CAJ | 학술논문

鄂尔多斯盆地合水地区长7段储层为典型的致密油储层，而致密油储层孔隙结构特征的表征及分类评价是储层研究的重点。运用铸体薄片、扫描电镜、高压压汞等方法，对其孔隙结构特征进行分析研究，并通过分析孔喉结构参数与宏观物性相关关系，提出以“分选排驱压力”作为孔隙结构分类标准，用数据构形理论确定其分类下限。结果表明：长7储层孔隙类型以长石溶孔为主，其次是残余粒间孔，喉道以窄片状和管束状为主，小孔—微喉和微细喉道，“高孔低渗”为其主要特征；以“分选排驱压力”为标准，将孔隙结构分为Ⅰ型、Ⅱ型和Ⅲ型三类，不同孔隙结构代表不同储层类型；三类储层类型对应三种储层物性，其中Ⅰ型储层物性最好，应作为开发的重点对象。
악이다사분지합수지구장7단저층위전형적치밀유저층，이치밀유저층공극결구특정적표정급분류평개시저층연구적중점。운용주체박편、소묘전경、고압압홍등방법，대기공극결구특정진행분석연구，병통과분석공후결구삼수여굉관물성상관관계，제출이“분선배구압력”작위공극결구분류표준，용수거구형이론학정기분류하한。결과표명：장7저층공극류형이장석용공위주，기차시잔여립간공，후도이착편상화관속상위주，소공—미후화미세후도，“고공저삼”위기주요특정；이“분선배구압력”위표준，장공극결구분위Ⅰ형、Ⅱ형화Ⅲ형삼류，불동공극결구대표불동저층류형；삼류저층류형대응삼충저층물성，기중Ⅰ형저층물성최호，응작위개발적중점대상。
Chang 7 member is a typical tight oil reservoir of Heshui area in Ordos Basin. Pore structure characteristics and classifi?cation evaluation is the key point of reservoir study. Using the methods of casting thin section, scanning electron microscope (SEM) and high pressure mercury injection, pore structure characteristics were analyzed. By analyzing correlation of pore throat structural parameters and macroscopic properties, sorting expulsion pressure was regarded as classification criteria of pore structure. The low?er limit classification of pore structure was determined based on data configuration theory. Results show that Chang 7 reservoir is mainly feldspar dissolved pore, followed by residual intergranular pore. Throat is mainly narrow flaky and control shape throat, fol?lowed by small pore-microthroat and high pore and low permeability. According to sorting displacement pressure, pore structure is divided into typeⅠ, typeⅡ and typeⅢ, and different pore structures represent different reservoir types. Three types of reservoir types correspond to three kinds of reservoir physical properties. Since typeⅠhas the best reservoir physical property, it should be the key development object.