迈陈凹陷东部涠三段沉积相研究

Sedimentary facies of Member 3 of Weizhou Formation in eastern Maichen Sag

 施琰 马英俊 陈平 江凡

 （中国石化江苏油田分公司勘探开发研究院，江苏 扬州 225009）

 (Exploration & Production Research Institute, Jiangsu Oilfeild Company, SINOPEC, Yangzhou 225009, China)

 以岩心、钻井、录井、测井及分析化验资料为基础，通过对岩石学特征、原生沉积构造、测井相及地震相等相标志分析，确定迈陈凹陷东部涠三段存在南、北两大沉积体系，北部斜坡带主要为扇三角洲沉积，南部断裂带为近岸水下扇和小型的扇三角洲沉积。该段发育扇三角洲平原、扇三角洲前缘等8种亚相，发育辫状分支河道、漫流沉积、水下分流河道等13种微相。内斜坡西部的三角洲前缘￣滨浅湖带，内斜坡东部的扇三角洲平原侧缘￣扇三角洲前缘相带是有利储盖组合发育区，为涠三段有利勘探区带。

 Based on core, drilling, mud logging, well logging and analytical data, analyzing sedimentary facies such as petrologic characteristics, primary sedimentary structures, logging facies, seismic facies, it is concluded that the Member 3 of Weizhou Formation has two sedimentary systems, fan delta facies in northern slope, nearshore subaqueous fan and minor fan delta in southern fault. Eight types of subfacies were recognized, i.e. fan delta plain, fan delta front, and so on. Thirteen types of micro facies, braided distributary channel, sheet flood, subaqueous distributary channel, etc, are identified. Delta front-shore-shallow lacustrine facies belts in the western inner-slope and lateral margin of the fan delta-plainfan delta front facies belts in the eastern inner-slope are the favorable reservoir-seal assemblage development zones, which are the favorable exploration belts.

10.6056/dkyqt201602008