东营凹陷泥页岩有利相带定量评价

Quantitative Evaluation for Favorable Facies Zone of Shale in Dongying Depression

摘要: 东营凹陷具有丰富的页岩油资源，2019年以来，东营凹陷多口页岩油井峰值日油超100 t/d，展现了良好的勘探开发前景。综合运用岩心、薄片和分析测试等资料，在前期对东营凹陷沙四上–沙三下亚段泥页岩沉积相、沉积亚相认识的基础上，对东营凹陷泥页岩沉积相、沉积亚相的储集性、含油性、可动性和可压性评价，建立了东营凹陷泥页岩沉积亚相定量评价公式，对泥页岩沉积亚相有利相带进行排队，依次是纹层状混源亚相、层状混源亚相、陆源层状灰质泥岩亚相、湖源碳酸盐亚相、陆源块状灰质泥岩亚相、湖源膏盐亚相。优选出东营凹陷泥页岩有利相带是纹层状混源亚相、层状混源亚相和陆源层状灰质泥岩亚相。首次对东营凹陷泥页岩有利相带进行评价，对济阳坳陷和同等类型陆相断陷盆地页岩油勘探有一定指导意义。

Abstract: Dongying Depression is rich in shale oil resources. Since 2019, the peak daily oil of many shale oil wells in Dongying Depression has exceeded 100 t/d, showing a good exploration and development prospect. Comprehensive use of core, thin slice and analysis test data, on the basis of the earlier stage understanding for shale sedimentary facies and subfacies of Es4u-Es3L of Dongying depression, by reservoir properties, oiliness, mobility and compressibility evaluation of the shale sedimentary facies and subfacies in Dongying depression, quantitative evaluation formula of shale sedimentary subfacies was established. By evaluating favorable phase zones of shale sedimentary subfacies, favorable phase zones are orderly laminated mixed source subfacies, layered mixed source subfacies, land source layered calcareous mudstone subfacies, lacustrine source carbonate subfacies, land source massive calcareous mudstone subfacies, and lacustrine source gypsum subfacies. The favorable facies zone of the shale in Dongying depression is the laminated mixed source subfacies, layered mixed source subfacies and land source layered calcareous mudstone subfacies. The evaluation of the favorable facies zone of shale in Dongying depression for the first time has certain guiding significance for the shale oil exploration in Jiyang depression and the same type of continental fault basin.