珠江口盆地陆丰凹陷大中型油田地质特征及形成条件

发布时间：2018-04-15 05:18

本文选题：大中型油田 + 辫状河三角洲　；参考：《中南大学学报(自然科学版)》2017年11期

【摘要】：以珠江口盆地陆丰凹陷古近系文昌组A-1大中型油田为例,通过剖析其成藏要素和作用,探讨文昌组大中型油田的地质特征与形成条件。研究结果表明:文昌组油气主要分布在文昌组下段,为构造—地层型油气藏;储层主要为辫状河三角洲前缘水下分流河道砂岩,物性总体较差,为低孔低渗储层;原油为轻质油、油品好,成熟度Ro适中(Ro=0.73%);深层文昌组油水关系复杂,总体处于正常温压系统;断陷盆地斜坡区的构造背景控制了大面积储盖组合的形成,长期继承性的隆起是油气运移的优势指向区;良好的生烃条件与晚期强充注为大中型油田的形成提供了充足的油源;广泛分布的"甜点"优质储层与断裂结合形成大面积构造-地层圈闭,为油气聚集提供了场所;稳定的区域盖层保证油气在圈闭范围内大规模成藏,并在后期构造活动中不被破坏,有利于大面积原生轻质油藏保存。
[Abstract]:Taking the large and medium-sized oil fields of Wenchang formation of Paleogene in Lufeng depression of Zhujiang River mouth Basin as an example, the geological characteristics and forming conditions of large and medium-sized oil fields of Wenchang formation are discussed by analyzing their reservoir forming elements and functions.The results show that the oil and gas of Wenchang formation is mainly distributed in the lower part of Wenchang formation, which is a structure-stratigraphic reservoir, and the reservoir is mainly a braided river delta front underwater distributary channel sandstone with poor physical properties and low porosity and low permeability.Crude oil is light oil with good oil product, and its maturity is moderate, Ro is moderate and Roan is 0.730.The deep Wenchang formation has complex oil-water relations and is generally in a normal temperature and pressure system. The tectonic background in the slope area of the faulted basin controls the formation of a large area of reservoir and cap assemblage.The long-term inherited uplift is the dominant direction of oil and gas migration, and the good hydrocarbon generation conditions and late strong injection provide sufficient oil source for the formation of large and medium-sized oil fields.The widely distributed "desserts" high-quality reservoirs combined with faults form a large area of tectonic-stratigraphic traps, which provide a place for oil and gas accumulation, and stable regional caprocks ensure the large-scale accumulation of oil and gas within the traps,And it is not destroyed in the late tectonic activity, which is beneficial to the preservation of large area primary light reservoirs.
【作者单位】：中海石油(中国)有限公司深圳分公司;
【基金】：国家重大科技专项(2011ZX05023-001) 中国海洋石油总公司综合科研项目(YXKY-2015-SZ-02)~~
【分类号】：P618.13

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