冀中坳陷霸县凹陷文安斜坡沙三段储层特征及有效储层控制因素  

Characteristics and Controlling Factors of Effective Reservoirs in Es_3 Formation of Wen'an Slope,Baxian Sag,Jizhong Depression

作　　者：李宇志[1] 金杰华 操应长[2] 葸克来[2] 周磊[2] 崔周旗 何斌 董雄英 

机构地区：[1]中国石化胜利油田分公司东辛采油厂,山东东营257094 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]中国石油华北油田分公司,河北任丘062552

出　　处：《现代地质》2014年第3期617-625,共9页Geoscience

基　　金：国家自然科学基金重点项目(U1262203);国家科技重大专项项目(2011ZX05009-003);中央高校基本科研业务费专项资金项目(14CX06013A)

摘　　要：综合运用岩心观察、薄片鉴定、物性分析等技术方法,系统分析了文安斜坡沙三段储层岩石学特征、成岩作用特征及储集特征。研究表明,文安斜坡沙三段储层岩石类型以岩屑长石砂岩为主,杂基含量低,成分成熟度和结构成熟度中等;储集空间以原生孔隙为主,占总孔隙的72.81%,储集物性较差,属中低孔-低渗特低渗储层;储层主要经历了压实作用/早期碳酸盐胶结→长石、岩屑溶解/石英次生加大/高岭石充填→石英溶解/碳酸盐胶结→黄铁矿胶结。在有效储层物性下限计算的基础上,选取孔隙度差值作为参数,系统分析了有效储层控制因素。有效储层的形成主要受沉积微相、粒度、分选、成岩作用以及地层压力控制。水下分流河道和河口坝微相中碎屑颗粒越粗,分选越好,杂基含量越少,有效储层越发育;胶结作用对储层物性的控制较明显,是影响中深层储层物性的主要因素;溶蚀作用主要表现为长石等硅酸盐矿物的溶蚀,平均增孔量3.42%;早期地层超压抑制压实作用,保护孔隙,是有效储层发育的有利因素。The petrologic features, diagenesis characteristics and reservoir characteristics of the Esz reservoirs in Wen＇an slope were systematically studied by core observation, thin section observation and physical property analysis. It can be seen that the study area mainly developed lithic arkose, which contains a few matrixes and its component maturity and structure maturity are in the middle. The reservoir spaces of the lithic arkose are primary pores, which occupy 72. 81% of the total pores. The reservoirs possess comparatively bad reservoir char- acteristics, and belong to middle-low porosity, low to ultra-low permeability reservoirs. The reservoirs sequently underwent a series of diagenetic stages as follows ： consolidation and early carbonate cementation-ffeldspars and rock debris dissolution, quartz enlargement, kaolinite fillings →quartz dissolution and carbonate cementation→pyrite cementation. On basis of analyzing the lower limits of effective reservoir properties, this study systemically analyzed the controlling factors of effective reservoirs, which include sedimentary microfacies, particle size, sorting, diagenesis and formation pressure. Better reservoirs developed in coarser grains in underwater distributary channels and estuary dams, which have better sorting and fewer matrixes. Cementation has distinct control effect on reservoir characteristics, and is the major controlling factor of characteristics of mid-deep reservoirs. Dissolution is mainly shown as the corrosion of silicate minerals such as feldspars, in which the average increasing of pore volume is 3.42%. The overpressure of early phase restrained compaction, protecting the pores, and became the favorable factor of the development of effective reservoirs.

关 键 词：储层特征 有效储层 控制因素 沙三段 文安斜坡 霸县凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]