柳杨堡气田太2气藏单砂体识别及水平井动用对策

The single sand body identification and horizontal well development countermeasures of T2 gas reservoir in Liuyangbao gas field

柳杨堡气田目前处于水平井开发的初期阶段,在致密低渗气田水平井规模化开发的情况下,研究单砂体展布与水平井优化部署对该气田水平井规模化开发具有重要的指导意义。以柳杨堡气田太2气藏为研究对象,开展高分辨率层序地层学研究,将太2层段划分为三个层序旋回,确定了煤岩、灰岩和泥质隔夹层这三个太2气藏单砂体识别标志、纵横向展布特征和平面展布特征,在主要标志层的约束下,识别出太2沉积期的两套储集砂体,总结出了孤立式、叠加式和多层式单砂体的三种叠置模式,并建立了三种单砂体叠置模式对应的的水平井设计原则。

Liuyangbao gas field is currently in the early stage of development.Under the condition of dense low permeability gas field developed by horizontal well,It has an important guiding significance in identifying the single sand body and studying its distribution for the optimization of horizontal well deployment.This article take Liuyangbao gas field T2gas reservoir as the research object,carrying out the high resolution sequence stratigraphy research,and based on this,T2 gas reservoir is divided into three short term cycles,and then,we clear about the single sand body identification such as the coal seam,limestone and mudstone interlayer.After that,the study identified the horizontal distribution characteristics and plane distribution characteristics of these recognition marks.Under the constraint of these marked beds,this paper identified two sets of reservoir sand body which formed from different depositional period,summarized three superimposed models of single sand body:superimposed models,isolated type,superimposed type.At last,we set up different horizontal well design principles corresponding to the three kinds of single sand body superimposed pattern.