川东北七里北石炭系储层特征

Reservior characters of Carbonic in northern Qili of northeast sichuan basin

七里北构造石炭系勘探程度较低,是川东北地区几个尚未取得突破的石炭系构造之一.为了弄清七里北构造石炭系储层特征及其控制因素,通过对已有的岩心孔隙资料和测井资料对储层进行的定量解释.结果表明:储集岩包括细粉晶云岩、残余生屑灰质云岩等;储集空间主要为孔隙,包括次生和原生孔隙,其次为裂缝;七里北石炭系储层储集物性较差,非均质性较强,其储层类型为裂缝-孔隙型;储层控制因素主要为成岩作用和沉积相;综合储层各类参数,认为七里北南段储层发育优于北段.

Northern QiLi,which is one of the carboniferous structures without gas in northeast of Sichuan basin,is low explored.To make clear the characteristic of carboniferous reservoir and its controlling factors in northern Qili,this thesis makes the integrated study of the drilling data from the construction of northern QiLi and the quantitative interpretation results of the existing core pore material and the logging data.It shows that the reservoir rocks include crystalline powder dolomite and arene dolomite.While poles,including secongdary and original pores,are the main types of reservoir space,supplemented by fracture.The reservoir is a fractured-porous type with low porosity and high heterogeneity.Meanwhile the diagenesis and sedimentary facies are the main control factors for the reservoir.By integrating several reservoir parameters,it is obviously that south regional of northern Qili is the better reservoir.