大牛地气田太2气藏细分开发单元及调整对策——以A井区为例

Subdivision development units and adjustment countermeasures of Tai 2 gas reservoir in Daniudi gas field--by taking well block A as an example

大牛地气田太原组太2段属于典型的低孔、特低渗致密砂岩气藏,储层物性差,非均质性强,目前处于低压低产阶段,存在采出程度低、液气比高、关停井增多等问题。本文以大8–大10井区为例,利用静态地质资料及动态生产数据,首次开展了致密气藏细分开发单元研究,将研究区细分为4类开发单元,并对不同开发单元提出了具体调整对策,针对开发单元②提出了井网加密、关停井治理措施,针对开发单元④提出了水平井侧钻等措施。研究成果对于研究区后期开发调整及储量有效动用,具有重要指导意义。

Tai 2 member of Taiyuan formation in Daniudi gas field is a typical tight sandstone gas reservoir with low porosity and ultra-low permeability.The reservoir has poor physical properties and strong heterogeneity.At present,it is in the stage of low pressure and low production.There are some problems such as low recovery,high liquid gas ratio and more shut-in wells.Taking well block Da 8-Da 10 as an example,based on the static geological data and dynamic production data,the subdivision development unit of tight gas reservoir is studied for the first time.The study area is subdivided into four types of development units,and the specific adjustment countermeasures for different development units are put forward.For the development unit②type,the measures of well pattern densification and well shut-down are put forward,and as for the development unit④type,the measures of horizontal well sidetracking are put forward.The research results provide important guidance for the later development adjustment and effective production of reserves in the study area.