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从区域地质背景出发,通过岩心观察、粒度分析、重矿物和测井曲线等资料的综合分析,对吉林大情字井地区青山口组二段Ⅳ砂组和Ⅴ砂组的沉积背景、物源方向和沉积特征进行了研究,确定其主要为三角洲前缘一前三角洲沉积体系,主要发育了水下分支河道、河口坝、远砂坝和重力流等沉积微相,储油砂体以水下分支河道、河口坝微相为主。编制了Ⅳ砂组和Ⅴ砂组10个小层的沉积微相平面分布图,对砂体的演化规律进行了分析,认为沉积环境为以西南保康水系为主的三角洲前缘相沉积,砂体以水下分支河道和河口坝为主,其中水下分支河道砂体呈南西一北东向展布,向东逐渐减薄,河道的侧向摆动造成了砂体的叠置或切割,形成了条带状和断续分布特征。
Based on the regional geological background, through the comprehensive analysis of core observation, grain size analysis, heavy minerals and well logging curves, the sedimentary background and provenance of the Ⅳ sand and Ⅴ sand groups in the second member of the Qingshankou Formation in the Daqingzijing area, Jilin Province, Direction and sedimentary characteristics of the sedimentary facies. The sedimentary microfacies of submarine delta, sediment microfacies, submarine dams, gravity flow and so on are mainly developed in delta front and front delta sedimentary system. Branches of the river, estuary dam micro phase based. The sedimentary microfacies plane distribution map of 10 sub-layers of Ⅵ sandstone group and Ⅴ sandstone group was compiled and the evolution law of sandstone body was analyzed. The sedimentary environment was believed to be the delta front facies sedimentary mainly by the southwestern Baokang water system. The sand The body is mainly composed of underwater branch channels and dam mouths. Among them, the underwater branch channel sand bodies are distributed in the south-west-northeast direction and gradually decrease in the eastward direction, resulting in the superimposition or cutting of sand bodies caused by the lateral swing of the river channels The banded and intermittent distribution characteristics.