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综合运用岩心观察、铸体薄片分析、岩石物性测试、压汞测试以及试油结果分析等方法,对车镇北带古近系中深层储层基本特征进行研究,提出依据地质历史时期储层古压力和古流体的演化特征来探讨中深层优质储层形成机理.结果表明:车镇北带古近系中深层储层塑性岩屑含量高,压实强烈,储层物性差,主要为超低孔-特低超低渗储层,储集空间类型主要为次生孔隙和超压裂缝,也可见两者组成的复合型储集空间.中深层优质储层形成机理主要有早期异常高压、早期油气充注和早期有机酸溶蚀作用,扇根砾岩原始物性差,以压实作用和灰泥重结晶作用为主,储层内部流体活动困难,溶解作用微弱物性差,储层类型为Ⅳ类,且随着埋深增加,Ⅳ类储层展布范围增加;扇中辫状水道储层原始物性好,抗压实能力强,早期有机酸可以大量进入储层产生溶蚀孔隙,在早期异常压力的保护下得到有效保存,并且早期油气优先充注储层物性好的扇中辫状水道储层,抑制后期胶结作用,中深层仍发育大量储集空间,储层类型主要为Ⅰ类、Ⅱ类和Ⅲ类,随埋深增加,Ⅰ类和Ⅱ类储层展布范围减小,Ⅲ类储层展布范围先减小后增加;扇缘薄层砂储层处于构造低部位,难以形成有效的早期油气充注,成岩作用以强烈胶结作用为主,储层物性差,储层类型为Ⅳ类.
Based on the comprehensive analysis of core observation, thin slab analysis, petrophysics test, mercury intrusion test and analysis of test oil results, the basic characteristics of Middle-deep reservoirs in Paleogene of Chebeizhen belt are studied. Based on the analysis of reservoir paleo-history Pressure and paleo-fluid evolution of the middle-deep high-quality reservoirs.The results show that the content of plastic lithofacies in the middle-deep reservoirs of the Paleogene in Chebei Zhenbei area is high, the compaction is strong and the reservoir properties are poor, The pore-ultra-low permeability reservoir is characterized by secondary pores and overpressure fractures, as well as the composite reservoir space formed by the two types of reservoirs.The formation mechanism of high-quality reservoirs in the middle and deep layers are mainly early anomalous high pressure, Hydrocarbon charging and early organic acid dissolution resulted in poor initial physical properties of fan conglomerate, which were mainly compaction and stucco recrystallization. Fluid activity was difficult in reservoirs with weak dissolving effect. The reservoir type was Ⅳ , And with the increase of burial depth, the range of Ⅳ type reservoir is increased. The fan-shaped braided channel reservoir has good original properties and strong anti-compaction ability. Early organic acids can enter into reservoirs in large quantities to produce dissolved pores. At early abnormal pressure Paul The reservoirs are effectively preserved and early oil and gas are preferentially infused into fan-shaped braided aquifer reservoirs with good reservoir properties to suppress post-cementation. Large reservoir space is still developed in middle and deep reservoirs. The types of reservoirs are Class I, Class II and With the increase of burial depth, Class Ⅲ and Ⅱ reservoirs show a lower distribution range and a lower range of type Ⅲ reservoirs, and the range of distribution of type Ⅲ reservoirs first decreases and then increases. In the lower part of the fan-edge thin-layer sand reservoirs, it is difficult to form an effective Early hydrocarbon filling and diagenesis dominated by strong cementation with poor reservoir properties and type IV reservoirs.