摘要
综合运用岩心、薄片和X-射线衍射全岩矿物分析等资料,在前人对东营凹陷沙四上–沙三下亚段泥页岩矿物组分成因认识的基础上,根据泥页岩矿物组分的来源和沉积作用,将东营凹陷泥页岩沉积相分为陆源相、混源相和湖源相。根据岩相和泥页岩沉积构造特点,进一步将陆源相划分为层状灰质泥岩亚相和块状灰质泥岩亚相,混源相划分为纹层状混源亚相和层状混源亚相,湖源相划分为膏盐亚相和碳酸盐亚相。东营凹陷沙四上–沙三下亚段泥页岩沉积相:从下至上依次发育湖源膏盐亚相–湖源碳酸盐亚相–纹层状混源亚相–层状混源亚相–纹层状混源亚相–层状混源亚相–陆源层状灰质泥岩亚相–陆源块状灰质泥岩亚相;从东营凹陷南斜坡–东营凹陷北部陡坡带依次发育陆源块状灰质泥岩亚相–陆源层状灰质泥岩亚相–纹层状混源亚相–碳酸盐亚相–膏盐亚相–纹层状混源亚相–层状混源亚相–层状灰质泥岩亚相–块状灰质泥岩亚相。
Based on the data of core, thin section identification and X-ray diffraction, and on the basis of the previous understanding of the origin of shale components in upper Es4-lower Es3 in Dongying depression, according to the source and of sedimentary effect shale component, the sedimentary facies of shale in Dongying depression are divided into land source facies, mixed source facies and lacustrine source facies. According to the characteristics of sedimentary process, lithofacies and shale sedimentary structure, the land-source facies are further divided into layered calcareous mudstone subfacies and massive calcareous mudstone subfacies. The mixed source facies can be divided into laminated mixed subfacies and layered mixed source subfacies, while the lacustrine source facies can be divided into gypsum subfacies and carbonate rock subfacies. Shale sedimentary facies in upper Es4-lower Es3 in Dongying depression: lacustrine source gypsum subfacies-lacustrine source carbonate rock subfacies-laminated mixed facies-layered mixed source subfacies-laminated mixed source subfacies-layered mixed source subfacies-land source layered calcareous mudstone subfacies-land source massive calcareous mudstone subfacies from the bottom to the top;From the south slope zone to the northern steep slope zone of Dongying depression: land source massive calcareous mudstone subfacies-land source layered calcareous mudstone subfacies-laminated mixed facies-carbonate rock subfacies-Gypsum subfacies-laminated mixed source subfacies-layered mixed source subfacies-land source layered calcareous mudstone subfacies-land source massive calcareous mudstone subfacies.
