石油勘探与开发 >

2017 , Vol. 44 >Issue 2: 196 - 204

DOI: https://doi.org/10.11698/PED.2017.02.03

油气勘探

柴达木盆地西部地区致密油地质特征及勘探领域

  • 刘占国 ,
  • 朱超 ,
  • 李森明 ,
  • 薛建勤 ,
  • 宫清顺 ,
  • 王艳清 ,
  • 王鹏 ,
  • 夏志远 ,
  • 宋光永
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  • 1. 中国石油杭州地质研究院,杭州 310023;
    2. 中国石油青海油田公司勘探开发研究院,甘肃敦煌 736202
刘占国（1980-）,男,满族,河北承德人,中国石油杭州地质研究院高级工程师,主要从事沉积储集层综合研究。地址：浙江省杭州市西湖区西溪路920号,杭州地质研究院,邮政编码：310023。E-mail：liuzg_hz@petrochina.com.cn

收稿日期: 2016-06-24

  修回日期: 2017-02-08

  网络出版日期: 2017-05-22

基金资助

中国石油科技重大专项（2016E-0101; 2016B-0303）

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Geological features and exploration fields of tight oil in the Cenozoic of western Qaidam Basin, NW China

  • LIU Zhanguo ,
  • ZHU Chao ,
  • LI Senming ,
  • XUE Jianqin ,
  • GONG Qingshun ,
  • WANG Yanqing ,
  • WANG Peng ,
  • XIA Zhiyuan ,
  • SONG Guangyong
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  • 1. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China;
    2. Exploration and Development Institute of PetroChina Qinghai Oil Field Company, Dunhuang 736202, China

Received date: 2016-06-24

  Revised date: 2017-02-08

  Online published: 2017-05-22

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摘要

应用大量钻井和实验分析资料,对柴达木盆地西部地区（简称柴西地区）致密油沉积环境、源储及配置组合地质特征进行综合分析,预测出四大致密油勘探领域。柴西地区自古近纪以来受青藏高原持续挤压隆升作用影响,沉积环境具三大显著特征：①继承性的古斜坡和凹隆相间的古地貌;②相对湿润到干旱频繁交替变化的古气候;③高频震荡升降演化的湖平面和古盐度。在其控制下,古近纪末期至新近纪早期发育了两套规模大、生烃效率高的主力烃源岩,发育了碎屑岩和碳酸盐岩两类规模致密储集层,形成了源储间互、源储共生和源储侧交3种有利致密油源储组合类型。评价预测结果揭示柴西地区存在咸化湖泊碳酸盐岩、浅湖滩坝砂岩、三角洲前缘砂岩和深湖重力流砂岩4类致密油储集层类型及勘探领域,时空分布具层位集中、规律性强、有利面积大等特点,其中咸化湖泊碳酸盐岩和浅湖滩坝砂岩致密油勘探潜力最大。图6表2参21

关键词： 致密油; 地质特征; 勘探领域; 柴达木盆地; 致密储集层

本文引用格式

刘占国 , 朱超 , 李森明 , 薛建勤 , 宫清顺 , 王艳清 , 王鹏 , 夏志远 , 宋光永 . 柴达木盆地西部地区致密油地质特征及勘探领域[J]. 石油勘探与开发, 2017 , 44(2) : 196 -204 . DOI: 10.11698/PED.2017.02.03

Abstract

Using a large amount of drilling and experimental analysis data, this paper evaluates four potential fields of tight oil exploration in western Qaidam Basin from comprehensive analysis of geological conditions such as sedimentary environments, source rock evaluations, reservoir characteristics, and source-reservoir relationships. Influenced by continuous uplift of Tibet Plateau since Paleogene, the sedimentary environment of the western Qaidam Basin exibits three characteristics: (1) a paleo-topographic configuration consisted of inherited slopes, depressions and paleohighs; (2) frequent alternation of relative humid and arid paleoclimate; and (3) oscillation of salinity and level of the paleo-lake water. Preferential paleo-environment resulted in two sets of large-scale source rocks with high efficiency and two types of large-scale tight reservoir rocks (siliclastic and carbonate), deposited during the late Paleogene to early Neogene. The above source and reservoir rocks form favorable spatial relationships which can be classified into three categories: symbiotic, inter and lateral. Based on sedimentary environments and reservoir types, tight oil resource in western Qaidam Basin can be divided into four types, corresponding to four exploration fields: salty lacustrine carbonate tight oil, shallow lake beach-bar sandstone tight oil, delta-front-sandstone tight oil and deep lake gravity-flow-sandstone tight oil. The temporal and spatial distribution of tight oil has characteristics of layer concentration, strong regularity and large favorable area, in which the saline lacustrine carbonate and shallow lake beach-bar sandstone tight oil are the best exploration targets in the western Qaidam Basin.

Key words： tight oil; geological features; exploration fields; Qaidam Basin; tight reservoir

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