CAJ | 학술논문

通过岩心观察、粒度分析、铸体薄片、扫描电镜、X—衍射、高压压汞等实验方法对鄂尔多斯盆地西缘姬塬地区与盆地东缘安塞地区延长组长6储层成岩作用进行研究对比。研究表明盆地东西缘长6储层来自于不同的物源区，主要发育了机械压实作用、溶蚀作用、胶结作用。其中压实作用是造成延长组长6储层砂岩孔隙度丧失的主要原因。胶结作用同样降低了储层物性，其中碳酸岩胶结物是研究区胶结作用中的主要胶结物。姬塬研究区以方解石为主，其次为硅质胶结；安塞研究区早期胶结的方解石大部分被溶蚀，含量不多，以晚期胶结未被大量溶蚀的铁方解石为主，硅质胶结物含量较少。
통과암심관찰、립도분석、주체박편、소묘전경、X—연사、고압압홍등실험방법대악이다사분지서연희원지구여분지동연안새지구연장조장6저층성암작용진행연구대비。연구표명분지동서연장6저층래자우불동적물원구，주요발육료궤계압실작용、용식작용、효결작용。기중압실작용시조성연장조장6저층사암공극도상실적주요원인。효결작용동양강저료저층물성，기중탄산암효결물시연구구효결작용중적주요효결물。희원연구구이방해석위주，기차위규질효결；안새연구구조기효결적방해석대부분피용식，함량불다，이만기효결미피대량용식적철방해석위주，규질효결물함량교소。
Basing on the analysis of core and cutting observation,particle size analysis,casting lamella,scanning electron microscope,X-diffraction analysis etc,the paper compares the characteristics of diagenesis in the Chang 6 sandstone reser-voirs of Triassic Yanchang Formation at Jiyuan area in the western part and Ansai area in the eastern part of the Ordos Basin. It is shown that the mainly four diagenetic factors of Chang 6 were compaction,cementation and dissolution this area. The compaction is the main factor causing the loss of porosity for the sandstone. Cementation also caused the low porosity,and car-bonate is the main cements in the cementation. The main cement is calcite in Jiyuan area,followed by siliceous cementation. The content of siliceous cement and calcite which most of calcite were dissoluted is not more in Ansai area. The main cement in Ansai is ferrocalcite which is most of ferrocalcite were not dissolved.