伊拉克东南部塞诺曼阶—早土伦阶储层类型、特征及主控因素  

Reservoirs types,characteristics and main controlling factors of Cenomanian-Early Turonian in the Southeastern Iraq

作　　者：李峰峰 李蕾 陈昊卫 万洋 王文钰 LI Fengfeng;LI Lei;CHEN Haowei;WAN Yang;WANG Wenyu(Research Institute of Petroleum Exploration and Development,Beijing 100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《东北石油大学学报》2024年第4期16-28,I0002,共14页Journal of Northeast Petroleum University

基　　金：中国石油科技重大专项(2023ZZ19-01);中国石油科技重大专项(2023ZZ19-07)。

摘　　要：基于钻井取心、铸体薄片、压汞实验、物性分析、扫描电镜及测井曲线等资料,根据地质成因和岩石物理特征划分伊拉克东南部塞诺曼阶—早土伦阶储层类型,分析储层特征及主控因素。结果表明:塞诺曼阶—早土伦阶储层划分为沉积型、成岩型、沉积—成岩型和复合型,沉积型发育于高能环境,原生粒间孔发育程度高,物性为高孔高渗,是油藏开发的首选目标;成岩型沉积于低能环境,准同生溶蚀形成大量次生孔隙,物性为中高孔中低渗,是油藏长期稳产的重要接替资源;沉积—成岩型沉积水体能量中等,发育少量原生粒间孔,准同生溶蚀形成次生孔隙,物性为中高孔中渗,是油藏开发上产的重要支撑资源;复合型储层孔隙受构造作用、沉积作用和成岩作用综合控制,物性通常为中高孔中高渗,是油藏开发早期重要的目标产层。塞诺曼阶—早土伦阶沉积期,伊拉克东南部为宽缓的浅水碳酸盐岩缓坡,沉积相显著分异,准同生成岩作用充分;层序旋回过程中,沉积相快速演化,气候条件和暴露时间控制成岩作用类型和强度;构造作用在局部形成断层,促进埋藏溶蚀作用。该结果为巨厚生物碎屑灰岩储层评价和滚动开发部署提供地质依据。Based on the data of drilling core,casting thin sections,mercury injection capillary pressure,physical property,scanning electron microscope and wireline loggings,the reservoir types of Cenomanian-Early Turonian in Southeastern Iraq were classified based on geological origin and petrophysical characteristics,and reservoirs characteristics and the main controlling factors were clarified.The results show that the reservoirs in Cenomanian-Early Turonian are divided into sedimentary type,diagenetic,sedimentary-diagenetic and composite types.Sedimentary type is developed in high-energy environments,with abundant primary interparticle pores,and its physical properties are high-porosity and high-permeability,which is the first choice of the target for the development.Diagenetic type is deposited in a low-energy environment,with a large number of secondary pores formed by penecontemporaneous dissolution and physical properties are medium-high porosity and medium-low permeability.It is an important replacement resource for long-term stable production.The depositional energy of sedimentary-diagenetic type is moderate,developing a small amount of primary intergranular pores,and penecontemporaneous dissolution forms secondary pores,with medium-high porosity and medium-permeability,and which is an important support resource to increase the production.The pores of composite types are under the comprehensive control of tectonics,sedimentation and diagenesis,and the physical properties are medium-high porosity and medium-permeability,which is an important perforation target in the early stage of development.During Cenomanian-Early Turonian,Southeastern Iraq is a wide and shallow carbonate ramp,the sedimentary facies is significantly differentiated,and the penecontemporaneous diagenesis is sufficient;during the sequence cycle,the sedimentary facies evolves rapidly,and the climate and exposure span control the type and intensity of diagenesis.Tectonism forms faults locally,and promotes burial dissolution.The results provide a geol

关 键 词：伊拉克东南部 塞诺曼阶—早土伦阶 储层 生物碎屑灰岩 沉积作用 成岩作用 碳酸盐岩缓坡 

分 类 号：TE122[石油与天然气工程—油气勘探]