金庄地区长6成岩作用及孔隙结构特征

Diagenesis and pore structure characteristics of the Chang 6 of Jinzhuang area

利用岩石学、地层学、沉积学、储层地质学等理论和方法,通过显微镜薄片观察、扫描电镜和X衍射等资料的统计分析,对鄂尔多斯盆地南泥湾油田金庄地区上三叠统延长组长6油层组的岩石学特征、成岩作用、孔隙、喉道类型、孔喉结构特征以及成岩作用对储层物性的影响进行深入研究,分析该地区主要成岩作用及孔隙结构特征.研究结果表明,金庄地区长6油层组碎屑岩主要为灰色、浅灰色、灰绿色、灰褐色细砂岩和中-细砂岩,碎屑成分主要为石英、长石、岩屑和云母,杂基与胶结物的含量变化大,为1％ ～33％,主要集中在4％ ～ 22％,平均为约9％.砂岩以原生粒间孔和长石溶孔为主,孔隙类型为溶孔-粒间孔和粒间孔-溶孔;孔喉结构主要为大孔-细喉型和中孔-微细喉型,是研究区主要储集空间类型,总体上为低孔、低渗储层;成岩作用主要有压实、压溶、胶结和溶解作用.

Based on petrology, stratigraphy, sedimentology, reservoir geology theories and methods, statistical analysis of microscope thin sections, scanning electron microscopy and X-ray diffraction and other information,Nanniwan Ordos Basin Oilfield Jinzhuang Upper Triassic Chang 6 oil group petrological characteristics ,the diagenesis, pore, throat type, pore structure and diagenesis on reservoir properties were studied. Clastic rocks of Jinzhuang area chang 6 are mainly gray,light gray, gray-green, gray-brown fine-grained sandstone and medium-fine sandstone, debris mainly composed of quartz, feldspar, rock cuttings and mica,heteroaryl group and cement content changes from 1% to 33% , mainly in 4% to 22% , with an average of about 9%. Diagenesis are compaction ,cementation and dissolution. Sandstone is primary intergranular pore and feldspar dissolved pore, pore type is dissolved pore-intergranular pore and intergranular hole-dissolved pore;pore throat structure is mainly the big hole-thin throat and the holefine throat, the study area is the main reservoir space types with generally low porosity and low permeability reservoir.