西湖凹陷平湖组低渗储层特征及“甜点”主控因素分析
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TE122.2

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国家科技重大专项(2016ZX05024002)


Low permeability reservoir characteristics and controlling factors of “sweet points” of the Eocene Pinghu Formation in Xihu sag, East China Sea Shelf Basin
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    摘要:

    西湖凹陷平湖斜坡始新统平湖组油气储量大,是西湖凹陷主要勘探层系之一。但平湖组埋深大,储层渗透率低、非均质性强,低渗透背景下“甜点”储层的发育机理和分布规律不明,造成储量级别难以提升。复杂多样的成岩作用是造成这一问题的关键因素。对平湖组储层平面分区、纵向分段、空间分微相进行了精细评价,结合成岩作用研究,探讨深部储层低渗和非均质性的形成机理,明确储层差异及影响因素。研究揭示,沉积微相和次生溶蚀是影响深部储层物性分布的重要因素,沉积微相与以胶结率和溶蚀量为主构成的成岩相共同控制了平湖组储层物性分级;潮道、砂坪、水下分流河道、河口坝相中的弱胶结强溶蚀相、弱胶结中溶蚀以及中弱胶结中溶蚀成岩相储层质量最好。指出平湖斜坡孔雀亭西、宝武亭平四-平五段潮道砂体为储层“甜点”,孔雀亭东、团结亭平二-平三段三角洲水下分流河道砂体为储层“甜点”。研究成果为有利储层分布预测奠定了基础,为油气勘探开发指明了方向。

    Abstract:

    Reservoirs of the Eocene Pinghu Formation in Xihu sag was deeply buried with low permeability and high heterogeneity. Genesis and distribution of the “sweet points” in such low permeability reservoir were still unclear, which made it hard to increase the reserves in this area. Complicated diagenesis is the key factor to solve this problem. In order to study the diagenesis and analyze the genesis of the low permeability reservoirs in this area, reservoirs in Pinghu Formation in different areas, different formation, and different facies were compared in detail. Reservoir quality differences, affecting factors, and genesis mechanism of high quality low permeability reservoirs were clarified. It is found that secondary dissolution and microfacies are significant factors affecting the reservoir distribution. Diagenisis including cement and dissolution and facies including tidal flat and delta make the reservoir quality divide into different levels. Weak cementation with strong dissolution, weak cementation with medium dissolution, and medium cementation with medium dissolution facies in tide channel, sand flat, distributary channel, and mouth bar developed high quality reservoirs. Tide channel sand bodies in Ping-4 and Ping-5 section in Kongqueting west and Baowuting are reservoir sweet points. Distributary channel sand bodies in Ping-2 and Ping-3 section in Kongqueting east and Tuanjieting are other reservoir sweet points. Study achievements are bases for the prediction of favorable reservoir distribution and are directions for hydrocarbon exploration and development.

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谢晓军,熊连桥,陈莹,等. 西湖凹陷平湖组低渗储层特征及“甜点”主控因素分析[J]. 科学技术与工程, 2021, 21(30): 12890-12900.
Xie Xiaojun, Xiong Lianqiao, Chen Yin, et al. Low permeability reservoir characteristics and controlling factors of “sweet points” of the Eocene Pinghu Formation in Xihu sag, East China Sea Shelf Basin[J]. Science Technology and Engineering,2021,21(30):12890-12900.

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  • 收稿日期:2021-06-15
  • 最后修改日期:2021-09-24
  • 录用日期:2021-07-30
  • 在线发布日期: 2021-11-10
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