CAJ | 학술논문

渤海湾盆地东营凹陷砂岩储层中长石含量丰富，而且长石溶蚀现象普遍，对储层物性具有重要影响。运用偏光显微镜、扫描电镜以及X-射线粉晶衍射等分析技术，对东营凹陷砂岩储层中长石及其溶蚀产物的分布特征进行了研究。结果表明：在不同地区长石含量存在差异，凹陷北部长石含量最高，其次是南部，最低的是中部地区；在层位上，沙河街组一段长石含量最高，其次为沙河街组二段和沙河街组四段，含量最低的是沙河街组三段；在东营凹陷砂岩储层中，长石主要的溶蚀产物为高岭石、伊利石和绿泥石。由于高岭石向伊利石和绿泥石转化，导致高岭石含量逐渐降低，浅部的伊利石和绿泥石主要由伊/蒙混层转化而来，而深部的伊利石和绿泥石主要由高岭石蚀变形成。砂岩储层中的伊/蒙混层矿物在浅层含量高，随着埋藏深度增加，含量逐渐降低。
발해만분지동영요함사암저층중장석함량봉부，이차장석용식현상보편，대저층물성구유중요영향。운용편광현미경、소묘전경이급X-사선분정연사등분석기술，대동영요함사암저층중장석급기용식산물적분포특정진행료연구。결과표명：재불동지구장석함량존재차이，요함북부장석함량최고，기차시남부，최저적시중부지구；재층위상，사하가조일단장석함량최고，기차위사하가조이단화사하가조사단，함량최저적시사하가조삼단；재동영요함사암저층중，장석주요적용식산물위고령석、이리석화록니석。유우고령석향이리석화록니석전화，도치고령석함량축점강저，천부적이리석화록니석주요유이/몽혼층전화이래，이심부적이리석화록니석주요유고령석식변형성。사암저층중적이/몽혼층광물재천층함량고，수착매장심도증가，함량축점강저。
Sandstone reservoirs in Dongying Sag ,the Bohai Bay Basin are rich in feldspar ,dissolution of which is very com-mon and has an important influence on reservoir physical properties .Polarizing microscope ,SEM and X-ray powder diffrac-tion technologies were used to study the distribution characteristics of feldspar and its dissolution products in the sandstone reservoirs in Dongying sag .The content of feldspar varies in different areas .The highest content of feldspar occurs in the north,followed by the south ,and the lowest is in the central area .Vertically,Es1 is the richest in content of feldspar ,fol-lowed by Es2 and Es4 f,and Es3 is lowest.The main dissolution products of feldspar in the sandstone reservoirs in Dongying sag include kaolinite ,illite and chlorite .The transformation kaolinite to illite and chlorite causes the decrease of content of kaolinite .The illite and chlorite in the shallow layer are mainly transformed from I /S,while they come from kaolinitic alter-ation in the deep layer .The content of I/S is high in shallow layer ,and reduces with the increasing depth .