张家垛油田阜三段湖相滩坝砂储层特征

doi:10.11743/ogg20150314

摘要/Abstract

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。

关键词: 滩坝砂, 储层, 成岩作用, 阜三段, 张家垛油田, 苏北盆地

Abstract: 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 3^rd Member 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.①Three 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.

Key words: beach bar sand, reservoir, diagenesis, 3^rd Member of the Funing Formation, Zhangjiaduo oilfield, northern Jiangsu Basin

中图分类号:

TE122.2

杨鹏,丁晓琪,张哨楠,等. 张家垛油田阜三段湖相滩坝砂储层特征[J]. 石油与天然气地质, 2015, 36(3): 456-462. doi: 10.11743/ogg20150314 Yang Peng,Ding Xiaoqi,Zhang Shaonan,et al. Characteristics of lacustrine beach-bar sandstone reservoirs in the 3^rd Member of the Funing Formation in Zhangjiaduo oilfield[J]. Oil & Gas Geology, 2015, 36(3): 456-462. doi: 10.11743/ogg20150314

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