新疆石油地质

新疆石油地质 ›› 2002, Vol. 23 ›› Issue (4): 283-285.

• 油气勘探 • 上一篇    下一篇

陆梁隆起白垩系底部不整合面特征与油气运聚

陈中红1, 查明1, 吴孔友1, 张年富2, 张越迁2   

  1. 1.石油大学 地球资源与信息学院,山东 东营 257061;
    2.中国石油 新疆油田分公司 勘探开发研究院,新疆 克拉玛依 834000
  • 收稿日期:2001-11-12 出版日期:2002-08-01 发布日期:2020-08-10
  • 作者简介:陈中红(1976-), 男,安徽怀宁人,硕士,石油地质。联系电话:0546-8393483

Relationship between Hydrocarbon Migration-Accumulation and Unconformity at Cretaceous Bottom of Luliang Up-lift in Junggar Basin

CHEN Zhong-hong, ZHA Ming, WU Kong-you, ZHANG Nian-fu, ZHANG Yue-qian   

  • Received:2001-11-12 Online:2002-08-01 Published:2020-08-10
  • About author:CHEN Zhong-hong (1976-), Male, Master, Petroleum Geology, The Earth Resource and Information Institute,University of Petroleum, Dongying, Shandong 257061, China

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摘要： 根据白垩系底部不整合面的成因机制和地震反射特征,将研究区的不整合分为四种类型,不同类型的不整合对研究区油气运聚作用也各不相同。白垩系底部不整合面上下地层的岩性配置可分为五种类型:Ⅰ型,不整合面之上为砂砾,其下依次为泥岩、砂岩; Ⅱ 型,不整合面之上为砂岩,其下依次为泥岩、砂岩; Ⅲ 型,不整合面之上为砂砾岩,其下依次为泥岩、砂砾岩;IV型,不整合面之上为砂岩,其下依次为泥岩、砂砾岩; V型,不整合面之上为砂砾岩,其下依次为泥岩、砂岩、砂砾岩。其中, Ⅰ型、Ⅱ型对本区油气运聚最为有利,白垩系底部不整合与断层共同构成了良好的输导通道,不整合之下的淋滤带是较好的运移通道,在其上风化粘土层的遮挡下,油气可有效地横向运移,喜马拉雅运动后期产生的正断层切割不整合底部的砾岩及上覆大套砂岩,向.上快速输导油气。白垩系底部不整合封堵油气成藏有三种模式,即粘土层封堵、淋滤带半风化泥岩封堵和淋滤带薄层泥岩封堵。

关键词: 准噶尔盆地, 陆梁隆起, 不整合面, 岩性配置, 淋滤带, 粘土层, 底砾岩

Abstract: According to origin mechanism and seismic reflectance on unconformity at Cretaceous bottom, unconformity in the studied area is divided into four types, each of which has different effects on the hydro- carbon migration and accumulation.Above and below the unconformity, there exist five types of lithology combinations: TypeⅠincludes glutenite above it, mudstone and sandstone below it; Type Ⅱ sandstone above it, mudstone and sandstone below it; Type Ⅲ glutenite above it, mudstone and glutenite below it; Type IV sand- stone above it, mudstone and glutenitebelow it; Type V grit above it, mudstone, sandstone and glutenitebelow it.Among them, Type Ⅰ and type Ⅱ are the most favorable to oil and gas migration and accumulation in this area, for this unconformity and fault composed of channels of good conductivity, the leached zone below it acts as a better passage for petroleum migration, oil and gas can be migrated laterally and effectively by the weathered argillic horizon as a barrier above it.While the basal conglomerate and overburden thick sandstones cut by normal faults formed in late period of Himalayan movement have enabled oil and gas to migrate upward rapidly.The hydrocarbon reservoirs at Cretaceous bottom unconformity could be shaped by three styles of barriers such as argillic horizon barrier, leached zone half-weathered mudstone barrier and thin layer barrier.

Key words: Junggar basin, Luliang uplift, unconformity, lithology combination, leached zone, argillic horizon, basal conglomerate

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