玛南地区乌尔禾组成岩作用对储层物性的影响

利用岩芯观察、铸体薄片鉴定、扫描电镜、X 衍射分析方法并结合测录井等资料，对准噶尔盆地玛南地区二 叠系乌尔禾组储层的岩石学特征、成岩作用及其对储层物性的影响作用进行了研究。结果表明：研究区储集岩以砾岩 为主，发育少量砂岩，成分成熟度和结构成熟度均较低。目前研究区储层成已处于中成岩阶段B 期，成岩作用复杂， 对储层物性影响较大的成岩作用主要有压实作用、胶结作用和溶蚀作用，其中压实作用对研究区储层的孔隙破坏性最 大，是导致储层低孔低渗的根本原因；胶结作用对储层物性影响具有双面性，胶结物的发育一方面减少了储层孔隙度， 但亦在一定程度上抵御了压实应力，并为后期溶蚀作用的发生提供了物质基础；研究区储层埋藏较深，经历了较强的 压实和胶结作用，储层物性差，而溶蚀作用形成的次生孔隙有效地改善了储层物性，是研究区在低孔低渗背景下形成 局部相对优质储层的重要途径。

Effects of Diagenesis and Reservoir of the Urho Formation in#br# Manan Region

Using core observation，casting thin sections identification，scanning electron microscopy（SEM），X-ray diffraction analysis method with logging and mud logging data，the characteristics of reservoir sandstone，diagenesis and its influence on reservoir physical property of the Permian Urho Formation in Manan region，Junggar Basin were studied. The results show that the reservoir rock types in the study area are mainly conglomerate，and a small amount of sandstone；reservoir compositional maturity and textural maturity are low. At present，the reservoir in the study area is mainly at the middle diagenetic stage B period，and reservoir experienced complicated diagenesis；the main diagenesis that has a greater influence on the reservoir property includes compaction，cementation and dissolution；the compaction effect of the reservoirs in the study area is the most devastating，being root of low porosity and low permeability reservoirs；cementation has two-sided influence on reservoir on the one hand. On the other hand，cement reduces the reservoir porosity，but also resists the compaction stress to a certain extent，and provides the material foundation for the later dissolution. The reservoir in the study area is deeply buried，and has experienced strong compaction and cementation. Therefore，reservoir property is poor，but is improved by the dissolution of secondary pore，which is an important approach to relatively high quality reservoirs in the study area under the background of low porosity and low permeability.