岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 149–154.doi: 10.3969/j.issn.1673-8926.2015.05.024

• 油气地质 • 上一篇    下一篇

砂砾岩储层成因差异及其对储集物性的控制效应----以玛湖凹陷玛 2 井区下乌尔禾组为例

庞德新   

  1. 中国石油新疆油田分公司 低效油田开发公司,新疆 克拉玛依 834000
  • 出版日期:2015-09-26 发布日期:2015-09-26
  • 作者简介:庞德新( 1963- ),男,硕士,高级工程师,主要从事油气田开发方面的研究工作。 地址:( 834000 )新疆克拉玛依市新疆油田分公司低效油田开发公司。 E-mail : 110908111@qq.com
  • 基金资助:

    湖北省教育厅科学技术研究计划青年人才项目“库车坳陷白垩系碎屑岩储层流体 - 岩石相互作用的动力学机制剖析”(编号: B2013285 )资助

Sedimentary genesis of sand-conglomerate reservoir and its control effect on reservoir properties: A case study of the lower Urho Formation in Ma 2 well block of Mahu Depression

Pang Dexin   

  1.  Low Efficient Oilfield Development Company , PetroChina Xinjiang Oilfield Company , Karamay 834000 , Xinjiang , China
  • Online:2015-09-26 Published:2015-09-26

摘要:

根据岩心观察及测井和录井资料分析、铸体薄片微观分析和物性测试等,对玛湖凹陷玛 2 井区中二叠统下乌尔禾组砂砾岩储层成因类型进行了分析,认为研究层段储层岩性主要为砂砾岩、含砾砂岩、砂岩及泥质砂岩等。其中,将砂砾岩按成因的不同可进一步划分为牵引流砂砾岩及重力流砂砾岩两类,它们在成熟度、泥质杂基含量、孔隙类型等诸多方面均具有明显的差异,继而造成储集物性的巨大差异。该区砂砾岩的孔隙类型以次生孔隙为主,总体属于低孔、低渗储层;沉积环境(微相)对目的层砂砾岩储层的储集物性具有明显的控制效应;水下分流河道微相发育的牵引流砂砾岩储集物性最好,扇面河道微相次之,泥石流及碎屑流微相内形成的重力流砂砾岩储集物性最差,甚至可形成物性隔夹层。

关键词: 硅岩, 地球化学, 成因, 古生界, 下扬子地区

Abstract:

According to core observation, well logging, logging, casting thin sections and analysis assay data, this paper studied the sand-conglomerate reservoir characteristics of the lower Urho Formation in Ma 2 well block of Mahu Depression. The reservoir lithology could be divided into sand-conglomerate, conglomeratic sandstone, sandstone and shaly sandstones and so on. The sand-conglomerate could be further divided into traction current sand-conglomerate and gravity current sand-conglomerate by the genesis, and they have many obvious differences on the aspects of maturity, muddy matrix content, pore type and so on, which causes the huge differences of reservoir properties. The pore type of sand-conglomerate reservoir mainly is secondary porosity, belonging to low porosity and low permeability reservoir. Sedimentary environment(microfacies) has very obvious control effect on sand-conglomerate reservoir properties, among them, traction current sand-conglomerate of underwater distributary channel microfacies has the best reservoir properties, followed by stream channel microfacies, and the gravity current sand-conglomerate of debris flow and underwater debris flow microfacies has the poorest reservoir properties, which can form property interbeds.

Key words: siliceous rock, geochemical characteristics, genesis, Palaeozoic, Lower Yangtze area

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