研究论文

鄂尔多斯盆地东南部上古生界地层压力与天然气分布

  • 王伟力 ,
  • 高海仁
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  • 1. 长安大学地球科学与资源学院, 西安710054;
    2. 延长石油油气勘探公司, 延安716000
王伟力,博士研究生,研究方向为储层与成藏地质,电子信箱:wileyz@qq.com

收稿日期: 2014-08-05

  修回日期: 2014-09-23

  网络出版日期: 2015-03-03

基金资助

中央高校基本科研专项(2013G5270008)

Formation pressure and distribution of natural gas in the Upper Paleozoic, southeastern Ordos Basin

  • WANG Weili ,
  • GAO Hairen
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  • 1. College of Earth Science and Resources, Chang'an University, Xi'an 710054, China;
    2. Oil and Gas Exploration Company, Yanchang Petroleum (Group) Co., Ltd., Yan'an 716000, China

Received date: 2014-08-05

  Revised date: 2014-09-23

  Online published: 2015-03-03

摘要

鄂尔多斯盆地东南部上古生界近几年勘探成果备受瞩目,但针对本地区地层压力及与天然气分布关系的研究较少。本文通过293 口井实测的压力数据和154 口井的测井数据分析发现,二叠系上石盒子组—太原组泥岩普遍存在“欠压实”特征,4 个目标层位在压力剖面上分异明显,可划分为石炭系本溪组常压系统和二叠系山2 段—盒8 段负压系统。现今地层压力分布总体上具有东北高西南低的特点,二叠系压力分布与沉积相分布具有较好的一致性。“欠压实”泥岩层控制气藏纵向上的分布。二叠系气藏主要分布在负压地层中的“低压”部位,而石炭系本溪组气藏则主要分布在常压地层中的“高压”区域。发现地层压力与气藏分布关系对于本地区天然气勘探其有重要指导意义。

本文引用格式

王伟力 , 高海仁 . 鄂尔多斯盆地东南部上古生界地层压力与天然气分布[J]. 科技导报, 2015 , 33(3) : 37 -42 . DOI: 10.3981/j.issn.1000-7857.2015.03.005

Abstract

Exploration achievements in the Southeastern Ordos Basin have attracted tremendous attention in recent years. However, few researches about distribution of formation pressure and relation with natural gas have been carried out in this area. The measured formation pressure data of 293 wells and well log data of 154 wells are analyzed in this paper, and the results show that the mudstones from Upper Shihezi Formation to Taiyuan Formation of Permian are mostly undercompacted, and that the variations with depth of formation pressure in 4 target layers have obvious differentiation, which can be divided into negative pressure system of Permian and normal pressure system of Carboniferous in further. The distribution of current formation pressure is high in the east and north and low in the west and south, the relation between sedimentary facies and distribution of formation pressure in Permian are in a good consistency. Gas reservoirs on vertical zonation are controlled by the under compacted mudstone layers, and also can be found in the "low pressure" areas of negative pressure stratum in Permian and "high pressure" regions of normal pressure in Carboniferous. The discovery of the relation between formation pressure and gas reservoirs is significant for the following natural gas exploration in this area.

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