金湖凹陷西斜坡阜二段储层参数分布特征

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金湖凹陷西斜坡阜二段(E1f2)储层沉积微相繁杂多样,分布规律复杂,导致储层参数变化快,规律难于把握。针对此问题,研究提出按沉积微相分类讨论储层参数分布规律的方法。金湖凹陷西斜坡阜二段第3亚段(E1f23)1—7小层沉积微相和砂体厚度的变化与展布特征不同,导致储层参数的分布特征差异明显,发育较多原生补给水道沉积的1—4小层比发育较多改造补给水道沉积的5—7小层的孔隙度、渗透率均要高。对研究区内发育的滨湖砂坝、滨湖砂滩、原生补给水道和改造补给水道微相进行分类研究,结果表明,滨湖砂坝和滨湖砂滩孔隙度、渗透率分布相对稳定,渗透率呈较明显的复合韵律分布模式;原生补给水道渗透率多呈正韵律分布模式;而改造补给水道渗透率多呈反韵律或复合韵律分布模式。储层物性平面上呈北东—南西向展布,其高值区主要分布于原生补给水道和砂坝沉积区,低值区则分布于改造补给水道和砂滩等沉积区。 The sedimentary microfacies of E1f2 reservoir in West slope of West Lake slope in Jinhu depression are various and complicated with complicated distribution rules, resulting in rapid changes of reservoir parameters and difficult to grasp the law. In response to this problem, we propose to discuss the distribution law of reservoir parameters according to sedimentary microfacies classification. The variation and distribution characteristics of sedimentary microfacies and sand bodies in the third sub-section E1f23 1-7 of Fu2 Member of West slope of Jinhu Depression are different, resulting in obvious differences in distribution characteristics of reservoir parameters and more primary recharge The 1-4 layers of waterway sediments have higher porosity and permeability than those of 5-7 layers that are more developed and recharged. The classification of the lacustrine sand bar, the lakeshore sandbank, the primary recharge channel and the alteration recharge channel in the study area are carried out. The results show that the porosity and permeability of the lakeshore sandbank and beach are relatively stable, The permeability shows a more obvious pattern of compound prosodic distribution. The permeation rate of primary supply channel mostly shows a positive rhythm distribution pattern. However, the permeability of rebuilt supply waterway is mostly reverse rhythm or complex prosodic distribution pattern. The physical properties of the reservoir show a north-east-south-west distribution. The high value areas are mainly distributed in the primary recharge channels and the sand bar deposition areas while the low value areas are located in the sedimentation areas such as the reforming supply waterways and sandy beaches.
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