructive diagenesis,the retentivity diagenesis and the constructive diagenesis respectively.There are two stages and four phases for the diagenesis,including early stage A phase and early stage B phase;mid stage A phase and mid stage B phase.
Study of diagenesis and reservoir characteristics of the Middle Jurassic Qianfoya Formation in Yuanba area of Sichuan Basin shows that the main reservoir rock type is fine-grained arkose sandstone and fine lithic sandstone,followed by fine grained feldspathic lithic sandstone.Reservoir space types in terms of genesis can be classified into residual primary intergranular pore,secondary pore and fracture,and the secondary pores can be further divided into intergranular dissolved pore and moldic pore.The porosity and permeability in the rocks are lower,but the relationship between porosity and permeability is well.During the process of rock formation,the reservoir experiences three kinds of diageneses,the destructive diagenesis,the retentivity diagenesis and the constructive diagenesis respectively.There are two stages and four phases for the diagenesis,including early stage A phase and early stage B phase;mid stage A phase and mid stage B phase.
引文
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[2]郭正吾,邓康龄,韩永辉.四川盆地形成与演化[M].北京:地质出版社,1996.Guo Z W,Deng K L,Han Y H.The Formation and Development of Sichuan Basin[M].Beijing:Geological Publishing House,1996.(In Chinese)
[3]曾允孚,夏文杰.沉积岩石学[M].北京:地质出版社,1986.Zeng Y F,Xia W J.Sedimentary Petrology[M].Beijing:Geological Publishing House,1986.(In Chinese)
[4]牛海青,陈世悦,张鹏,等.准噶尔盆地乌夏地区二叠系碎屑岩储层成岩作用与孔隙演化[J].中南大学学报(自然科学版),2010,42(2):749-758.Niu H Q,Chen S Y,Zhang P,et al.Diagenesis and porosity evolution of Permian reservoir in Wu-Xia area,Junggar Basin[J].Journal of Central South University(Science and Technology),2010,42(2):749-758.(In Chinese)
[5]李小燕,王琪,韩元红,等.川东北地区长兴组-飞仙关组礁滩相沉积体系优质储层形成过程及储集空间演化主控因素分析[J].天然气地球科学,2014,25(10):1594-1602.Li X Y,Wang Q,Han Y H,et al.Main control factors and analysis of reservoir space evolution of reefbeach facies in Changxing-Feixianguan Formation of Northeastern Sichuan Area[J].Natrual Gas Gecscience,2014,25(10):1594-1602.(In Chinese)
[6]Loyd S J,Corsetti F A.The origin of the millimeterscale lamination in the Neoproterozoic lower beck spring dolomite:implications for widespread,finescale,layer-parallel diagenesis in Precambrian carbonates[J].Society for Sedimentary Geology,2010,80(10):678-687.
[7]周勇,纪友亮,张善文,等.胶莱盆地莱阳凹陷莱阳组低渗透砂岩储层特征及物性控制因素[J].石油学报,2011,32(4):612-619.Zhou Y,Ji Y L,Zhang S W,et al.Characteristics and controlling factors on physical properties of lowpermeability sandstones of the Laiyang Formation in the Laiyang Sag,Jiaolai Basin[J].Acta Petrolei Sinica,2011,32(4):612-619.(In Chinese)
[8]王婷,侯明才,王文楷,等.川西北九龙山-剑阁地区珍珠冲段储层特征与主控因素探讨[J].山东科技大学学报(自然科学版),2014,33(1):20-26.Wang T,Hou M C,Wang W K,et al.Reservoir characteristics and main controlling factor of Zhenzhuchong Member of Jiulong Mountain and Jiange Area in Northwest of Sichuan Basin[J].Journal of Shandong University of Science and Technology(Natural Science),2014,33(1):20-26.(In Chinese)
[9]Bloch S,Lander R H,Bonnell L.Anomalously high porosity and permeability in deeply buried sandstone reservoirs:Origin and predictability[J].AAPG Bulletin,2002,86(2):301-328.
[10]黄思静,谢连文,张萌,等.中国三叠系陆相砂岩中自生绿泥石的形成机制及其与储层孔隙保存的关系[J].成都理工大学学报(自然科学版),2004,31(3):274-281.Huang S J,Xie L W,Zhang M,et al.Formation mechanism of authigenic chlorite and relation to preservation of porosity in nonmarine Triassic reservoir sandstones,Ordos Basin and Sichuan Basin,China[J].Journal of Chengdu University of Technology(Science&Technology Edition),2004,31(3):274-281.(In Chinese)
[11]王志萍,秦启荣,王保全.川西DY地区致密砂岩储层裂缝特征及其成藏意义[J].断块油气田,2012,19(5):572-576.Wang Z P,Qin Q R,Wang B Q.Fracture characteristics and its hydrocarbon accumulation significance of tight sandstone reservoir in DY region of west Sichuan[J].Fault-Block Oil&Gas Field,2012,19(5):572-576.(In Chinese)
[12]黄可可,黄思静,佟宏鹏,等.长石溶解过程的热力学计算及其在碎屑岩储层研究中的意义[J].地质通报,2009,28(4):474-482.Huang K K,Huang S J,Tong H P,et al.Thermodynamic calculation of feldspar dissolution and its significance on research of clastic reservoir[J].Geological Bulletin of China,2009,28(4):474-482.(In Chinese)
[13]侯明才,窦伟坦,陈洪德,等.鄂尔多斯盆地苏里格气田北部盒8、山1段成岩作用及有利储层分布[J].矿物岩石,2009,29(4):66-74.Hou M C,Dou W T,Chen H D,et al.Study on diagenesis of the He-8Member and Shan-1Member in North the Sulige gas field,Ordos Basin[J].Journal of Mineralogy and Petrology,2009,29(4):66-74.(In Chinese)