新疆石油地质

新疆石油地质 ›› 2010, Vol. 31 ›› Issue (2): 154-157.

• 油气勘探 • 上一篇    下一篇

砂泥岩薄互层低阻油层地质成因——以珠江口盆地A 油藏M1 油组为例

廖明光1, 苏崇华2, 唐洪1, 谈德辉1, 姜崴3, 陈小强3   

  1. 1.西南石油大学,成都 610500;
    2.中海石油 有限公司 湛江分公司 研究院,广东 湛江 524057;
    3.中国石化 西南油气田分公司 研究院,成都 610051
  • 收稿日期:2009-10-23 修回日期:2009-12-28 发布日期:2020-09-17
  • 作者简介:廖明光(1967-),男,四川绵竹人,副教授,博士,油气田开发,(Tel)028-83035058(E-mail)liaomg@swpu.edu.cn.
  • 基金资助:
    中海油国家重大科技专项(2008ZX05030—002);四川省重点学科“矿产普查与勘探”建设项目(SDZ0414)

Geological Genesis of Low Resistivity Formation with Thin Sand-Shale Interlayer—An example from M1 oil measure of A reservoir in Pearl River Mouth basin

LIAO Ming-guang1, SU Chong-hua2, TANG Hong1, TAN De-hui1, JIANG Wei3, CHEN Xiao-qiang3   

  1. 1. Southwest Petroleum Univerisity, Chengdu, Sichuan 610500, China;
    2. Research Institute of Exploration and Development, Zhanjiang Branch, CNOOC, Zhanjiang, Guangdong 524057, China;
    3. Research Institute of Exploration and Development, Southwest Oilfield Company, Sinopec, Chengdu, Sichuan 610051, China
  • Received:2009-10-23 Revised:2009-12-28 Published:2020-09-17

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摘要： 珠江口盆地A 油藏M1油组为高孔低渗低阻油藏,为了查明造成油层低电阻率的主要原因,从储集层岩石粒度、泥质含量及粘土矿物类型和分布形式、孔隙结构特征、导电矿物含量、砂泥岩薄互层发育状况等方面进行分析,并与高阻层段M2 油组进行对比。形成M1 油组低电阻率的主要原因是:储集层细颗粒含量高,泥质含量高,细微孔喉体积百分数高,造成储集层束缚水饱和度高,增强了油层的导电性能;粘土矿物以伊蒙混层和高岭石为主,呈薄膜状、絮状、分散状分布,增强了储集层的附加导电能力;砂泥岩薄互层的发育使本身低阻的油层受围岩低电阻率的影响而变得更低。导电矿物和地层水矿化度虽对储集层电阻率降低有一定影响,但不是主要因素。

关键词: 珠江口盆地, 低电阻率油层, 束缚水饱和度, 孔隙结构, 粘土矿物, 附加导电性, 薄互层, 低阻成因

Abstract: M1 oil measure of A reservoir in Pearl River Mouth basin is characterized by high porosity, low permeability and low resistivity. In order to examine its main control factor of low resistivity, this paper conducts the analyses of the grain size distribution, shale content, clay mineral type and distributive form, pore structural feature, conductive mineral content, thin sand-shale interlayer development status, with comparison with M2 oil measure of high resistivity. It is concluded that there are three factors for it: the reservoir is of high fine-particle content, high shale content, high percentage of fine pore throat volume, which result in its high irreducible water saturation and enhance its conductive property; its clay mineral is dominated by illite-montmorillonite mixed layer and kaolinite, showing film-like, flocculation-like and dispersion-like distribution, enhancing its additional conductivity; the development of thin sand-shale interlayer allows the low-resistivity formation of its own to become much lower by the effect of surrounding rocks with low resistivity. Also, the conductive minerals and the salinity of formation water have some effects on reducing resistivity of the reservoir, but they are not main factors for it.

Key words: low-resistivity reservoir, irreducible water saturation, pore structure, clay mineral, additional conductivity, thin interlayer, origin, genesis

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