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现代地质 ›› 2011, Vol. 25 ›› Issue (5): 902-908.

• 石油地质学 • 上一篇    下一篇

鄂尔多斯盆地姬塬地区长2油层组石油富集规律及其差异性

 田建锋1, 2, 3,  刘池洋1, 2, 梁晓伟4   

  1. 1西北大学 大陆动力学国家重点实验室,陕西 西安710069;2西北大学 含油气盆地研究所,陕西 西安710069;
    3西安石油大学 油气资源学院,陕西 西安710065;4中国石油长庆油田分公司 勘探开发研究院,陕西 西安710021
  • 收稿日期:2011-02-27 修回日期:2011-05-30 出版日期:2011-10-26 发布日期:2011-11-03
  • 作者简介:田建锋,男,讲师,博士研究生,1980年出生,沉积学专业,主要从事碎屑岩储层地质学研究和教学工作。 Email:tjf21991@163.com。
  • 基金资助:

    国家重点基础研究发展计划“973”项目(2003CB214607);国家自然科学基金项目(40372096)。

Oil Enrichment Laws and Differentia of Chang 2 Formation in Jiyuan Area, Ordos Basin

 TIAN  Jian-Feng-1, 2 , 3 ,   Liu-Che-Xiang-1, 2 , LIANG  Xiao-Wei-4   

  1. 1State Key Laboratory of Continental Dynamics, Northwest University, Xian,Shaanxi 710069, China; 2Institute of Oil and Gas, Northwest
    University, Xian, Shaanxi710069,  China; 3College of Oil & Gas Resources, Xian Shiyou University, Xian, Shaanxi710065, China;
    4Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xian, Shaanxi710021, China
  • Received:2011-02-27 Revised:2011-05-30 Online:2011-10-26 Published:2011-11-03

摘要:

通过分析鄂尔多斯盆地姬塬地区油层分布与主要成藏地质要素之间的关系,发现西倾单斜背景是该区构造岩性圈闭形成的基础,鼻隆构造控制石油的分布,水下分流河道砂体是主要储集体,分流间湾泥岩是油藏上倾方向的遮挡和上部封盖条件,成岩作用是保证砂体储集能力的关键,长2下部大套连通砂体具有汇聚石油的“倒置漏斗”作用。但各个地质要素对不同小层的影响程度存在差异,对石油富集影响最强的因素称为油气富集的关键因素,它也是油气成藏条件中最差的那个因素,且在中期沉积旋回的不同部位关键因素不同。关键因素的差异决定了油气富集规律的差异,姬塬地区长211和长212油气富集的关键因素是水下分流河道砂体的展布,其油层分布具有南北成带的特点;长222和长23油气富集的关键因素是泥岩遮盖能力,其不均一性导致油层分布零星分散,长213和长221油气富集的关键因素是鼻隆构造形态,它使油层分布呈东西成串状。

关键词: 姬塬地区, 石油富集规律, 油气富集关键因素, 鼻隆构造, 鄂尔多斯盆地

Abstract:

The relationship between oil layer distributions and key reservoirforming factors indicates that the westward monocline is the foundation of structurallithologic trap type; Nose uplift structure determines oil distribution; Distributary channel sand body is the main reservoirs; Interchannel mudstone is the barrier and cap of oil accumulation; Diagenesis is a key point for storage capability of sand bodies; The massive interconnected sandstone on the bottom of Chang 2 formation is like a large inverted hopper that can accumulate oil for the upper entrapment. The influence degree of each geologic element is defferent for each sublayer. The strongest element is called key element of hydrocarbon enrichment. The key element is also the poorest element and changes with the place of middle sedimentary cycle.The key elements of hydrocarbon enrichment of Chang 211 and Chang 212, Chang 222 and Chang 23, Chang 213 and Chang 221 are the sand body distribution of distributary channel, mudstone barrier or cap and the shape of noseshaped uplift, respectively, forming oil distribution in a row, in disperse and as strings, respectively.

Key words: Jiyuan area, enrichment law of oil, key element of hydrocarbon enrichment, noseshaped uplift, Ordos Basin