靖边气田南部Mu1-4储层控制因素研究

CONTROL FACTORS OF MU_(1-4) RESERVOIR IN THE SOUTH OF JINGBIAN GAS FIELD

通过对靖边气田南部MU1-4储层的沉积微相、成岩作用、构造特征及古地貌单元特征进行分析,认为潮上带的(含)膏模膏核泥-细粉晶白云岩和潮间带上部的膏模泥-细粉晶云岩为最有利微相.对孔隙起建设性成岩作用主要是准同生白云石化作用、表生岩溶作用和埋藏溶解作用,构造高部位的储渗能力较强,岩溶斜坡及台丘,尤其古沟槽附近,是岩溶储层发育的有利区域.要准确把握本区碳酸盐岩储集层的分布规律,需以沉积微相、成岩作用为基础,结合现今构造特征和岩溶古地貌,展开多因素组合分析.

Carbonate rock is the main reservoir of Jingbian gas field,which belongs to the type of low porosity,low permeability,low abundance,furthermore higher heterogeneity and more difficulty of exploitation.The study area is in the south of Jingbian gas field,Based on the research of micro sedimentation,diagenesis,tectonic and paleogeomorphy.which is the key control factors of principal producing formation Mu1-4 in the Sourth Of Ordos basin Jingbian gas field.The research shows that gypsum mode and gypsum concretion on the superatidal zone is The best micro sediment facies;The construal diagenesis is the dolomitization,supergene karst and buried karst action;Porosity and Permeability is better in the high position of tectonic;The physical property of contain rock in The clinoform,tableland and around the ravine should be the favorable areas of karst reservoir development.Based on the integrated analyzed four controlled factors,The advantage areas be assessed and classified.