黄骅坳陷北大港油田古近系碎屑岩储层成岩作用及其对储层质量的影响

为了明确黄骅坳陷北大港油田古近系碎屑岩储层的成岩作用特征及其影响因素,在综合分析大量岩石薄片、扫描电镜、阴极发光、X衍射及物理性质等分析化验资料的基础上,对研究区古近系碎屑岩储层成岩作用类型及特征、成岩演化阶段及成岩作用影响因素进行了综合研究,并在此基础上划分了成岩相类型,探讨了成岩作用对储层质量的影响作用.结果表明,研究区东营组砂岩主要处于早成岩B期,部分达到中成岩A1期;沙河街组砂岩主要处于中成岩A期,部分达到中成岩B期.压实作用和胶结作用使储层原生孔隙迅速减少,渗透率降低,大大降低了砂岩的储集物性;后期的溶解作用促使砂岩次生孔隙发育,改善了砂岩的储集性能.研究区砂岩可划分为压实固结成岩相、碳酸盐胶结成岩相、弱胶结成岩相和不稳定组分溶蚀成岩相4种成岩相类型,其中不稳定组分溶蚀成岩相控制的储层物性最好,弱胶结成岩相控制的储层物性次之,碳酸盐胶结成岩相和压实固结成岩相控制的储层物性较差.明确研究区成岩作用特征及成岩相分布特点,对寻找该区有利储层具有重要指导意义.

Diagenesis of the Paleogene Clastic Reservoir and Their Relation with Reservoir Quality of Beidagang Oilfield in Huanghua Depression

This paper studies the diagenetic characteristics and the influencing factors related with the Paleogene clastic reservoir of Beidagang Oilfield in Huanghua Depression,based on a vast amount of data from rock thin section,scanning electron microscope,cathodoluminescence,X -ray diffraction and physical data,including the types and characteristics of diagenesis,diagenetic evolution stage,influencing factors of diagenesis,the classifications of diagenetic facies and the relation between diagenesis and reservoi...