渤中凹陷西北緣東三段低滲透儲(chǔ)層特征及控制因素
[Abstract]:Typical fan delta sandy gravel reservoirs are developed in the eastern third member of the northwestern margin of Bozhong Sag, but the diagenetic evolution and controlling factors of the reservoirs are not well understood. The diagenetic evolution of sandstone fan delta reservoir and its influence on reservoir physical properties of the third member of the east formation are studied by using the core, wall core, casting thin section, scanning electron microscope, physical properties and other data, combined with burial history and oil and gas filling history. The results show that the reservoir types of the third member in the east of the study area are mainly supported conglomerate by complex base, conglomerate supported by grain, conglomerate sandstone, meso-coarse sandstone, fine sandstone, feldspathic sandstone and lithic feldspathic sandstone. Volcanic rocks are the main cuttings, metamorphic rocks followed by metamorphic rocks. The reservoir in this area is characterized by typical low permeability. The reservoir space is mainly composed of dissolved intergranular pores, followed by primary intergranular pores. The diagenetic environment of the reservoir has undergone the change of neutral acid (atmospheric fresh water leaching) alkalinity. The continuous compaction after atmospheric fresh water leaching and the cementation of carbonate and clay in alkaline conditions are the fundamental reasons for the formation of low permeability. The leaching of fresh water in the atmosphere and the dissolution in acidic environment are the main reasons for the formation of secondary pores. The continuous filling of oil and gas since 7 Ma is beneficial to the preservation of reservoir pores. The alkaline fluid environment formed by organic acid decarboxylation since 1. 5 Ma is easy to form carbonate cementation and Illite filling, which is the ultimate cause of formation of low permeability reservoir.
【作者單位】: 中海石油(中國(guó))有限公司天津分公司渤海石油研究院;
【基金】:“十三五”國(guó)家重大科技專項(xiàng)課題“渤海海域勘探新領(lǐng)域及關(guān)鍵技術(shù)研究”(編號(hào):2016ZX05024003)資助
【分類號(hào)】:P618.13
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