松辽盆地民东地区地层划分及沉积环境

民东地区是吉林油田致密油效益储量提交的重要准备区块,但由于勘探与开发资料不对接,多年未开展过系统的沉积研究。以82口探井、评价井资料为基础,以15口取心井为重点,通过重矿物、粒度及岩相、测井相分析手段,结合地震切片和属性提取,综合开展地层划分对比、砂体展布特征及沉积微相研究。研究表明:扶余油层可被划分为1个基准面长期旋回、4个基准面中期旋回和13个基准面短期旋回;物源来自保康水系与怀德水系的混合物源;属于干旱气候下的浅水曲流河三角洲沉积演化模式。

STRATIGRAPHIC DIVISION AND SEDIMENTARY ENVIRONMENTS FOR MINDONG AREA OF SONGLIAO BASIN

Mindong area is the important displacing block for submitting the benefit reserves of the dense oil in Jilin Oilfield,but the exploration and development data are not well matched,so the researches on the sedimentary facieses are not conducted for many years.On the bases of the data of 82 exploring and evaluating wells,focusing on the 15 coting wells,with the help of the analyzing methods such as the heavy minerals,grain size,lithofacies and log facies,integrating with the seismic slice and attribute extraction,the studies on the stratigraphic division and contrast,sandbody spread characteristics and sedimentary microfacieses were engaged comprehensively.The study achievements show that Fuyu oil layers can be divided into one long base-level cycle,4 base-level medium cycles and 13 short datum-level cycles;the mixed source is from Baokang and Huaide drainages;belongs to the delta sedimentary evolutional mode of the shallow meandering river under the arid climate.