张家垛油田阜三段湖相滩坝砂储层特征  

Characteristics of lacustrine beach-bar sandstone reservoirs in the 3^(rd) Member of the Funing Formation in Zhangjiaduo oilfield

作　　者：杨鹏[1,2] 丁晓琪[1,3] 张哨楠[1,2] 韩玫梅[1,2] 刘曦翔 湛小红[1] 张咏梅 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]西南石油大学地球科学与技术学院,四川成都610500 [3]成都理工大学能源学院,四川成都610059

出　　处：《石油与天然气地质》2015年第3期456-462,共7页Oil & Gas Geology

基　　金：国家自然科学基金项目(41302115);博士后科学基金项目(2012M511941);国家自然科学青年基金项目(41302115)

摘　　要：湖相滩坝砂往往毗邻烃源岩,在高源-储压差条件下易聚集成藏。近年来在我国东部新生代地层中发现了大量的此类油气藏,成为勘探的热点。以张家垛油田阜三段为例,通过岩心观察、研究滩坝砂的分布规律;利用压汞资料、铸体薄片及扫描电镜,分析不同成因储层的孔喉分布和孔隙类型组合。研究结果表明:1滩坝砂中发育3种岩相,4种岩相组合类型,对应于4种测井相;2滩坝砂具有粒度细、单层厚度小、滩坝间互、叠合连片的特征,坝砂呈土豆状平行于湖岸线展布;3坝砂以细砂岩为主,杂基含量低;原生孔隙和次生孔隙发育,粘土中富高岭石而贫绿泥石和混层粘土;滩砂以粉砂-极细砂为主,杂基含量高,孔隙结构差,次生孔隙欠发育,粘土中富混层粘土而贫高岭石和绿泥石。Lacustrine beach-bar sandstone is generally adjacent to source rocks,and it is favorable for hydrocarbon accumulation under high differential pressure between the source rock and reservoir. In recent years,a large number of oil and gas reservoirs have been discovered in the Cenozoic lacustrine beach bar sandstones in eastern China. Distribution of beach-bar sands in the 3rdMember of the Funing Formation was studied on the basis of the core observation. Mercury data,cast thin sections and scanning electron microscope were integrated to analyze the distribution of pore throat and the combinations of porosity types in reservoirs of different genetic types. The following results were obtained. 1 Three kinds of lithofacies were recognized in beach-bar sand and they can be organized into four kinds of lithofacies associations,which correspond to four kinds of logging facies; 2The beach-bar sand has the characteristics of fine grain size,thin single layer,as well as interbedding,overlapping and lateral connection of the beach and barsands,and the potato-shaped bar sands are distributed in parallel with the lake shoreline; 3The bar sands are dominated by fine sandstone with low matrix content;Primary pore and secondary pore are well developed,and clay minerals are rich in kaolinite and poor in chlorite and mixed layer; the beach sands are generally dominated by siltstone and very fine sandstone with high matrix content; Their pore structures are poor and secondary pores are underdeveloped,and the clay minerals are rich in mixed layer and poor in kaolinite and chlorite.

关 键 词：滩坝砂 储层 成岩作用 阜三段 张家垛油田 苏北盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]