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通过钻井、测井、古生物等资料的综合分析 ,应用陆相层序地层学理论对卫城油田卫 81断块沙四段进行高分辨率层序地层学研究。依据岩性、构造、古生物、测井等标志将沙四段划分出 1个三级层序 ,2个体系域、4个准层序组和 18个准层序。其中 ,沙四下段为低水位体系域 ,主要发育洪水 -漫湖沉积体系 ;沙四上段为湖侵体系域 ,主要发育湖泊三角洲沉积体系。烃源岩为沙四上段的暗色泥岩 ,储集层为沙四上段的湖泊三角洲砂体和沙四下段的洪水流砂体
Through the comprehensive analysis of drilling, well logging and paleontology data, the terrestrial sequence stratigraphy theory is applied to study the high-resolution sequence stratigraphy of the Es4 member of Wei-81 fault block in the Wei-Cheng oilfield. According to lithology, tectonic, paleontology, logging and other marks, the Sha 4 Member is divided into 1 third-order sequence, 2 systematic domains, 4 quasi-sequence groups and 18 quasi-sequence sequences. Among them, the lower part of Sha 4 is a low-water system tract, mainly developing flood-diffuse lake sedimentary system; the upper part of Sha 4 is a lake invasion system tract, mainly developing lacustrine delta sedimentary system. The source rocks are dark mudstones of the upper part of Sha 4, and the reservoirs are the lacustrine deltaic sand bodies in the upper part of Sha 4 and the flood flow sand bodies in the lower part of Sha 4