赤水地区二叠系及三叠系碳酸盐岩油气储集岩层研究
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摘要
通过岩芯及露头研究 ,结合部分测井资料 ,系统研究了赤水地区二、三叠系储集岩岩石类型及其储集性能 ,主要储集空间类型及孔隙演化特征 ,探讨了各类储层的主要控制因素。研究发现三叠系虽非均质性较强 ,但纵横向上仍有一些可对比的储集层段。如以T2rl1为代表的孔隙型储层。以及以T1c2 1,T1c1为代表的裂缝一孔隙型储层。二叠系储层的存在取决于构造裂缝发育带 ,断层发育带、地震异常带等三有利部位。岩溶储层的发育与否必须考虑到地层厚度的异常变化。三叠系储层主要受控于发育在膏盐层下的潮间带中粒屑滩微相的粒屑云岩的溶蚀作用和白云岩化作用。构造作用同时也促使了白云岩化的发育 ,T1c2 1-T1c11层的白云岩层厚度决定了其储集性能。
Based on the study of rock cores and outcrops, the natures of Triassic-Permian carbonate reservoir in Chishui of Guizhou are made a systematic research, involving the types of reservoir-rocks, main reservoir space, pore evolution and their main controlling factors. Triassic reservoirs are marked by anisotropism, but some reservoir beds could be correlated in vertical and horizontal direction, for example, the pore-reservoir represented by T2r11 and the fissure-pore reservoir by T1c21-T1c1. Permian reservoir are decided by its permeability, which is the process result of the three favorable zones that includes the developing zones of structural fissure, of fault and of seismic anomaly. The development of karst-type reservoir depends on the abnormal change of strata thickness. Triassic reservoirs are controlled by solution and dolomitization of the grain dolostone under the salt-bed. The tectonism strengthen dolomitization, the thickness of dolomitic beds decides the natures of reservoir.
Based on the study of rock cores and outcrops, the natures of Triassic-Permian carbonate reservoir in Chishui of Guizhou are made a systematic research, involving the types of reservoir-rocks, main reservoir space, pore evolution and their main controlling factors. Triassic reservoirs are marked by anisotropism, but some reservoir beds could be correlated in vertical and horizontal direction, for example, the pore-reservoir represented by T2r11 and the fissure-pore reservoir by T1c21-T1c1. Permian reservoir are decided by its permeability, which is the process result of the three favorable zones that includes the developing zones of structural fissure, of fault and of seismic anomaly. The development of karst-type reservoir depends on the abnormal change of strata thickness. Triassic reservoirs are controlled by solution and dolomitization of the grain dolostone under the salt-bed. The tectonism strengthen dolomitization, the thickness of dolomitic beds decides the natures of reservoir.
引文
[1] 马永生,梅冥相,等碳酸盐岩储层沉积学[M ]北京:地质出版社,1999
[2] 叶德胜碳酸盐岩中一种储集空间———微孔隙[J]石油与天然气地质,1992,13(2)
[3] 刘宝沉积岩石学[M ]北京:科学出版社,1979
[4] 陆正元四川盆地下二叠高自然伽马溶洞储层[J]石油学报,1999,20(2)
[2] 叶德胜碳酸盐岩中一种储集空间———微孔隙[J]石油与天然气地质,1992,13(2)
[3] 刘宝沉积岩石学[M ]北京:科学出版社,1979
[4] 陆正元四川盆地下二叠高自然伽马溶洞储层[J]石油学报,1999,20(2)
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