东营凹陷沙四段上亚段—沙三段下亚段泥页岩成岩演化及其对储层发育的影响
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侯中帅(1990—),男,河北邢台人,在读博士研究生,从事沉积学与储层地质学方面的研究。联系电话:15689131801,E-mail:hzsxdz@qq.com。

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国家自然科学基金项目“济阳坳陷泥页岩沉积微相及储层微观结构研究”(41372107)


Diagenesis evolution characteristics of shale in Upper Es4 to Lower Es3 Members in Dongying Sag and its influence on the formation of reservoir
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    摘要:

    为了明确泥页岩的成岩作用类型及其对储层发育的影响,以东营凹陷沙四段上亚段—沙三段下亚段为研究对象,通过岩心观察、岩石薄片观察、扫描电镜观察、能谱分析、X射线衍射分析和元素分析,对其成岩作用类型进行研究;结合有机质的镜质组反射率、岩石热解和伊/蒙混层比等分析,划分成岩阶段,厘定成岩演化序列;最终明确成岩作用对储集空间发育的影响。研究结果表明,东营凹陷沙四段上亚段—沙三段下亚段泥页岩发育有黄铁矿形成、白云石化作用、压实作用、胶结作用、溶蚀作用、重结晶作用、黏土矿物转化和破裂作用等成岩作用类型。成岩演化已到达中成岩阶段A期。黄铁矿形成、白云石化作用、重结晶作用和黏土矿物转化有利于晶间孔的形成,溶蚀作用有利于形成粒内孔,破裂作用可以形成裂缝。

    Abstract:

    In order to clarify the diagenetic types of shale and their effects on shale reservoir development,the shale of Upper Es4 to Lower Es3 Members in Dongying Sag is taken as the research object. The diagenetic type was studied through core and thin section observation,SEM,EDS,XRD,and elemental analysis. The diagenetic stages were divided in combination with analyses on vitrinite reflectance,rock pyrolysis and I/S mixed-layer ratio. Meanwhile,the diagenetic evolution characteristics were also determined and the effects of diagenesis on the spatial development of reservoirs were clarified.The results show that the diagenesis types of the shale of Upper Es4 to Lower Es3 Members in Dongying Sag include formation of pyrite,dolomitization,compaction,cementation,dissolution,recrystallization,clay mineral transformation and rupturing,etc. The diagenetic evolution had been in the middle diagenetic stage A. The formation of pyrite,dolomitization,recrystallization,clay mineral transformation are beneficial to the formation of intercrystalline pores,dissolution is favorable for the formation of grain inner pores,and rupturing can form fractures.

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侯中帅,陈世悦.东营凹陷沙四段上亚段—沙三段下亚段泥页岩成岩演化及其对储层发育的影响[J].油气地质与采收率,2019,26(1):119~128

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  • 在线发布日期: 2019-04-02