摘要
Elang组是Bonaparte盆地Sahul区块的主要含油气层,属于浅海相三角洲前缘沉积,钻探结果表明研究区该套储层的物性呈现出"南好北差"的特点。利用铸体薄片、扫描电镜和X光衍射等多种方法和手段重点研究了Elang组砂岩的成岩作用特征。研究表明该套砂岩在区块南北的物理和化学成岩作用均不同,北部地区处于中成岩阶段的A1期,主要发育胶结、溶蚀等成岩作用;南部储层处于中成岩阶段的A2期和B期,主要发育机械压实和胶结、交代等成岩作用。这种差异成岩作用是影响储层孔隙发育的主控因素之一,也是导致储层物性北好南差的主要原因。研究这种差异性对于寻找有利储层发育区具有重要的理论价值和实际意义。
Elang sandstone formation（deltaic to shallow marine） is the significant reservoir in the Sahul block of Bonaparte Basin.The drilling data results indicate that the reservoir property has high quality in the north and poor one in the south.This thesis studies the diagenesis of Elang sandstone by impregnated thin-section,scanning electron microscopy,X-ray diffraction and so on,and points out that the diagenesis between the north and the south in the Sahul block is quite different.The diagenesis in the north is in the middle stage of A1 and includes cementation and dissolution,whereas in the south it is from the middle stage of A2 to the middle stage of B and consists of mechanic compaction,cementation and metasomatism.The difference of diagenesis is the key factor affecting the porosity of Elang sandstone reservoir as well as resulting in the difference of reservoir quality between the north and the south.Therefore,it is highly practical and important for reservoir appraisal in studying such differences among various areas and predicting favorable reservoir.
出处
《现代地质》
CAS
CSCD
北大核心
2011年第1期78-84,共7页
Geoscience
