滨南油田毕家断块扇三角洲储层沉积学特征

SEDIMENTOLOGY OF FAN DELTAIC RESERVOIRS IN BIJIA FAULT BLOCK,BINNAN OILFIELD

伍涛 武法东 陈建渝 毕义泉

Wu Tao Wu Fadong Chen Jianyu Bi Yiquan

滨南油田毕家断块扇三角洲分为粗粒突变型(近源型)和细粒渐变型(远源型)两种层序。由第四砂层组到第一砂层组,表现为由浅水到半深水的逐渐演化过程。北部边缘同生断层对第一、二、三砂层组碎屑物质供给起控制作用,第四砂层组则具有多物源供给趋势。储层主要是扇三角洲前缘的各种砂体,其中以河口坝、分支河道最为有利。储层垂向非均质性与沉积演化密切相关,构造活动和湖盆扩展的最弱层段非均质性最强(第四砂层组变异系数2.02),构造活动和湖盆扩展最强的层段最弱。

Two types of fan deltaic sequences have been identified in Bijia fault block,Binnan Oilfield,i e.near source sequence and far source sequenec.The sequences from the fourth to the first sand beds suggest the evolution process of shallow →bathyal water evironment.The north marginal contemporaneous fault controlled the debris supply of 1st～3rd sand beds,and the forth sand bed seemed to have multi source supplies.Reservoirs in this area are mainly various sand bodies in fan deltaic front,among which river mouth bars and distributary channels are more favourable.The vertical heterogeneity of the reservoirs are closely related to depositional evolution.

10.11743/ogg19970211