方法理论

海陆过渡相页岩储层合层开采数值模拟研究

  • 陈学忠 ,
  • 赵慧言 ,
  • 陈满 ,
  • 徐华卿 ,
  • 杨建英 ,
  • 杨晓敏 ,
  • 唐慧莹
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  • 1.四川长宁天然气开发有限责任公司,四川 成都 610051
    2.中国石油西南油气田分公司成都天然气化工总厂,四川 成都 610213
    3.西南石油大学油气藏地质及开发工程全国重点实验室,四川 成都 610500
陈学忠(1968—),男,硕士,高级工程师,主要从事油气田开发管理工作。地址:四川省成都市成华区猛追湾横街99号,邮政编码:610051。E-mail: cxzhong@petrochina.com.cn

收稿日期: 2023-08-29

  网络出版日期: 2024-07-10

基金资助

国家自然科学基金面上项目“井-射孔-缝协同密切割压裂三维非平面缝网竞争扩展机制研究”(52374043)

Numerical simulation of multi-layer co-production in marine-continental transitional shale reservoirs

  • Xuezhong CHEN ,
  • Huiyan ZHAO ,
  • Man CHEN ,
  • Huaqing XU ,
  • Jianying YANG ,
  • Xiaomin YANG ,
  • Huiying TANG
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  • 1. Sichuan Changning Natural Gas Development Co. Ltd., Chengdu, Sichuan 610051, China
    2. Chengdu Natural Gas Chemical Plant of PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610213, China
    3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received date: 2023-08-29

  Online published: 2024-07-10

摘要

由于沉积环境的不同,海陆过渡相页岩与海相页岩存在较大差异。基于鄂尔多斯盆地东缘海陆过渡相页岩储层的特点,建立了纵向多岩性叠置储层水平井产能数值模型,分析了不同岩性组合模式下的气井单段生产动态特征,研究了煤层渗透率、储层叠置关系等关键参数以及生产制度对生产特征的影响。研究结果表明:①富煤型页岩储层合层开采初期气水同产,采出气主要来自砂岩和页岩储层的游离气,采出水主要来自压裂液及煤层水。煤层的渗透率越高,合层开采的累计产气量越大,累计产水量也随之提升。②含煤叠置组合类型进行合层开采最理想的空间叠置顺序为页—砂—煤,在该叠置顺序下,煤层产水对合层开采干扰最小。③煤层产气量受应力敏感的影响最大。

本文引用格式

陈学忠 , 赵慧言 , 陈满 , 徐华卿 , 杨建英 , 杨晓敏 , 唐慧莹 . 海陆过渡相页岩储层合层开采数值模拟研究[J]. 油气藏评价与开发, 2024 , 14(3) : 382 -390 . DOI: 10.13809/j.cnki.cn32-1825/te.2024.03.008

Abstract

Distinct sedimentary environments lead to notable disparities between marine-continental transitional shale and purely marine shale. This study develops a numerical model to evaluate the productivity of horizontal wells in vertically multi-lithologic superimposed reservoirs, focusing on the marine-continental transitional shale reservoirs at the eastern margin of the Ordos Basin. The model analyses the dynamic characteristics of single-stage gas well production under various lithologic combination modes. It particularly investigates key parameters such as coal seam permeability, the superposition relationships of reservoirs, and the impact of the production system on output characteristics. The findings indicate that: ① In the early stages of combined extraction from coal-rich shale reservoirs, both gas and water are produced simultaneously. The gas primarily originates from the free gas in the sandstone and shale reservoirs, while the water is predominantly sourced from fracturing fluid and coal seam water. Notably, higher coal seam permeability correlates with increased cumulative gas and water production. ② The optimal spatial stacking sequence for combined layer mining in coal-bearing superimposed reservoirs is identified as page-sand-coal. This sequence minimizes the interference of coal seam water production on the overall mining process. ③ The production from coal seams exhibits significant stress sensitivity, impacting overall gas output.

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