巴喀地区八道湾组致密砂岩储集层非均质特征及影响因素

Heterogeneity and Its Impact Factors of Tight Sandstone Reservoirs in the Badaowan Formation in Baka Area

利用钻井岩心、测井、矿物成份及综合测试等资料,结合物性、地震数据,对巴喀地区八道湾组致密砂岩储集层的物源及非均质性特征进行分析研究。结果表明:巴喀地区八道湾组沉积时期物源来自北部的博格达山;区内储集层的层内、层间及平面非均质性均很强,其非均质性受沉积相与沉积环境、成岩作用共同的影响。层内非均质性上八二段的非均质程度强于八一段;层间非均质性表现为随埋藏深度增加,孔隙度和渗透率呈现先增大后减小的变化;平面非均质性上储集层孔隙度存在两个高值区,向四周孔隙度数值逐渐降低;渗透率存在一个高值区,向四周数值也逐渐降低。

On the basis of core,logging data,mineral compositions and comprehensive test data,combined with reservoir physical data and seismic data,the formation provenance and heterogeneity characteristics of tight sandstone gas reservior of the Badaowan Formation in Baka area were studied systematically.The results show that the provenance of Badaowan Formation is from Bogda Mountain in the north,the inner layer,interlayer and plane heterogeneity of reservoirs that are influenced by sedimentary facies,sedimentary environment and diagenesis are very strong in the study area.From the inner layer heterogeneity of reservoir,Ba2 segment is stronger than that of Ba1 segment.The interlayer heterogeneity of reservoir show that the porosity and permeability increase firstly and then decrease with the increase of burial depth.On the plane heterogeneity,there are two high-value zones in the porosity of the reservoir,which decrease gradually to the surrounding porosity value,there is a high value area of the permeability,which decrease gradually to the surrounding permeability value.