油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (2): 207-215.doi: 10.13809/j.cnki.cn32-1825/te.2024.02.006

• 火山岩气藏 • 上一篇    下一篇

中基性火山岩多种叠前反演算法对比、优选及应用——以查干花地区火石岭组为例

李瑞磊(),曹磊(),樊薛沛,冯晓辉,李宁   

  1. 中国石化东北油气分公司,吉林 长春 130062
  • 收稿日期:2023-12-25 发布日期:2024-05-07 出版日期:2024-04-26
  • 通讯作者: 曹磊 E-mail:lirl.dbsj@sinopec.com;caol.dbsj@sinopec.com
  • 作者简介:李瑞磊(1970—),男,博士,教授级高级工程师,从事石油地质综合研究工作。地址:吉林省长春市西安大路4936号中国石化东北油气分公司,邮政编码:130062。E-mail: lirl.dbsj@sinopec.com
  • 基金资助:
    中国石化科技项目“松南断陷火山岩气藏一体化技术研究与应用”(P21104)

Comparison, optimization and application of multiple prestack inversion algorithm for intermediate basic volcanic reservoirs: A case study of Huoshiling Formation in Chaganhua area

LI Ruilei(),CAO Lei(),FAN Xuepei,FENG Xiaohui,LI Ning   

  1. Sinopec Northeast Oil & Gas Company, Changchun, Jilin 130062, China
  • Received:2023-12-25 Online:2024-05-07 Published:2024-04-26
  • Contact: CAO Lei E-mail:lirl.dbsj@sinopec.com;caol.dbsj@sinopec.com

摘要:

目前应用最广泛的叠前同时反演算法是基于各项同性水平介质的Zoeppritz方程近似表达式,但对于具有岩性横向变化快且纵向多期叠置特点的中基性火山岩储层,凝灰岩和沉凝灰岩具有相近的测井和地球物理响应,叠前同时反演在火山岩岩性、物性的区分上存在一定的局限性。通过褶积模型正演定性分析火山岩储层地震响应特征,井上岩石物理分析火山岩储层岩性、物性敏感参数,通过模型试算和实际数据计算对比分析6种Zoeppritz方程近似的二项式和三项式叠前反演算法在该地区的适用性,从而优选出SMITH & GIDLOW, FATTI近似算法,输入纵波阻抗、横波阻抗和密度的反射系数进行叠前反演,应用叠前纵波阻抗反演结果对该地区凝灰岩进行预测,应用叠前密度反演结果对有效储层物性进行预测。支撑部署1口评价井,预测符合率为76.0%,部署1口水平井,预测符合率为84.6%,均获得工业气流。

关键词: 叠前反演, 火山岩, 地震响应, 岩石物理, 物性预测

Abstract:

Currently, the most widely used pre-stack simultaneous inversion algorithm is based on the Zoeppritz equation approximation of isotropic horizontal media. This method, however, encounters challenges in medium-basic volcanic reservoirs characterized by rapid lateral lithological changes and vertical multi-period stacking. In such environments, tuffs and sedimentary tuffs exhibit similar logging and geophysical responses, complicating the distinction of lithology and physical properties of volcanic rocks through pre-stack simultaneous inversion. To address these challenges, qualitative analyses were conducted on the seismic response characteristics of volcanic reservoirs using convolutional model forward modeling. Additionally, well rock physics was employed for physical analyses of lithology and sensitive parameters pertinent to volcanic reservoirs. Comparative analyses of six binomial and trinomial pre-stack inverse algorithms, aimed at approximating the Zoeppritz equation in the specific area, were conducted through model calculations and actual data assessments. Based on these comprehensive analyses, the approximate algorithms developed by SMITH & GIDLOW and FATTI were identified as preferable choices. These algorithms use the reflection coefficients of P-wave impedance, S-wave impedance, and density as inputs for pre-stack inversion. The inversion results for P-wave impedance were utilized to predict the presence of local tuff, while the inversion outcomes for density were employed to ascertain the effective reservoir physical properties. The efficacy of this approach was validated through the deployment of an evaluation well and a horizontal well, which yielded predicted compliance rates of 76.0% and 84.6%, respectively.

Key words: pre-stack inversion, volcanic rock, seismic response, rock petrophysic, petrophysical property prediction

中图分类号: 

  • TE122