断陷湖盆滩坝储集体沉积特征及沉积模式
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摘要
通过综合分析大量的地质、测井、地震及室内分析资料，研究了陆相断陷湖盆中砂质滩坝和生物粒屑滩坝储集体的沉积特征，根据滩坝的沉积特征及其分布位置，确定出湖岸线拐弯处滩坝、水下古隆起处滩坝、开阔浅湖滩坝和短轴三角洲侧缘滩坝等四种类型，进而建立了它们的相模式。这些滩坝随着盆地发育演化作规律性分布并与油气富集密切相关。
There are many kinds of depositional systems developed in Tertiary faulted-down lacustrine basins of East China, of which beach-bar reservoir has been stressed in recent years because of its close relation with hydrocarbon occurrence. The characteristics of the lithology, grain size,sedimentary structure and sequence, logging and seismic reflection, and distribution for both sandy beach-bar and biological grain beach - bar reservoirs have been demonstrated in faulted - down lacustrine basins of East China through comprehensive use of geological, logging and seismic reflection data. According to their location and sedimentary features, the beach-bar in Tertiary faulted - down lacustrine basins may be divided into four types, i. e. the beach - bar in lake shoreline corner, the beach-bar on subaqueous ancient uplift, the beach-bar by the short-axis delta, and open shallow lake beach - bar. Also, their sedimentary models have been developed. These beach -bars distribute regularly at the gentle slope of a lacustrine basin through the basin evolution. The practice for oil-gas exploration has indicated the beach-bar on subaqueous ancient uplift and open shallow lake beach - bar possess the ability to accumulate oil - gas, and have become importants target for hydrocarbon exploration.
There are many kinds of depositional systems developed in Tertiary faulted-down lacustrine basins of East China, of which beach-bar reservoir has been stressed in recent years because of its close relation with hydrocarbon occurrence. The characteristics of the lithology, grain size,sedimentary structure and sequence, logging and seismic reflection, and distribution for both sandy beach-bar and biological grain beach - bar reservoirs have been demonstrated in faulted - down lacustrine basins of East China through comprehensive use of geological, logging and seismic reflection data. According to their location and sedimentary features, the beach-bar in Tertiary faulted - down lacustrine basins may be divided into four types, i. e. the beach - bar in lake shoreline corner, the beach-bar on subaqueous ancient uplift, the beach-bar by the short-axis delta, and open shallow lake beach - bar. Also, their sedimentary models have been developed. These beach -bars distribute regularly at the gentle slope of a lacustrine basin through the basin evolution. The practice for oil-gas exploration has indicated the beach-bar on subaqueous ancient uplift and open shallow lake beach - bar possess the ability to accumulate oil - gas, and have become importants target for hydrocarbon exploration.
引文
［1］吴崇筠，1986，湖盆砂体类型，沉积学报，4（4）：1～27。［2］信荃麟等，1989，渤海湾盆地第三系断陷湖盆沉积体系与油气分布，石油大学学报，13（5）：11～17。
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