东营凹陷古近系-新近系流体-岩石相互作用分带特征  

Fluid-rock Interaction Zones and Their Characteristics of Palaeogene and Neogene Systems in Dongying Depression

作　　者：刘华[1] 

机构地区：[1]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《山东科技大学学报（自然科学版）》2015年第2期41-50,共10页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家油气重大专项项目(2011ZX05006-001)

摘　　要：东营凹陷古近系-新近系地层流体-岩石相互作用及衍生出的多类次生矿物是自上而下储层物性发育条件的主控因素。浅、中、深以及超深层具有不同的流体-岩石作用方式,对储层物性的影响程度亦不同。为优化储层分类,运用ICP发射光谱、扫描电子显微镜和自主性室内流动模拟试验等方法,对不同深度地层水化学特征和岩石样品中的次生矿物(流体-岩石作用的结果)、形成的先后顺序及化学组成等要素进行分析,发现地层流体-岩石相互作用的分带性及其作用特征:浅部和中部流体-岩石相互作用带的流体-岩石相互作用较弱,主要为有机质和细菌参与下的生物化学作用、微弱的生烃作用和有机酸的生成作用、部分长石溶蚀作用和碳酸盐溶解作用以及石英和粘土矿物(伊蒙混层和高岭石等)的形成作用、碳酸盐的沉淀作用,流体-岩石相互作用对储层物性的影响较小;深部和超深部流体-岩石相互作用带流体-岩石相互作用较强,有机酸的生成或脱羧作用比较强,铝硅酸盐的溶蚀作用、碳酸盐的溶解和沉淀作用以及粘土矿物的形成作用都很强,对储层物性具有重要影响。Fluid-rock interaction and its derivate secondary minerals are key factors controlling the development of reservoir properties in Palaeogene and Neogene systems in Dongying depression. Different fluid-rock interaction palterns occurred at different depth levels （shallow, middle,deep, ultra deep）,and exerted different influences on reservoir properties. To optimize reservoir bed classification, advanced instruments such as ICP emission spectrum and scanning electron microscope were applied,and self-automatic indoor flow simulation was carried out. Chemical pro-perties of formation water in different depths and secondary minerals （results of fluid-rock interaction） in rock sampies were analyzed. Through these analyses, occurrence sequence of the secondary minerals and their chemical com position were determined,and zonal distribution of fluid-rock interaction and their characteristics were summarized. Fluid rock interactions in the shallow and middle zones are relatively weak, including biochemical reaction with the participation of organic matter and bacteria,weak hydrocarbon and organic acid generation, partial feldspar and carbonate dissolution,quartz and clay minerals （andreattite and kaolinite） formation, and carbonate precipitation. The fluid-rock interaction in these two depths has little effects on reservoir porosity and permeability. Fluid-rock interac tions in the deep and ultra deep zones are relatively strong. With intensive organic acid generation and decarboxyla tion, aluminosilicate dissolution, carbonate dissolution and precipitation and clay mineral formation, fluid rock interaction has a strong impact on reservoir porosity and permeability.

关 键 词：流体-岩石相互作用类型 流体-岩石相互作用带 古近系 新近系 东营凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]