摘要
Z地区马五_(1-2)亚段靠近古风化壳是马家沟组主力储集层段之一,具有重要的研究意义。本文基于岩心观察、薄片鉴定、压汞分析等结果,对Z地区马五_(1-2)亚段碳酸盐岩储层的岩石学特征、储集空间类型、物性特征以及储集空间组合及孔隙结构等储层特征进行了分析,并结合沉积微相及岩溶古地貌分析了储层的主控因素。结果表明,Z地区马五_(1-2)亚段储层岩石类型分别以泥质、硬石膏、灰质含量较高的含泥云岩和泥质云岩,含膏云岩以及含灰云岩和灰质云岩为主。储集空间类型以微孔、微缝等发育的基质内储集空间系统和溶孔、裂缝发育的宏观缝洞储集空间系统为主。储层孔隙发育且连通性较好,部分储层样品裂缝及微裂缝发育;裂缝—溶孔型、孔隙型及微孔型是Z地区马五_(1-2)亚段三种主要的储集空间组合类型,且对应的孔隙结构依次变差;储层主控因素包括沉积微相及岩溶古地貌,其中沉积微相的分布决定了储层形成的物质基础,前石炭纪岩溶古地貌决定了储层储集空间的发育程度及主力储集层段的位置。
Ma 51-2 submebers of Z area is one of main reservoirs of Majiagou formation and has important research significance because of its location near the paleo-weathering crust.The petrologic characteristics,reservoir space type,physical properties and pore structure of the carbonate reservoir of the M51 to M52 submebers in Z area were analyzed based on the results of core observation,thin section identification and mercury intrusion,and the main controlling factors of reservoir was analyzed from the aspects of sedimentology and diagenetics.The result shows that the main rock types of the Ma 51-2 sub-members in the Z area are argillaceous dolomite,gypsum dolomite and calcareous dolomite with relative high content of clay minerals,anhydrite,calcite.The types of reservoir space are mainly the reservoir space system of the matrix developed by micropores and microslits,and the macroscopic fracture-cavity reservoir system developed by pores and fractures.The pores of the reservoir are well developed with good connectivity,the fractures and microfractures develop in part of the reservoir samples;The type of the main reservoir space combinations of Ma 51-2 in Z area,and the corresponding pore structure are deteriorating in turn.The main controlling factors of reservoir include sedimentary microfacies and karst paleogeomorphology,in which the distribution of sedimentary microfacies determines the material basis for reservoir formation,and the former Carboniferous karst paleogeomorphology determines the development degree of the storage space of reservoir as well as the location of the main reservoir.
作者
张丽娟
张席琴
ZHANG Li-juan;ZHANG Xi-qin(Research Institute of Exploration and Development, Zhidan Oil Production Plant, Yanchang Oilfield Company, Shaanxi Yan'an 717500,China)
出处
《辽宁化工》
CAS
2018年第4期324-326,329,共4页
Liaoning Chemical Industry
关键词
马五1-2亚段
储层特征
主控因素
古地貌
沉积微相
Ma51-2 sub-members
reservoir characteristics
main controlling factor
palaeogeomorphology
sedimentary microfacies