渤海海域白垩系义县组火山岩岩相特征及成储差异
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摘要
以野外露头考察为基础,综合油田钻测井、地震等资料,探索了渤海海域白垩系义县组火山岩喷发模式,总结出不同岩相的井-震响应特征,并明确了岩相控制下的成储差异.研究结果表明:1)研究区火山岩以中、基性岩浆来源为主,具有反序式喷发特征,整体喷发强度较弱,纵向上自下向上发育基性溢流相、中性溢流相、爆发相与火山沉积相;2)爆发相RD/AC小于0.1×0.304 8(Ω·m~2)/μs,CNL大于17%,地震上以杂乱反射为主;溢流相RD/AC大于0.1×0.304 8(Ω·m~2)/μs,CNL小于于17%,地震资料上具有连续的低频强振幅响应,基性溢流相自然伽马低于60API,密度大于2.7g/cm~3,同时较中性溢流连续性更好,波阻抗更高;火山沉积相RD/AC小于0.06×0.304 8(Ω·m~2)/μs,CNL大于17%,具有连续的中高频、弱振幅反射;3)火山岩岩相控制了孔隙演化过程及裂缝的发育程度,爆发相原生孔隙保存较好,同时溶蚀孔隙发育,以孔隙型储集空间为主;中性溢流相脆度大,裂缝发育,以孔隙-裂缝复合型为主,两者为研究区的主要优质储集岩相,而基性溢流相原生孔隙后期多被充填,成储能力最差.
Based on the field geological investigation,combined with the drilling,well logging and seismic data,an eruptive model of the Yixian formation of Cretaceous volcanic rocks was established,the well logging and seismic response was cleared,and the controlling effect on reservoir-forming differences of lithofacies was studied.The results show that:1)The magma of the study area is mainly neutral-basaltic which erupted weakly and with the characteristic of reverse order.From bottom to top,basic effusive facies,intermediate effusive facies,eruptive facies and volcanic sedimentary facies are developed;2)With RD/ACless than 0.1×0.3048(Ω·m~2)/μs and CNLbigger than 17%in well logging data,the eruptive facies have middle amplitude and chaotic reflection configuration in seismic profile.With the same characteristic of RD/ACbigger than 0.1×0.304 8(Ω·m~2)/μs and CNLless than 17%in well logging data,and continuous low frequency,strong amplitude in seismic profile,the basic effusive facies have bigger density(bigger than 2.7 g/cm~3)and lower gamma(less than 60 API)in well logging and better continuance and wave impedance in seismic data.With RD/ACless than 0.06×0.304 8(Ω·m~2)/μs and CNLbigger than 17%,volcanic sedimentary facies have middle to high frequency,weak amplitude in seismic profile;3)Controlled by volcanic lithofacies,the porous reservoirs in eruptive facies and porous-fractured reservoirs in intermediate effusive facies are the main high quality reservoirs in the study area,and the basic effusive facies is hard to form good reservoirs for the packing action of the primary pores.
Based on the field geological investigation,combined with the drilling,well logging and seismic data,an eruptive model of the Yixian formation of Cretaceous volcanic rocks was established,the well logging and seismic response was cleared,and the controlling effect on reservoir-forming differences of lithofacies was studied.The results show that:1)The magma of the study area is mainly neutral-basaltic which erupted weakly and with the characteristic of reverse order.From bottom to top,basic effusive facies,intermediate effusive facies,eruptive facies and volcanic sedimentary facies are developed;2)With RD/ACless than 0.1×0.3048(Ω·m~2)/μs and CNLbigger than 17%in well logging data,the eruptive facies have middle amplitude and chaotic reflection configuration in seismic profile.With the same characteristic of RD/ACbigger than 0.1×0.304 8(Ω·m~2)/μs and CNLless than 17%in well logging data,and continuous low frequency,strong amplitude in seismic profile,the basic effusive facies have bigger density(bigger than 2.7 g/cm~3)and lower gamma(less than 60 API)in well logging and better continuance and wave impedance in seismic data.With RD/ACless than 0.06×0.304 8(Ω·m~2)/μs and CNLbigger than 17%,volcanic sedimentary facies have middle to high frequency,weak amplitude in seismic profile;3)Controlled by volcanic lithofacies,the porous reservoirs in eruptive facies and porous-fractured reservoirs in intermediate effusive facies are the main high quality reservoirs in the study area,and the basic effusive facies is hard to form good reservoirs for the packing action of the primary pores.
引文
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